From 70d9ab25f3e20f8301ab353ce45dd543e61087db Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@koston.org>
Date: Fri, 5 Jun 2026 17:57:42 -0500
Subject: [PATCH] [tests] Fail component test merge on conflicting duplicate
 IDs (#16795)

---
 .github/workflows/ci.yml                      |   1 +
 script/ci_check_duplicate_test_ids.py         | 122 ++++++++++++++++++
 script/merge_component_configs.py             |  48 ++++++-
 tests/components/adc/test.bk72xx-ard.yaml     |   2 +-
 tests/components/adc/test.esp32-c2-idf.yaml   |   2 +-
 tests/components/adc/test.esp32-c3-idf.yaml   |   2 +-
 tests/components/adc/test.esp32-idf.yaml      |   2 +-
 tests/components/adc/test.esp32-p4-idf.yaml   |   2 +-
 tests/components/adc/test.esp32-s2-idf.yaml   |   2 +-
 tests/components/adc/test.esp32-s3-idf.yaml   |   2 +-
 tests/components/adc/test.esp8266-ard.yaml    |   2 +-
 tests/components/adc/test.ln882x-ard.yaml     |   2 +-
 tests/components/adc/test.rp2040-ard.yaml     |   2 +-
 .../components/adc/test.rp2040-pico2-ard.yaml |   2 +-
 .../alarm_control_panel/common.yaml           |   6 +-
 .../components/animation/test.esp32-idf.yaml  |   2 +-
 .../animation/test.esp8266-ard.yaml           |   2 +-
 .../components/animation/test.rp2040-ard.yaml |   2 +-
 tests/components/axs15231/common.yaml         |   4 +-
 .../components/axs15231/test.esp8266-ard.yaml |   4 +-
 tests/components/bang_bang/common.yaml        |  12 +-
 tests/components/binary_sensor/common.yaml    |   6 +-
 .../components/binary_sensor_map/common.yaml  |  24 ++--
 tests/components/ble_client/common.yaml       |   4 +-
 tests/components/canbus/common.yaml           |   6 +-
 tests/components/climate_ir_lg/common.yaml    |   4 +-
 .../components/color_temperature/common.yaml  |   8 +-
 tests/components/copy/common.yaml             |   8 +-
 tests/components/current_based/common.yaml    |   6 +-
 tests/components/cwww/common.yaml             |   4 +-
 tests/components/cwww/test.esp32-idf.yaml     |   4 +-
 tests/components/cwww/test.esp8266-ard.yaml   |   4 +-
 tests/components/cwww/test.rp2040-ard.yaml    |   4 +-
 tests/components/display/common.yaml          |   2 +-
 tests/components/duty_time/common.yaml        |   4 +-
 tests/components/e131/test.rp2040-ard.yaml    |   2 +-
 tests/components/ektf2232/common.yaml         |   4 +-
 tests/components/endstop/common.yaml          |  12 +-
 tests/components/esp32_can/common.yaml        |   2 +-
 .../esp32_can/test.esp32-c6-idf.yaml          |   6 +-
 tests/components/espnow/common.yaml           |   6 +-
 .../components/fastled_clockless/common.yaml  |   6 +-
 tests/components/fastled_spi/common.yaml      |   6 +-
 tests/components/font/common.yaml             |   6 +-
 tests/components/font/test.host.yaml          |   6 +-
 tests/components/graph/common.yaml            |   2 +-
 .../graphical_display_menu/common.yaml        |  17 +--
 tests/components/gt911/common.yaml            |   4 +-
 tests/components/image/test.esp32-idf.yaml    |   2 +-
 tests/components/image/test.esp8266-ard.yaml  |   2 +-
 tests/components/image/test.rp2040-ard.yaml   |   2 +-
 .../components/integration/common-esp32.yaml  |   4 +-
 .../integration/test.esp8266-ard.yaml         |   4 +-
 .../integration/test.rp2040-ard.yaml          |   4 +-
 tests/components/lcd_menu/common.yaml         |   4 +-
 tests/components/light/common.yaml            |   2 +-
 tests/components/light/test.esp32-idf.yaml    |   2 +-
 tests/components/light/test.esp8266-ard.yaml  |   2 +-
 .../components/light/test.nrf52-adafruit.yaml |   4 +-
 tests/components/light/test.nrf52-mcumgr.yaml |   4 +-
 tests/components/light/test.rp2040-ard.yaml   |   2 +-
 tests/components/lilygo_t5_47/common.yaml     |   4 +-
 tests/components/lock/common.yaml             |   4 +-
 tests/components/mapping/test.esp32-idf.yaml  |   2 +-
 .../components/mapping/test.esp8266-ard.yaml  |   2 +-
 tests/components/mapping/test.rp2040-ard.yaml |   2 +-
 tests/components/monochromatic/common.yaml    |   4 +-
 tests/components/mpr121/common.yaml           |   6 +-
 tests/components/nextion/common.yaml          |   4 +-
 .../components/nextion/common_tft_upload.yaml |   2 +-
 .../nextion/common_tft_upload_watchdog.yaml   |   2 +-
 tests/components/ntc/common.yaml              |  10 +-
 tests/components/number/common.yaml           |   4 +-
 .../components/online_image/common-esp32.yaml |   2 +-
 .../online_image/common-esp8266.yaml          |   2 +-
 .../online_image/common-rp2040.yaml           |   2 +-
 .../online_image/test.esp32-s3-ard.yaml       |   2 +-
 .../online_image/test.esp32-s3-idf.yaml       |   2 +-
 tests/components/output/common.yaml           |  12 +-
 tests/components/pi4ioe5v6408/common.yaml     |   2 +-
 tests/components/pid/common.yaml              |   6 +-
 tests/components/prometheus/common.yaml       |   6 +-
 tests/components/qspi_dbi/common.yaml         |   2 +-
 .../remote_transmitter/common-buttons.yaml    |   6 +-
 tests/components/resistance/common.yaml       |   6 +-
 tests/components/rgb/common.yaml              |   8 +-
 tests/components/rgbct/common.yaml            |   8 +-
 tests/components/rgbw/common.yaml             |   8 +-
 tests/components/rgbww/common.yaml            |   8 +-
 .../rp2040_pio_led_strip/common.yaml          |   2 +-
 tests/components/rp2040_pwm/common.yaml       |   4 +-
 tests/components/sdl/common.yaml              |   8 +-
 tests/components/speaker/common.yaml          |   4 +-
 tests/components/speed/common.yaml            |   6 +-
 tests/components/sprinkler/common.yaml        |  12 +-
 tests/components/ssd1306_i2c/common.yaml      |   2 +-
 tests/components/switch/common.yaml           |   2 +-
 tests/components/sx126x/common.yaml           |   4 +-
 tests/components/sx127x/common.yaml           |   4 +-
 tests/components/template/common-base.yaml    |  14 +-
 tests/components/tt21100/common.yaml          |   4 +-
 tests/components/uart/test.esp32-idf.yaml     |   4 +-
 tests/components/udp/common.yaml              |   4 +-
 tests/components/ufire_ec/common.yaml         |   6 +-
 tests/components/ufire_ise/common.yaml        |   4 +-
 tests/components/web_server_idf/common.yaml   |   4 +-
 tests/components/wk2132_i2c/common.yaml       |   2 +-
 tests/components/wk2132_spi/common.yaml       |   2 +-
 tests/components/wk2168_i2c/common.yaml       |   2 +-
 tests/components/wk2168_spi/common.yaml       |   2 +-
 tests/components/wk2204_i2c/common.yaml       |   2 +-
 tests/components/wk2204_spi/common.yaml       |   2 +-
 tests/components/wk2212_i2c/common.yaml       |   2 +-
 tests/components/wk2212_spi/common.yaml       |   2 +-
 tests/script/test_merge_component_configs.py  |  72 +++++++++++
 115 files changed, 482 insertions(+), 252 deletions(-)
 create mode 100755 script/ci_check_duplicate_test_ids.py
 create mode 100644 tests/script/test_merge_component_configs.py

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 40267240d8..96c205fb70 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -113,6 +113,7 @@ jobs:
           script/build_language_schema.py --check
           script/generate-esp32-boards.py --check
           script/generate-rp2040-boards.py --check
+          script/ci_check_duplicate_test_ids.py
 
   import-time:
     name: Check import esphome.__main__ time
diff --git a/script/ci_check_duplicate_test_ids.py b/script/ci_check_duplicate_test_ids.py
new file mode 100755
index 0000000000..9d498dd64f
--- /dev/null
+++ b/script/ci_check_duplicate_test_ids.py
@@ -0,0 +1,122 @@
+#!/usr/bin/env python3
+"""Fail when two component test fixtures define the same id with different content.
+
+Component tests are merged and built in groups in CI (see
+``script/merge_component_configs.py``). When two components declare the same id
+under the same section but with different content, the merge silently keeps the
+first and drops the rest, which can make a cross-reference resolve to an
+incompatible entity (this is what broke the i2s_audio speaker tests). The merge
+now raises on such a collision, but only when the two components land in the same
+group. This script is the complete, batch-independent guard: it scans every
+component's ``test.<platform>.yaml`` per platform and reports any id that is
+defined by more than one component with differing content.
+
+Ids that are intentionally shared across components (e.g. a singleton
+``sntp_time`` clock) are listed in ``INTENTIONALLY_SHARED_IDS`` and skipped.
+"""
+
+from __future__ import annotations
+
+from collections import defaultdict
+from pathlib import Path
+import sys
+
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+from script.merge_component_configs import (  # noqa: E402
+    INTENTIONALLY_SHARED_IDS,
+    load_yaml_file,
+)
+
+TESTS_DIR = Path("tests/components")
+
+
+def _normalize(value: object) -> object:
+    """Return a hashable, order-independent representation for comparison."""
+    if isinstance(value, dict):
+        return tuple(sorted((str(k), _normalize(v)) for k, v in value.items()))
+    if isinstance(value, (list, tuple)):
+        return tuple(_normalize(v) for v in value)
+    # Scalars (and ESPHome tag objects like !lambda) compare by their text form
+    return str(value)
+
+
+def _collect_ids(
+    data: object, section: str, out: dict[tuple[str, str], object]
+) -> None:
+    """Walk a parsed config and record (section, id) -> normalized content."""
+    if isinstance(data, dict):
+        for key, value in data.items():
+            if isinstance(value, list):
+                for item in value:
+                    if isinstance(item, dict) and "id" in item:
+                        out[(key, str(item["id"]))] = _normalize(item)
+                    _collect_ids(item, key, out)
+            else:
+                _collect_ids(value, key, out)
+    elif isinstance(data, list):
+        for item in data:
+            _collect_ids(item, section, out)
+
+
+def _discover_platforms() -> set[str]:
+    platforms: set[str] = set()
+    for test_file in TESTS_DIR.glob("*/test.*.yaml"):
+        # test.<platform>.yaml -> platform is the middle dotted part
+        parts = test_file.name.split(".")
+        if len(parts) == 3:
+            platforms.add(parts[1])
+    return platforms
+
+
+def main() -> int:
+    conflicts: list[str] = []
+    for platform in sorted(_discover_platforms()):
+        # (section, id) -> {normalized_content: [components]}
+        by_id: dict[tuple[str, str], dict[object, list[str]]] = defaultdict(
+            lambda: defaultdict(list)
+        )
+        for comp_dir in sorted(TESTS_DIR.iterdir()):
+            if not comp_dir.is_dir():
+                continue
+            test_file = comp_dir / f"test.{platform}.yaml"
+            if not test_file.exists():
+                continue
+            try:
+                data = load_yaml_file(test_file)
+            except Exception as err:  # noqa: BLE001
+                print(f"WARNING: could not parse {test_file}: {err}", file=sys.stderr)
+                continue
+            ids: dict[tuple[str, str], object] = {}
+            _collect_ids(data, "", ids)
+            for (section, id_), content in ids.items():
+                if id_ in INTENTIONALLY_SHARED_IDS:
+                    continue
+                by_id[(section, id_)][content].append(comp_dir.name)
+
+        for (section, id_), variants in sorted(by_id.items()):
+            if len(variants) < 2:
+                continue
+            components = sorted({c for comps in variants.values() for c in comps})
+            conflicts.append(
+                f"[{platform}] id '{id_}' under '{section}' is defined "
+                f"differently by: {', '.join(components)}"
+            )
+
+    if conflicts:
+        print("Conflicting test component ids found:\n")
+        for line in conflicts:
+            print(f"  - {line}")
+        print(
+            "\nGive each component a unique id (e.g. '<component>_<id>'), or add the "
+            "id to INTENTIONALLY_SHARED_IDS in script/merge_component_configs.py if "
+            "it is a deliberately shared singleton."
+        )
+        return 1
+
+    print("No conflicting test component ids found.")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())
diff --git a/script/merge_component_configs.py b/script/merge_component_configs.py
index a952ecff16..20457e906a 100755
--- a/script/merge_component_configs.py
+++ b/script/merge_component_configs.py
@@ -161,18 +161,42 @@ def prefix_substitutions_in_dict(
     return data
 
 
+# Ids that several components intentionally share. ESPHome treats these as a
+# single instance when merged (e.g. multiple components each declaring the same
+# `sntp_time` clock collapse into one), so duplicates with differing content are
+# expected and must not be flagged as accidental collisions.
+INTENTIONALLY_SHARED_IDS = frozenset(
+    {
+        # Several components each declare an `sntp_time` clock; ESPHome merges
+        # them into one time source.
+        "sntp_time",
+        # esp_ldo and mipi_dsi both configure the channel-3 internal LDO on the
+        # ESP32-P4; only one LDO per channel may exist, so the shared id lets the
+        # merge collapse them into a single LDO.
+        "ldo_id",
+    }
+)
+
+
 def deduplicate_by_id(data: dict) -> dict:
     """Deduplicate list items with the same ID.
 
-    Keeps only the first occurrence of each ID. If items with the same ID
-    are identical, this silently deduplicates. If they differ, the first
-    one is kept (ESPHome's validation will catch if this causes issues).
+    Identical items sharing an ID (e.g. a shared bus from a common package pulled
+    in by several components) are collapsed to the first occurrence. Two items that
+    share an ID but differ in content are a real conflict: when merged, the first
+    one silently wins and the others are dropped, which can make cross-references
+    resolve to an incompatible entity. Rather than defer that to downstream
+    validation (where it surfaces as a confusing, order-dependent failure), raise
+    immediately so the offending ID is named.
 
     Args:
         data: Parsed config dictionary
 
     Returns:
         Config with deduplicated lists
+
+    Raises:
+        ValueError: If two items share an ID but have different content.
     """
     if not isinstance(data, dict):
         return data
@@ -181,16 +205,26 @@ def deduplicate_by_id(data: dict) -> dict:
     for key, value in data.items():
         if isinstance(value, list):
             # Check for items with 'id' field
-            seen_ids = set()
+            seen_items = {}
             deduped_list = []
 
             for item in value:
                 if isinstance(item, dict) and "id" in item:
                     item_id = item["id"]
-                    if item_id not in seen_ids:
-                        seen_ids.add(item_id)
+                    if item_id not in seen_items:
+                        seen_items[item_id] = item
                         deduped_list.append(item)
-                    # else: skip duplicate ID (keep first occurrence)
+                    elif item_id in INTENTIONALLY_SHARED_IDS:
+                        # Designed singleton shared by several components (e.g. an
+                        # `sntp_time` clock); ESPHome collapses these, so keep first.
+                        pass
+                    elif item != seen_items[item_id]:
+                        raise ValueError(
+                            f"Conflicting definitions for id '{item_id}' under "
+                            f"'{key}' when merging test configs; give each "
+                            f"component a unique id"
+                        )
+                    # else: identical duplicate (e.g. shared bus package) -> skip
                 else:
                     # No ID, just add it
                     deduped_list.append(item)
diff --git a/tests/components/adc/test.bk72xx-ard.yaml b/tests/components/adc/test.bk72xx-ard.yaml
index 0645333a81..09ef0e1fad 100644
--- a/tests/components/adc/test.bk72xx-ard.yaml
+++ b/tests/components/adc/test.bk72xx-ard.yaml
@@ -1,5 +1,5 @@
 sensor:
-  - id: my_sensor
+  - id: adc_my_sensor
     platform: adc
     pin: P23
     name: ADC Test sensor
diff --git a/tests/components/adc/test.esp32-c2-idf.yaml b/tests/components/adc/test.esp32-c2-idf.yaml
index e764f0fe21..a3019466b5 100644
--- a/tests/components/adc/test.esp32-c2-idf.yaml
+++ b/tests/components/adc/test.esp32-c2-idf.yaml
@@ -1,5 +1,5 @@
 sensor:
-  - id: my_sensor
+  - id: adc_my_sensor
     platform: adc
     pin: GPIO1
     name: ADC Test sensor
diff --git a/tests/components/adc/test.esp32-c3-idf.yaml b/tests/components/adc/test.esp32-c3-idf.yaml
index e764f0fe21..a3019466b5 100644
--- a/tests/components/adc/test.esp32-c3-idf.yaml
+++ b/tests/components/adc/test.esp32-c3-idf.yaml
@@ -1,5 +1,5 @@
 sensor:
-  - id: my_sensor
+  - id: adc_my_sensor
     platform: adc
     pin: GPIO1
     name: ADC Test sensor
diff --git a/tests/components/adc/test.esp32-idf.yaml b/tests/components/adc/test.esp32-idf.yaml
index ff1e3bb919..f31e0e087d 100644
--- a/tests/components/adc/test.esp32-idf.yaml
+++ b/tests/components/adc/test.esp32-idf.yaml
@@ -1,5 +1,5 @@
 sensor:
-  - id: my_sensor
+  - id: adc_my_sensor
     platform: adc
     pin: A0
     name: ADC Test sensor
diff --git a/tests/components/adc/test.esp32-p4-idf.yaml b/tests/components/adc/test.esp32-p4-idf.yaml
index b77dc299c2..77cf50d17c 100644
--- a/tests/components/adc/test.esp32-p4-idf.yaml
+++ b/tests/components/adc/test.esp32-p4-idf.yaml
@@ -1,5 +1,5 @@
 sensor:
-  - id: my_sensor
+  - id: adc_my_sensor
     platform: adc
     pin: GPIO16
     name: ADC Test sensor
diff --git a/tests/components/adc/test.esp32-s2-idf.yaml b/tests/components/adc/test.esp32-s2-idf.yaml
index e764f0fe21..a3019466b5 100644
--- a/tests/components/adc/test.esp32-s2-idf.yaml
+++ b/tests/components/adc/test.esp32-s2-idf.yaml
@@ -1,5 +1,5 @@
 sensor:
-  - id: my_sensor
+  - id: adc_my_sensor
     platform: adc
     pin: GPIO1
     name: ADC Test sensor
diff --git a/tests/components/adc/test.esp32-s3-idf.yaml b/tests/components/adc/test.esp32-s3-idf.yaml
index e764f0fe21..a3019466b5 100644
--- a/tests/components/adc/test.esp32-s3-idf.yaml
+++ b/tests/components/adc/test.esp32-s3-idf.yaml
@@ -1,5 +1,5 @@
 sensor:
-  - id: my_sensor
+  - id: adc_my_sensor
     platform: adc
     pin: GPIO1
     name: ADC Test sensor
diff --git a/tests/components/adc/test.esp8266-ard.yaml b/tests/components/adc/test.esp8266-ard.yaml
index 4cc865bb5d..617464818b 100644
--- a/tests/components/adc/test.esp8266-ard.yaml
+++ b/tests/components/adc/test.esp8266-ard.yaml
@@ -1,5 +1,5 @@
 sensor:
-  - id: my_sensor
+  - id: adc_my_sensor
     platform: adc
     pin: VCC
     name: ADC Test sensor
diff --git a/tests/components/adc/test.ln882x-ard.yaml b/tests/components/adc/test.ln882x-ard.yaml
index face38b647..d899259773 100644
--- a/tests/components/adc/test.ln882x-ard.yaml
+++ b/tests/components/adc/test.ln882x-ard.yaml
@@ -1,5 +1,5 @@
 sensor:
-  - id: my_sensor
+  - id: adc_my_sensor
     platform: adc
     pin: A5
     name: ADC Test sensor
diff --git a/tests/components/adc/test.rp2040-ard.yaml b/tests/components/adc/test.rp2040-ard.yaml
index 4cc865bb5d..617464818b 100644
--- a/tests/components/adc/test.rp2040-ard.yaml
+++ b/tests/components/adc/test.rp2040-ard.yaml
@@ -1,5 +1,5 @@
 sensor:
-  - id: my_sensor
+  - id: adc_my_sensor
     platform: adc
     pin: VCC
     name: ADC Test sensor
diff --git a/tests/components/adc/test.rp2040-pico2-ard.yaml b/tests/components/adc/test.rp2040-pico2-ard.yaml
index 4cc865bb5d..617464818b 100644
--- a/tests/components/adc/test.rp2040-pico2-ard.yaml
+++ b/tests/components/adc/test.rp2040-pico2-ard.yaml
@@ -1,5 +1,5 @@
 sensor:
-  - id: my_sensor
+  - id: adc_my_sensor
     platform: adc
     pin: VCC
     name: ADC Test sensor
diff --git a/tests/components/alarm_control_panel/common.yaml b/tests/components/alarm_control_panel/common.yaml
index 39d5739255..327234d6ca 100644
--- a/tests/components/alarm_control_panel/common.yaml
+++ b/tests/components/alarm_control_panel/common.yaml
@@ -1,6 +1,6 @@
 binary_sensor:
   - platform: gpio
-    id: bin1
+    id: alarm_control_panel_bin1
     pin: 1
 
 alarm_control_panel:
@@ -18,7 +18,7 @@ alarm_control_panel:
     pending_time: 15s
     trigger_time: 30s
     binary_sensors:
-      - input: bin1
+      - input: alarm_control_panel_bin1
         bypass_armed_home: true
         bypass_armed_night: true
         bypass_auto: true
@@ -39,7 +39,7 @@ alarm_control_panel:
     pending_time: 15s
     trigger_time: 30s
     binary_sensors:
-      - input: bin1
+      - input: alarm_control_panel_bin1
         bypass_armed_home: true
         bypass_armed_night: true
         bypass_auto: true
diff --git a/tests/components/animation/test.esp32-idf.yaml b/tests/components/animation/test.esp32-idf.yaml
index c28e9584dd..b844f5ae92 100644
--- a/tests/components/animation/test.esp32-idf.yaml
+++ b/tests/components/animation/test.esp32-idf.yaml
@@ -4,7 +4,7 @@ packages:
 
 display:
   - platform: ili9xxx
-    id: main_lcd
+    id: animation_main_lcd
     spi_id: spi_bus
     model: ili9342
     cs_pin: 12
diff --git a/tests/components/animation/test.esp8266-ard.yaml b/tests/components/animation/test.esp8266-ard.yaml
index 11a7117d91..a7937ffca2 100644
--- a/tests/components/animation/test.esp8266-ard.yaml
+++ b/tests/components/animation/test.esp8266-ard.yaml
@@ -4,7 +4,7 @@ packages:
 
 display:
   - platform: ili9xxx
-    id: main_lcd
+    id: animation_main_lcd
     spi_id: spi_bus
     model: ili9342
     cs_pin: 5
diff --git a/tests/components/animation/test.rp2040-ard.yaml b/tests/components/animation/test.rp2040-ard.yaml
index 2c99e937f3..2cbb254adf 100644
--- a/tests/components/animation/test.rp2040-ard.yaml
+++ b/tests/components/animation/test.rp2040-ard.yaml
@@ -4,7 +4,7 @@ packages:
 
 display:
   - platform: ili9xxx
-    id: main_lcd
+    id: animation_main_lcd
     spi_id: spi_bus
     model: ili9342
     cs_pin: 20
diff --git a/tests/components/axs15231/common.yaml b/tests/components/axs15231/common.yaml
index d4fd3becbb..03e82ab26e 100644
--- a/tests/components/axs15231/common.yaml
+++ b/tests/components/axs15231/common.yaml
@@ -1,7 +1,7 @@
 display:
   - platform: ssd1306_i2c
     i2c_id: i2c_bus
-    id: ssd1306_i2c_display
+    id: axs15231_ssd1306_i2c_display
     model: SSD1306_128X64
     reset_pin: 19
     pages:
@@ -13,6 +13,6 @@ touchscreen:
   - platform: axs15231
     i2c_id: i2c_bus
     id: axs15231_touchscreen
-    display: ssd1306_i2c_display
+    display: axs15231_ssd1306_i2c_display
     interrupt_pin: 20
     reset_pin: 18
diff --git a/tests/components/axs15231/test.esp8266-ard.yaml b/tests/components/axs15231/test.esp8266-ard.yaml
index eb599da773..245b87bec9 100644
--- a/tests/components/axs15231/test.esp8266-ard.yaml
+++ b/tests/components/axs15231/test.esp8266-ard.yaml
@@ -4,7 +4,7 @@ packages:
 display:
   - platform: ssd1306_i2c
     i2c_id: i2c_bus
-    id: ssd1306_display
+    id: axs15231_ssd1306_display
     model: SSD1306_128X64
     reset_pin: 13
     pages:
@@ -15,5 +15,5 @@ display:
 touchscreen:
   - platform: axs15231
     i2c_id: i2c_bus
-    display: ssd1306_display
+    display: axs15231_ssd1306_display
     interrupt_pin: 12
diff --git a/tests/components/bang_bang/common.yaml b/tests/components/bang_bang/common.yaml
index 5882025191..28798f8173 100644
--- a/tests/components/bang_bang/common.yaml
+++ b/tests/components/bang_bang/common.yaml
@@ -1,6 +1,6 @@
 switch:
   - platform: template
-    id: template_switch1
+    id: bang_bang_template_switch1
     optimistic: true
   - platform: template
     id: template_switch2
@@ -8,7 +8,7 @@ switch:
 
 sensor:
   - platform: template
-    id: template_sensor1
+    id: bang_bang_template_sensor1
     lambda: |-
       if (millis() > 10000) {
         return 42.0;
@@ -20,16 +20,16 @@ sensor:
 climate:
   - platform: bang_bang
     name: Bang Bang Climate
-    sensor: template_sensor1
-    humidity_sensor: template_sensor1
+    sensor: bang_bang_template_sensor1
+    humidity_sensor: bang_bang_template_sensor1
     default_target_temperature_low: 18°C
     default_target_temperature_high: 24°C
     idle_action:
-      - switch.turn_on: template_switch1
+      - switch.turn_on: bang_bang_template_switch1
     cool_action:
       - switch.turn_on: template_switch2
     heat_action:
-      - switch.turn_on: template_switch1
+      - switch.turn_on: bang_bang_template_switch1
     away_config:
       default_target_temperature_low: 16°C
       default_target_temperature_high: 20°C
diff --git a/tests/components/binary_sensor/common.yaml b/tests/components/binary_sensor/common.yaml
index e3fd159b08..4f4cf6ea59 100644
--- a/tests/components/binary_sensor/common.yaml
+++ b/tests/components/binary_sensor/common.yaml
@@ -1,7 +1,7 @@
 binary_sensor:
   - platform: template
     trigger_on_initial_state: true
-    id: some_binary_sensor
+    id: binary_sensor_some_binary_sensor
     name: "Random binary"
     lambda: return (random_uint32() & 1) == 0;
     filters:
@@ -21,7 +21,7 @@ binary_sensor:
             time_off: 100ms
             time_on: 400ms
       - lambda: |-
-          if (id(some_binary_sensor).state) {
+          if (id(binary_sensor_some_binary_sensor).state) {
             return x;
           }
           return {};
@@ -36,7 +36,7 @@ binary_sensor:
         - logger.log:
             format: "New state is %s"
             args: ['x.has_value() ? ONOFF(x) : "Unknown"']
-        - binary_sensor.invalidate_state: some_binary_sensor
+        - binary_sensor.invalidate_state: binary_sensor_some_binary_sensor
 
   # Test autorepeat with default configuration (no timings)
   - platform: template
diff --git a/tests/components/binary_sensor_map/common.yaml b/tests/components/binary_sensor_map/common.yaml
index c054022583..667d0be9e7 100644
--- a/tests/components/binary_sensor_map/common.yaml
+++ b/tests/components/binary_sensor_map/common.yaml
@@ -1,20 +1,20 @@
 binary_sensor:
   - platform: template
-    id: bin1
+    id: binary_sensor_map_bin1
     lambda: |-
       if (millis() > 10000) {
         return true;
       }
       return false;
   - platform: template
-    id: bin2
+    id: binary_sensor_map_bin2
     lambda: |-
       if (millis() > 20000) {
         return true;
       }
       return false;
   - platform: template
-    id: bin3
+    id: binary_sensor_map_bin3
     lambda: |-
       if (millis() > 30000) {
         return true;
@@ -26,33 +26,33 @@ sensor:
     name: Binary Sensor Map Group
     type: group
     channels:
-      - binary_sensor: bin1
+      - binary_sensor: binary_sensor_map_bin1
         value: 10.0
-      - binary_sensor: bin2
+      - binary_sensor: binary_sensor_map_bin2
         value: 15.0
-      - binary_sensor: bin3
+      - binary_sensor: binary_sensor_map_bin3
         value: 100.0
   - platform: binary_sensor_map
     name: Binary Sensor Map Sum
     type: sum
     channels:
-      - binary_sensor: bin1
+      - binary_sensor: binary_sensor_map_bin1
         value: 10.0
-      - binary_sensor: bin2
+      - binary_sensor: binary_sensor_map_bin2
         value: 15.0
-      - binary_sensor: bin3
+      - binary_sensor: binary_sensor_map_bin3
         value: 100.0
   - platform: binary_sensor_map
     name: Binary Sensor Map Bayesian
     type: bayesian
     prior: 0.4
     observations:
-      - binary_sensor: bin1
+      - binary_sensor: binary_sensor_map_bin1
         prob_given_true: 0.9
         prob_given_false: 0.4
-      - binary_sensor: bin2
+      - binary_sensor: binary_sensor_map_bin2
         prob_given_true: 0.7
         prob_given_false: 0.05
-      - binary_sensor: bin3
+      - binary_sensor: binary_sensor_map_bin3
         prob_given_true: 0.8
         prob_given_false: 0.2
diff --git a/tests/components/ble_client/common.yaml b/tests/components/ble_client/common.yaml
index 4ea1dd60f3..4ed6ad7fc9 100644
--- a/tests/components/ble_client/common.yaml
+++ b/tests/components/ble_client/common.yaml
@@ -56,7 +56,7 @@ sensor:
 number:
   - platform: template
     name: "Test Number"
-    id: test_number
+    id: ble_client_test_number
     optimistic: true
     min_value: 0
     max_value: 255
@@ -72,5 +72,5 @@ button:
           service_uuid: "abcd1234-abcd-1234-abcd-abcd12345678"
           characteristic_uuid: "abcd1235-abcd-1234-abcd-abcd12345678"
           value: !lambda |-
-            uint8_t val = (uint8_t)id(test_number).state;
+            uint8_t val = (uint8_t)id(ble_client_test_number).state;
             return std::vector<uint8_t>{0xAA, val, 0xBB};
diff --git a/tests/components/canbus/common.yaml b/tests/components/canbus/common.yaml
index e779f7f078..3ba3564608 100644
--- a/tests/components/canbus/common.yaml
+++ b/tests/components/canbus/common.yaml
@@ -1,6 +1,6 @@
 canbus:
   - platform: esp32_can
-    id: esp32_internal_can
+    id: canbus_esp32_internal_can
     rx_pin: 4
     tx_pin: 5
     can_id: 4
@@ -40,7 +40,7 @@ canbus:
 number:
   - platform: template
     name: "Test Number"
-    id: test_number
+    id: canbus_test_number
     optimistic: true
     min_value: 0
     max_value: 255
@@ -62,5 +62,5 @@ button:
       - canbus.send: !lambda return {0, 1, 2};
       # Test canbus.send with lambda that references a component (function pointer)
       - canbus.send: !lambda |-
-          uint8_t val = (uint8_t)id(test_number).state;
+          uint8_t val = (uint8_t)id(canbus_test_number).state;
           return std::vector<uint8_t>{0xAA, val, 0xBB};
diff --git a/tests/components/climate_ir_lg/common.yaml b/tests/components/climate_ir_lg/common.yaml
index 37011b16ee..e0bc185d2c 100644
--- a/tests/components/climate_ir_lg/common.yaml
+++ b/tests/components/climate_ir_lg/common.yaml
@@ -1,6 +1,6 @@
 sensor:
   - platform: template
-    id: temp_sensor
+    id: climate_ir_lg_temp_sensor
     lambda: return 22.0;
     update_interval: 60s
   - platform: template
@@ -12,5 +12,5 @@ climate:
   - platform: climate_ir_lg
     name: LG Climate
     transmitter_id: xmitr
-    sensor: temp_sensor
+    sensor: climate_ir_lg_temp_sensor
     humidity_sensor: humidity_sensor
diff --git a/tests/components/color_temperature/common.yaml b/tests/components/color_temperature/common.yaml
index fe0c5bf917..0db54d10d0 100644
--- a/tests/components/color_temperature/common.yaml
+++ b/tests/components/color_temperature/common.yaml
@@ -1,15 +1,15 @@
 output:
   - platform: ${light_platform}
-    id: light_output_1
+    id: color_temperature_light_output_1
     pin: ${pin_o1}
   - platform: ${light_platform}
-    id: light_output_2
+    id: color_temperature_light_output_2
     pin: ${pin_o2}
 
 light:
   - platform: color_temperature
     name: Lights
-    color_temperature: light_output_1
-    brightness: light_output_2
+    color_temperature: color_temperature_light_output_1
+    brightness: color_temperature_light_output_2
     cold_white_color_temperature: 153 mireds
     warm_white_color_temperature: 500 mireds
diff --git a/tests/components/copy/common.yaml b/tests/components/copy/common.yaml
index a376004b2f..cbd056f070 100644
--- a/tests/components/copy/common.yaml
+++ b/tests/components/copy/common.yaml
@@ -1,17 +1,17 @@
 output:
   - platform: ${pwm_platform}
-    id: fan_output_1
+    id: copy_fan_output_1
     pin: ${pin}
 
 fan:
   - platform: speed
-    id: fan_speed
-    output: fan_output_1
+    id: copy_fan_speed
+    output: copy_fan_output_1
     preset_modes:
       - Eco
       - Turbo
   - platform: copy
-    source_id: fan_speed
+    source_id: copy_fan_speed
     name: Fan Speed Copy
 
 select:
diff --git a/tests/components/current_based/common.yaml b/tests/components/current_based/common.yaml
index 503c4596e9..139571ccec 100644
--- a/tests/components/current_based/common.yaml
+++ b/tests/components/current_based/common.yaml
@@ -31,7 +31,7 @@ sensor:
 
 switch:
   - platform: template
-    id: template_switch1
+    id: current_based_template_switch1
     optimistic: true
   - platform: template
     id: template_switch2
@@ -46,7 +46,7 @@ cover:
     open_obstacle_current_threshold: 0.8
     open_duration: 12s
     open_action:
-      - switch.turn_on: template_switch1
+      - switch.turn_on: current_based_template_switch1
     close_sensor: ade7953_current_b
     close_moving_current_threshold: 0.5
     close_obstacle_current_threshold: 0.8
@@ -54,7 +54,7 @@ cover:
     close_action:
       - switch.turn_on: template_switch2
     stop_action:
-      - switch.turn_off: template_switch1
+      - switch.turn_off: current_based_template_switch1
       - switch.turn_off: template_switch2
     obstacle_rollback: 30%
     start_sensing_delay: 0.8s
diff --git a/tests/components/cwww/common.yaml b/tests/components/cwww/common.yaml
index 7fa5ab668c..bbb6c9182b 100644
--- a/tests/components/cwww/common.yaml
+++ b/tests/components/cwww/common.yaml
@@ -1,8 +1,8 @@
 light:
   - platform: cwww
     name: CWWW Light
-    cold_white: light_output_1
-    warm_white: light_output_2
+    cold_white: cwww_light_output_1
+    warm_white: cwww_light_output_2
     cold_white_color_temperature: 153 mireds
     warm_white_color_temperature: 500 mireds
     constant_brightness: true
diff --git a/tests/components/cwww/test.esp32-idf.yaml b/tests/components/cwww/test.esp32-idf.yaml
index 01edf0b0b5..0665879b08 100644
--- a/tests/components/cwww/test.esp32-idf.yaml
+++ b/tests/components/cwww/test.esp32-idf.yaml
@@ -5,11 +5,11 @@ substitutions:
 
 output:
   - platform: ${light_platform}
-    id: light_output_1
+    id: cwww_light_output_1
     pin: ${pin_o1}
     channel: 0
   - platform: ${light_platform}
-    id: light_output_2
+    id: cwww_light_output_2
     pin: ${pin_o2}
     channel: 1
     phase_angle: 180°
diff --git a/tests/components/cwww/test.esp8266-ard.yaml b/tests/components/cwww/test.esp8266-ard.yaml
index 49d73b7d3d..bb1868fdef 100644
--- a/tests/components/cwww/test.esp8266-ard.yaml
+++ b/tests/components/cwww/test.esp8266-ard.yaml
@@ -5,10 +5,10 @@ substitutions:
 
 output:
   - platform: ${light_platform}
-    id: light_output_1
+    id: cwww_light_output_1
     pin: ${pin_o1}
   - platform: ${light_platform}
-    id: light_output_2
+    id: cwww_light_output_2
     pin: ${pin_o2}
 
 <<: !include common.yaml
diff --git a/tests/components/cwww/test.rp2040-ard.yaml b/tests/components/cwww/test.rp2040-ard.yaml
index ba8e0ad071..27fc930b68 100644
--- a/tests/components/cwww/test.rp2040-ard.yaml
+++ b/tests/components/cwww/test.rp2040-ard.yaml
@@ -5,10 +5,10 @@ substitutions:
 
 output:
   - platform: ${light_platform}
-    id: light_output_1
+    id: cwww_light_output_1
     pin: ${pin_o1}
   - platform: ${light_platform}
-    id: light_output_2
+    id: cwww_light_output_2
     pin: ${pin_o2}
 
 <<: !include common.yaml
diff --git a/tests/components/display/common.yaml b/tests/components/display/common.yaml
index a722a5f7c2..6617671972 100644
--- a/tests/components/display/common.yaml
+++ b/tests/components/display/common.yaml
@@ -1,6 +1,6 @@
 display:
   - platform: ili9xxx
-    id: main_lcd
+    id: display_main_lcd
     model: ili9342
     cs_pin: 12
     dc_pin: 13
diff --git a/tests/components/duty_time/common.yaml b/tests/components/duty_time/common.yaml
index 761d10f16a..12e4397c49 100644
--- a/tests/components/duty_time/common.yaml
+++ b/tests/components/duty_time/common.yaml
@@ -1,6 +1,6 @@
 binary_sensor:
   - platform: template
-    id: bin1
+    id: duty_time_bin1
     lambda: |-
       if (millis() > 10000) {
         return true;
@@ -10,4 +10,4 @@ binary_sensor:
 sensor:
   - platform: duty_time
     name: Duty Time
-    sensor: bin1
+    sensor: duty_time_bin1
diff --git a/tests/components/e131/test.rp2040-ard.yaml b/tests/components/e131/test.rp2040-ard.yaml
index 25fe3b6796..4593784ef9 100644
--- a/tests/components/e131/test.rp2040-ard.yaml
+++ b/tests/components/e131/test.rp2040-ard.yaml
@@ -2,7 +2,7 @@
 
 light:
   - platform: rp2040_pio_led_strip
-    id: led_strip
+    id: e131_led_strip
     pin: 2
     pio: 0
     num_leds: 256
diff --git a/tests/components/ektf2232/common.yaml b/tests/components/ektf2232/common.yaml
index 1c4d768b08..070b03eeb9 100644
--- a/tests/components/ektf2232/common.yaml
+++ b/tests/components/ektf2232/common.yaml
@@ -1,7 +1,7 @@
 display:
   - platform: ssd1306_i2c
     i2c_id: i2c_bus
-    id: ssd1306_i2c_display
+    id: ektf2232_ssd1306_i2c_display
     model: SSD1306_128X64
     reset_pin: ${display_reset_pin}
     pages:
@@ -15,7 +15,7 @@ touchscreen:
     id: ektf2232_touchscreen
     interrupt_pin: ${interrupt_pin}
     reset_pin: ${touch_reset_pin}
-    display: ssd1306_i2c_display
+    display: ektf2232_ssd1306_i2c_display
     on_touch:
       - logger.log:
           format: Touch at (%d, %d)
diff --git a/tests/components/endstop/common.yaml b/tests/components/endstop/common.yaml
index b92b1e13b9..6f5cf61268 100644
--- a/tests/components/endstop/common.yaml
+++ b/tests/components/endstop/common.yaml
@@ -1,6 +1,6 @@
 binary_sensor:
   - platform: template
-    id: bin1
+    id: endstop_bin1
     lambda: |-
       if (millis() > 10000) {
         return true;
@@ -9,7 +9,7 @@ binary_sensor:
 
 switch:
   - platform: template
-    id: template_switch1
+    id: endstop_template_switch1
     optimistic: true
   - platform: template
     id: template_switch2
@@ -20,12 +20,12 @@ cover:
     id: endstop_cover
     name: Endstop Cover
     stop_action:
-      - switch.turn_on: template_switch1
-    open_endstop: bin1
+      - switch.turn_on: endstop_template_switch1
+    open_endstop: endstop_bin1
     open_action:
-      - switch.turn_on: template_switch1
+      - switch.turn_on: endstop_template_switch1
     open_duration: 5min
-    close_endstop: bin1
+    close_endstop: endstop_bin1
     close_action:
       - switch.turn_on: template_switch2
     close_duration: 4.5min
diff --git a/tests/components/esp32_can/common.yaml b/tests/components/esp32_can/common.yaml
index 3b9b33c048..f15b609d84 100644
--- a/tests/components/esp32_can/common.yaml
+++ b/tests/components/esp32_can/common.yaml
@@ -13,7 +13,7 @@ esphome:
 
 canbus:
   - platform: esp32_can
-    id: esp32_internal_can
+    id: esp32_can_esp32_internal_can
     rx_pin: ${rx_pin}
     tx_pin: ${tx_pin}
     can_id: 4
diff --git a/tests/components/esp32_can/test.esp32-c6-idf.yaml b/tests/components/esp32_can/test.esp32-c6-idf.yaml
index ac978482fc..c548b4f0f4 100644
--- a/tests/components/esp32_can/test.esp32-c6-idf.yaml
+++ b/tests/components/esp32_can/test.esp32-c6-idf.yaml
@@ -3,20 +3,20 @@ esphome:
     then:
       - canbus.send:
           # Extended ID explicit
-          canbus_id: esp32_internal_can
+          canbus_id: esp32_can_esp32_internal_can
           use_extended_id: true
           can_id: 0x100
           data: [0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08]
       - canbus.send:
           # Standard ID by default
-          canbus_id: esp32_internal_can
+          canbus_id: esp32_can_esp32_internal_can
           can_id: 0x100
           data: [0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08]
       # Note: esp32_internal_can_2 uses LISTENONLY mode, so no send actions
 
 canbus:
   - platform: esp32_can
-    id: esp32_internal_can
+    id: esp32_can_esp32_internal_can
     rx_pin: GPIO8
     tx_pin: GPIO7
     can_id: 4
diff --git a/tests/components/espnow/common.yaml b/tests/components/espnow/common.yaml
index bdc478ea03..f05735e8f4 100644
--- a/tests/components/espnow/common.yaml
+++ b/tests/components/espnow/common.yaml
@@ -62,7 +62,7 @@ packet_transport:
     encryption:
       key: "0123456789abcdef0123456789abcdef"
     sensors:
-      - temp_sensor
+      - espnow_temp_sensor
     providers:
       - name: test-provider
         encryption:
@@ -70,9 +70,9 @@ packet_transport:
 
 sensor:
   - platform: internal_temperature
-    id: temp_sensor
+    id: espnow_temp_sensor
 
   - platform: packet_transport
     provider: test-provider
-    remote_id: temp_sensor
+    remote_id: espnow_temp_sensor
     id: remote_temp
diff --git a/tests/components/fastled_clockless/common.yaml b/tests/components/fastled_clockless/common.yaml
index 8b1447a17a..a7ce7ed280 100644
--- a/tests/components/fastled_clockless/common.yaml
+++ b/tests/components/fastled_clockless/common.yaml
@@ -1,6 +1,6 @@
 light:
   - platform: fastled_clockless
-    id: addr1
+    id: fastled_clockless_addr1
     chipset: WS2811
     pin: 13
     num_leds: 100
@@ -59,13 +59,13 @@ light:
           name: Custom Effect
           sequence:
             - light.addressable_set:
-                id: addr1
+                id: fastled_clockless_addr1
                 red: 100%
                 green: 100%
                 blue: 0%
             - delay: 100ms
             - light.addressable_set:
-                id: addr1
+                id: fastled_clockless_addr1
                 red: 0%
                 green: 100%
                 blue: 0%
diff --git a/tests/components/fastled_spi/common.yaml b/tests/components/fastled_spi/common.yaml
index f6f7c5553b..19d00627f8 100644
--- a/tests/components/fastled_spi/common.yaml
+++ b/tests/components/fastled_spi/common.yaml
@@ -1,6 +1,6 @@
 light:
   - platform: fastled_spi
-    id: addr1
+    id: fastled_spi_addr1
     chipset: WS2801
     clock_pin: 22
     data_pin: 23
@@ -59,13 +59,13 @@ light:
           name: Custom Effect
           sequence:
             - light.addressable_set:
-                id: addr1
+                id: fastled_spi_addr1
                 red: 100%
                 green: 100%
                 blue: 0%
             - delay: 100ms
             - light.addressable_set:
-                id: addr1
+                id: fastled_spi_addr1
                 red: 0%
                 green: 100%
                 blue: 0%
diff --git a/tests/components/font/common.yaml b/tests/components/font/common.yaml
index c156b4aea1..59063291e7 100644
--- a/tests/components/font/common.yaml
+++ b/tests/components/font/common.yaml
@@ -8,7 +8,7 @@ font:
     id: roboto32
 
   - file: "gfonts://Roboto"
-    id: roboto
+    id: font_roboto
     size: 20
     glyphs: "0123456789."
     extras:
@@ -50,11 +50,11 @@ font:
 display:
   - platform: ssd1306_i2c
     i2c_id: i2c_bus
-    id: ssd1306_display
+    id: font_ssd1306_display
     model: SSD1306_128X64
     reset_pin: ${display_reset_pin}
     lambda: |-
-      it.print(0, 0, id(roboto), "Hello, World!");
+      it.print(0, 0, id(font_roboto), "Hello, World!");
       it.print(0, 20, id(roboto_web), "Hello, World!");
       it.print(0, 40, id(monocraft), "Hello, World!");
       it.print(0, 60, id(monocraft2), "Hello, World!");
diff --git a/tests/components/font/test.host.yaml b/tests/components/font/test.host.yaml
index 387ea47335..8ada8b7a4e 100644
--- a/tests/components/font/test.host.yaml
+++ b/tests/components/font/test.host.yaml
@@ -8,7 +8,7 @@ font:
     id: roboto32
 
   - file: "gfonts://Roboto"
-    id: roboto
+    id: font_roboto
     size: 20
     glyphs: "0123456789."
     extras:
@@ -44,12 +44,12 @@ font:
 
 display:
   - platform: sdl
-    id: sdl_display
+    id: font_sdl_display
     dimensions:
       width: 800
       height: 600
     lambda: |-
-      it.print(0, 0, id(roboto), "Hello, World!");
+      it.print(0, 0, id(font_roboto), "Hello, World!");
       it.print(0, 20, id(roboto_web), "Hello, World!");
       it.print(0, 40, id(roboto_greek), "Hello κόσμε!");
       it.print(0, 60, id(monocraft), "Hello, World!");
diff --git a/tests/components/graph/common.yaml b/tests/components/graph/common.yaml
index 11e2a16ca1..edf4493aa6 100644
--- a/tests/components/graph/common.yaml
+++ b/tests/components/graph/common.yaml
@@ -12,7 +12,7 @@ graph:
 display:
   - platform: ssd1306_i2c
     i2c_id: i2c_bus
-    id: ssd1306_display
+    id: graph_ssd1306_display
     model: SSD1306_128X64
     reset_pin: ${reset_pin}
     pages:
diff --git a/tests/components/graphical_display_menu/common.yaml b/tests/components/graphical_display_menu/common.yaml
index 6cee2af232..50f8a5bc85 100644
--- a/tests/components/graphical_display_menu/common.yaml
+++ b/tests/components/graphical_display_menu/common.yaml
@@ -1,6 +1,7 @@
 display:
   - platform: ssd1306_i2c
-    id: ssd1306_i2c_display
+    i2c_id: i2c_bus
+    id: graphical_display_menu_ssd1306_i2c_display
     model: SSD1306_128X64
     reset_pin: ${reset_pin}
     pages:
@@ -10,12 +11,12 @@ display:
 
 font:
   - file: "gfonts://Roboto"
-    id: roboto
+    id: graphical_display_menu_roboto
     size: 20
 
 number:
   - platform: template
-    id: test_number
+    id: graphical_display_menu_test_number
     min_value: 0
     step: 1
     max_value: 10
@@ -31,13 +32,13 @@ select:
 
 switch:
   - platform: template
-    id: test_switch
+    id: graphical_display_menu_test_switch
     optimistic: true
 
 graphical_display_menu:
   id: test_graphical_display_menu
-  display: ssd1306_i2c_display
-  font: roboto
+  display: graphical_display_menu_ssd1306_i2c_display
+  font: graphical_display_menu_roboto
   active: false
   mode: rotary
   on_enter:
@@ -80,7 +81,7 @@ graphical_display_menu:
           lambda: 'ESP_LOGI("graphical_display_menu", "select value: %s, %s", it->get_text().c_str(), it->get_value_text().c_str());'
     - type: number
       text: "Number"
-      number: test_number
+      number: graphical_display_menu_test_number
       on_enter:
         then:
           lambda: 'ESP_LOGI("graphical_display_menu", "number enter: %s, %s", it->get_text().c_str(), it->get_value_text().c_str());'
@@ -97,7 +98,7 @@ graphical_display_menu:
           - display_menu.hide: test_graphical_display_menu
     - type: switch
       text: "Switch"
-      switch: test_switch
+      switch: graphical_display_menu_test_switch
       on_text: "Bright"
       off_text: "Dark"
       immediate_edit: false
diff --git a/tests/components/gt911/common.yaml b/tests/components/gt911/common.yaml
index ff464cda24..0fc40737f0 100644
--- a/tests/components/gt911/common.yaml
+++ b/tests/components/gt911/common.yaml
@@ -1,7 +1,7 @@
 display:
   - platform: ssd1306_i2c
     i2c_id: i2c_bus
-    id: ssd1306_i2c_display
+    id: gt911_ssd1306_i2c_display
     model: SSD1306_128X64
     reset_pin: ${display_reset_pin}
     pages:
@@ -13,7 +13,7 @@ touchscreen:
   - platform: gt911
     i2c_id: i2c_bus
     id: gt911_touchscreen
-    display: ssd1306_i2c_display
+    display: gt911_ssd1306_i2c_display
     interrupt_pin: ${interrupt_pin}
     reset_pin: ${reset_pin}
 
diff --git a/tests/components/image/test.esp32-idf.yaml b/tests/components/image/test.esp32-idf.yaml
index aea2b4bbb0..9e93c4c289 100644
--- a/tests/components/image/test.esp32-idf.yaml
+++ b/tests/components/image/test.esp32-idf.yaml
@@ -3,7 +3,7 @@ packages:
 
 display:
   - platform: ili9xxx
-    id: main_lcd
+    id: image_main_lcd
     spi_id: spi_bus
     model: ili9342
     cs_pin: 15
diff --git a/tests/components/image/test.esp8266-ard.yaml b/tests/components/image/test.esp8266-ard.yaml
index 2e7bfc5ae5..492b57c449 100644
--- a/tests/components/image/test.esp8266-ard.yaml
+++ b/tests/components/image/test.esp8266-ard.yaml
@@ -3,7 +3,7 @@ packages:
 
 display:
   - platform: ili9xxx
-    id: main_lcd
+    id: image_main_lcd
     spi_id: spi_bus
     model: ili9342
     cs_pin: 5
diff --git a/tests/components/image/test.rp2040-ard.yaml b/tests/components/image/test.rp2040-ard.yaml
index 03a9c42a38..ce2a13fca7 100644
--- a/tests/components/image/test.rp2040-ard.yaml
+++ b/tests/components/image/test.rp2040-ard.yaml
@@ -3,7 +3,7 @@ packages:
 
 display:
   - platform: ili9xxx
-    id: main_lcd
+    id: image_main_lcd
     spi_id: spi_bus
     model: ili9342
     cs_pin: 20
diff --git a/tests/components/integration/common-esp32.yaml b/tests/components/integration/common-esp32.yaml
index 26550d3c5c..c912fb9b84 100644
--- a/tests/components/integration/common-esp32.yaml
+++ b/tests/components/integration/common-esp32.yaml
@@ -9,11 +9,11 @@ esphome:
 
 sensor:
   - platform: adc
-    id: my_sensor
+    id: integration_my_sensor
     pin: ${pin}
     attenuation: 12db
   - platform: integration
     id: integration_sensor
-    sensor: my_sensor
+    sensor: integration_my_sensor
     name: Integration Sensor
     time_unit: s
diff --git a/tests/components/integration/test.esp8266-ard.yaml b/tests/components/integration/test.esp8266-ard.yaml
index 51d3e19077..377bad5578 100644
--- a/tests/components/integration/test.esp8266-ard.yaml
+++ b/tests/components/integration/test.esp8266-ard.yaml
@@ -1,8 +1,8 @@
 sensor:
   - platform: adc
-    id: my_sensor
+    id: integration_my_sensor
     pin: VCC
   - platform: integration
-    sensor: my_sensor
+    sensor: integration_my_sensor
     name: Integration Sensor
     time_unit: s
diff --git a/tests/components/integration/test.rp2040-ard.yaml b/tests/components/integration/test.rp2040-ard.yaml
index 51d3e19077..377bad5578 100644
--- a/tests/components/integration/test.rp2040-ard.yaml
+++ b/tests/components/integration/test.rp2040-ard.yaml
@@ -1,8 +1,8 @@
 sensor:
   - platform: adc
-    id: my_sensor
+    id: integration_my_sensor
     pin: VCC
   - platform: integration
-    sensor: my_sensor
+    sensor: integration_my_sensor
     name: Integration Sensor
     time_unit: s
diff --git a/tests/components/lcd_menu/common.yaml b/tests/components/lcd_menu/common.yaml
index 970c18e0d2..a7740e771d 100644
--- a/tests/components/lcd_menu/common.yaml
+++ b/tests/components/lcd_menu/common.yaml
@@ -1,6 +1,6 @@
 number:
   - platform: template
-    id: test_number
+    id: lcd_menu_test_number
     min_value: 0
     step: 1
     max_value: 10
@@ -83,7 +83,7 @@ lcd_menu:
           lambda: 'ESP_LOGI("lcd_menu", "select value: %s, %s", it->get_text().c_str(), it->get_value_text().c_str());'
     - type: number
       text: Number
-      number: test_number
+      number: lcd_menu_test_number
       on_enter:
         then:
           lambda: 'ESP_LOGI("lcd_menu", "number enter: %s, %s", it->get_text().c_str(), it->get_value_text().c_str());'
diff --git a/tests/components/light/common.yaml b/tests/components/light/common.yaml
index 2acc080c6d..71c00e5f10 100644
--- a/tests/components/light/common.yaml
+++ b/tests/components/light/common.yaml
@@ -156,7 +156,7 @@ light:
   - platform: binary
     id: test_binary_light
     name: Binary Light
-    output: test_binary
+    output: light_test_binary
     effects:
       - strobe:
     on_state:
diff --git a/tests/components/light/test.esp32-idf.yaml b/tests/components/light/test.esp32-idf.yaml
index 925197182c..49e49b4318 100644
--- a/tests/components/light/test.esp32-idf.yaml
+++ b/tests/components/light/test.esp32-idf.yaml
@@ -1,6 +1,6 @@
 output:
   - platform: gpio
-    id: test_binary
+    id: light_test_binary
     pin: 12
   - platform: ledc
     id: test_ledc_1
diff --git a/tests/components/light/test.esp8266-ard.yaml b/tests/components/light/test.esp8266-ard.yaml
index 518011e925..1eb58eabc4 100644
--- a/tests/components/light/test.esp8266-ard.yaml
+++ b/tests/components/light/test.esp8266-ard.yaml
@@ -1,6 +1,6 @@
 output:
   - platform: gpio
-    id: test_binary
+    id: light_test_binary
     pin: 4
   - platform: esp8266_pwm
     id: test_ledc_1
diff --git a/tests/components/light/test.nrf52-adafruit.yaml b/tests/components/light/test.nrf52-adafruit.yaml
index cb421ed4bb..60521b8088 100644
--- a/tests/components/light/test.nrf52-adafruit.yaml
+++ b/tests/components/light/test.nrf52-adafruit.yaml
@@ -5,14 +5,14 @@ esphome:
 
 output:
   - platform: gpio
-    id: test_binary
+    id: light_test_binary
     pin: 0
 
 light:
   - platform: binary
     id: test_binary_light
     name: Binary Light
-    output: test_binary
+    output: light_test_binary
     effects:
       - strobe:
     on_state:
diff --git a/tests/components/light/test.nrf52-mcumgr.yaml b/tests/components/light/test.nrf52-mcumgr.yaml
index cb421ed4bb..60521b8088 100644
--- a/tests/components/light/test.nrf52-mcumgr.yaml
+++ b/tests/components/light/test.nrf52-mcumgr.yaml
@@ -5,14 +5,14 @@ esphome:
 
 output:
   - platform: gpio
-    id: test_binary
+    id: light_test_binary
     pin: 0
 
 light:
   - platform: binary
     id: test_binary_light
     name: Binary Light
-    output: test_binary
+    output: light_test_binary
     effects:
       - strobe:
     on_state:
diff --git a/tests/components/light/test.rp2040-ard.yaml b/tests/components/light/test.rp2040-ard.yaml
index a5a37fd559..21d5cad774 100644
--- a/tests/components/light/test.rp2040-ard.yaml
+++ b/tests/components/light/test.rp2040-ard.yaml
@@ -1,6 +1,6 @@
 output:
   - platform: gpio
-    id: test_binary
+    id: light_test_binary
     pin: 0
   - platform: rp2040_pwm
     id: test_ledc_1
diff --git a/tests/components/lilygo_t5_47/common.yaml b/tests/components/lilygo_t5_47/common.yaml
index 18f1ba10ae..5e71736eb0 100644
--- a/tests/components/lilygo_t5_47/common.yaml
+++ b/tests/components/lilygo_t5_47/common.yaml
@@ -1,7 +1,7 @@
 display:
   - platform: ssd1306_i2c
     i2c_id: i2c_bus
-    id: ssd1306_i2c_display
+    id: lilygo_t5_47_ssd1306_i2c_display
     model: SSD1306_128X64
     reset_pin: ${reset_pin}
     pages:
@@ -14,7 +14,7 @@ touchscreen:
     i2c_id: i2c_bus
     id: lilygo_touchscreen
     interrupt_pin: ${interrupt_pin}
-    display: ssd1306_i2c_display
+    display: lilygo_t5_47_ssd1306_i2c_display
     on_touch:
       - logger.log:
           format: Touch at (%d, %d)
diff --git a/tests/components/lock/common.yaml b/tests/components/lock/common.yaml
index 9ba7f34857..08001855cb 100644
--- a/tests/components/lock/common.yaml
+++ b/tests/components/lock/common.yaml
@@ -7,7 +7,7 @@ esphome:
 
 output:
   - platform: gpio
-    id: test_binary
+    id: lock_test_binary
     pin: 4
 
 lock:
@@ -32,4 +32,4 @@ lock:
   - platform: output
     name: Generic Output Lock
     id: test_lock2
-    output: test_binary
+    output: lock_test_binary
diff --git a/tests/components/mapping/test.esp32-idf.yaml b/tests/components/mapping/test.esp32-idf.yaml
index 93adcf9988..d99f8ddc4e 100644
--- a/tests/components/mapping/test.esp32-idf.yaml
+++ b/tests/components/mapping/test.esp32-idf.yaml
@@ -5,7 +5,7 @@ packages:
 display:
   spi_id: spi_bus
   platform: mipi_spi
-  id: main_lcd
+  id: mapping_main_lcd
   model: ili9342
   cs_pin: 12
   dc_pin: 13
diff --git a/tests/components/mapping/test.esp8266-ard.yaml b/tests/components/mapping/test.esp8266-ard.yaml
index 6a308b67dd..e51240f20d 100644
--- a/tests/components/mapping/test.esp8266-ard.yaml
+++ b/tests/components/mapping/test.esp8266-ard.yaml
@@ -5,7 +5,7 @@ packages:
 display:
   spi_id: spi_bus
   platform: mipi_spi
-  id: main_lcd
+  id: mapping_main_lcd
   model: ili9342
   cs_pin: 5
   dc_pin: 15
diff --git a/tests/components/mapping/test.rp2040-ard.yaml b/tests/components/mapping/test.rp2040-ard.yaml
index 01b83c4ab8..0562a4ba51 100644
--- a/tests/components/mapping/test.rp2040-ard.yaml
+++ b/tests/components/mapping/test.rp2040-ard.yaml
@@ -5,7 +5,7 @@ packages:
 display:
   spi_id: spi_bus
   platform: mipi_spi
-  id: main_lcd
+  id: mapping_main_lcd
   model: ili9342
   data_rate: 31.25MHz
   cs_pin: 20
diff --git a/tests/components/monochromatic/common.yaml b/tests/components/monochromatic/common.yaml
index 9915e086eb..e57c7bec29 100644
--- a/tests/components/monochromatic/common.yaml
+++ b/tests/components/monochromatic/common.yaml
@@ -1,13 +1,13 @@
 output:
   - platform: ${light_platform}
-    id: light_output_1
+    id: monochromatic_light_output_1
     pin: ${pin}
 
 light:
   - platform: monochromatic
     name: Monochromatic Light
     id: monochromatic_light
-    output: light_output_1
+    output: monochromatic_light_output_1
     gamma_correct: 2.8
     default_transition_length: 2s
     effects:
diff --git a/tests/components/mpr121/common.yaml b/tests/components/mpr121/common.yaml
index 67a06cf9c1..f96651e9bf 100644
--- a/tests/components/mpr121/common.yaml
+++ b/tests/components/mpr121/common.yaml
@@ -9,15 +9,15 @@ binary_sensor:
     name: touchkey0
     channel: 0
   - platform: mpr121
-    id: bin1
+    id: mpr121_bin1
     name: touchkey1
     channel: 1
   - platform: mpr121
-    id: bin2
+    id: mpr121_bin2
     name: touchkey2
     channel: 2
   - platform: mpr121
-    id: bin3
+    id: mpr121_bin3
     name: touchkey3
     channel: 6
 
diff --git a/tests/components/nextion/common.yaml b/tests/components/nextion/common.yaml
index d79e3ee2ed..9eadd97a6d 100644
--- a/tests/components/nextion/common.yaml
+++ b/tests/components/nextion/common.yaml
@@ -1,6 +1,6 @@
 esphome:
   on_boot:
-    - lambda: 'ESP_LOGD("display","is_connected(): %s", YESNO(id(main_lcd).is_connected()));'
+    - lambda: 'ESP_LOGD("display","is_connected(): %s", YESNO(id(nextion_main_lcd).is_connected()));'
 
     - display.nextion.set_brightness: 80%
 
@@ -272,7 +272,7 @@ text_sensor:
 
 display:
   - platform: nextion
-    id: main_lcd
+    id: nextion_main_lcd
     auto_wake_on_touch: true
     brightness: 80%
     command_spacing: 5ms
diff --git a/tests/components/nextion/common_tft_upload.yaml b/tests/components/nextion/common_tft_upload.yaml
index 190abbc7b1..70a0809883 100644
--- a/tests/components/nextion/common_tft_upload.yaml
+++ b/tests/components/nextion/common_tft_upload.yaml
@@ -1,5 +1,5 @@
 display:
-  - id: !extend main_lcd
+  - id: !extend nextion_main_lcd
     tft_url: http://esphome.io/default35.tft
     tft_upload_http_timeout: 20s
     tft_upload_http_retries: 10
diff --git a/tests/components/nextion/common_tft_upload_watchdog.yaml b/tests/components/nextion/common_tft_upload_watchdog.yaml
index 385fee359e..f0b44ce8c3 100644
--- a/tests/components/nextion/common_tft_upload_watchdog.yaml
+++ b/tests/components/nextion/common_tft_upload_watchdog.yaml
@@ -1,3 +1,3 @@
 display:
-  - id: !extend main_lcd
+  - id: !extend nextion_main_lcd
     tft_upload_watchdog_timeout: 30s
diff --git a/tests/components/ntc/common.yaml b/tests/components/ntc/common.yaml
index 79ae7f601d..1be2c335bc 100644
--- a/tests/components/ntc/common.yaml
+++ b/tests/components/ntc/common.yaml
@@ -1,23 +1,23 @@
 sensor:
   - platform: adc
-    id: my_sensor
+    id: ntc_my_sensor
     pin: ${pin}
   - platform: resistance
-    sensor: my_sensor
+    sensor: ntc_my_sensor
     configuration: DOWNSTREAM
     resistor: 10kΩ
     reference_voltage: 3.3V
     name: Resistance
-    id: resist
+    id: ntc_resist
   - platform: ntc
-    sensor: resist
+    sensor: ntc_resist
     name: NTC Sensor
     calibration:
       b_constant: 3950
       reference_resistance: 10k
       reference_temperature: 25°C
   - platform: ntc
-    sensor: resist
+    sensor: ntc_resist
     name: NTC Sensor2
     calibration:
       - 10.0kOhm -> 25°C
diff --git a/tests/components/number/common.yaml b/tests/components/number/common.yaml
index c17c2dd5f8..b1a16ebfed 100644
--- a/tests/components/number/common.yaml
+++ b/tests/components/number/common.yaml
@@ -1,7 +1,7 @@
 number:
   - platform: template
     name: "Test Number"
-    id: test_number
+    id: number_test_number
     optimistic: true
     min_value: 0
     max_value: 100
@@ -10,4 +10,4 @@ number:
 sensor:
   - platform: number
     name: "Test Number Value"
-    source_id: test_number
+    source_id: number_test_number
diff --git a/tests/components/online_image/common-esp32.yaml b/tests/components/online_image/common-esp32.yaml
index 32c909d351..ee4c1ed0b8 100644
--- a/tests/components/online_image/common-esp32.yaml
+++ b/tests/components/online_image/common-esp32.yaml
@@ -6,7 +6,7 @@ packages:
 display:
   - platform: ili9xxx
     spi_id: spi_bus
-    id: main_lcd
+    id: online_image_main_lcd
     model: ili9342
     cs_pin: 20
     dc_pin: 13
diff --git a/tests/components/online_image/common-esp8266.yaml b/tests/components/online_image/common-esp8266.yaml
index d7722d171a..fc61aad92e 100644
--- a/tests/components/online_image/common-esp8266.yaml
+++ b/tests/components/online_image/common-esp8266.yaml
@@ -6,7 +6,7 @@ packages:
 display:
   - platform: ili9xxx
     spi_id: spi_bus
-    id: main_lcd
+    id: online_image_main_lcd
     model: ili9342
     cs_pin: 15
     dc_pin: 3
diff --git a/tests/components/online_image/common-rp2040.yaml b/tests/components/online_image/common-rp2040.yaml
index bbb514bded..4d2785f3e8 100644
--- a/tests/components/online_image/common-rp2040.yaml
+++ b/tests/components/online_image/common-rp2040.yaml
@@ -6,7 +6,7 @@ packages:
 display:
   - platform: ili9xxx
     spi_id: spi_bus
-    id: main_lcd
+    id: online_image_main_lcd
     model: ili9342
     data_rate: 20MHz
     cs_pin: 20
diff --git a/tests/components/online_image/test.esp32-s3-ard.yaml b/tests/components/online_image/test.esp32-s3-ard.yaml
index 9116fd86e0..9972a673c0 100644
--- a/tests/components/online_image/test.esp32-s3-ard.yaml
+++ b/tests/components/online_image/test.esp32-s3-ard.yaml
@@ -8,7 +8,7 @@ http_request:
 display:
   - platform: ili9xxx
     spi_id: spi_bus
-    id: main_lcd
+    id: online_image_main_lcd
     model: ili9342
     cs_pin: 20
     dc_pin: 13
diff --git a/tests/components/online_image/test.esp32-s3-idf.yaml b/tests/components/online_image/test.esp32-s3-idf.yaml
index f219f71ee2..1f1485fd6c 100644
--- a/tests/components/online_image/test.esp32-s3-idf.yaml
+++ b/tests/components/online_image/test.esp32-s3-idf.yaml
@@ -8,7 +8,7 @@ http_request:
 display:
   - platform: ili9xxx
     spi_id: spi_bus
-    id: main_lcd
+    id: online_image_main_lcd
     model: ili9342
     cs_pin: 20
     dc_pin: 13
diff --git a/tests/components/output/common.yaml b/tests/components/output/common.yaml
index 81d802e9bf..df20dcde2b 100644
--- a/tests/components/output/common.yaml
+++ b/tests/components/output/common.yaml
@@ -1,19 +1,19 @@
 esphome:
   on_boot:
     then:
-      - output.turn_off: light_output_1
-      - output.turn_on: light_output_1
+      - output.turn_off: output_light_output_1
+      - output.turn_on: output_light_output_1
       - output.set_level:
-          id: light_output_1
+          id: output_light_output_1
           level: 50%
       - output.set_min_power:
-          id: light_output_1
+          id: output_light_output_1
           min_power: 20%
       - output.set_max_power:
-          id: light_output_1
+          id: output_light_output_1
           max_power: 80%
 
 output:
   - platform: ${output_platform}
-    id: light_output_1
+    id: output_light_output_1
     pin: ${pin}
diff --git a/tests/components/pi4ioe5v6408/common.yaml b/tests/components/pi4ioe5v6408/common.yaml
index 77a77fa3e4..aeda76d35c 100644
--- a/tests/components/pi4ioe5v6408/common.yaml
+++ b/tests/components/pi4ioe5v6408/common.yaml
@@ -9,7 +9,7 @@ pi4ioe5v6408:
 
 switch:
   - platform: gpio
-    id: switch1
+    id: pi4ioe5v6408_switch1
     pin:
       pi4ioe5v6408: pi4ioe1
       number: 0
diff --git a/tests/components/pid/common.yaml b/tests/components/pid/common.yaml
index 262e75591e..320e5f775f 100644
--- a/tests/components/pid/common.yaml
+++ b/tests/components/pid/common.yaml
@@ -23,7 +23,7 @@ output:
 
 sensor:
   - platform: template
-    id: template_sensor1
+    id: pid_template_sensor1
     lambda: |-
       if (millis() > 10000) {
         return 42.0;
@@ -35,8 +35,8 @@ climate:
   - platform: pid
     id: pid_climate
     name: PID Climate Controller
-    sensor: template_sensor1
-    humidity_sensor: template_sensor1
+    sensor: pid_template_sensor1
+    humidity_sensor: pid_template_sensor1
     default_target_temperature: 21°C
     heat_output: pid_slow_pwm
     control_parameters:
diff --git a/tests/components/prometheus/common.yaml b/tests/components/prometheus/common.yaml
index 7ff416dccb..951d8f7fc5 100644
--- a/tests/components/prometheus/common.yaml
+++ b/tests/components/prometheus/common.yaml
@@ -31,7 +31,7 @@ update:
 
 sensor:
   - platform: template
-    id: template_sensor1
+    id: prometheus_template_sensor1
     lambda: |-
       if (millis() > 10000) {
         return 42.0;
@@ -91,7 +91,7 @@ binary_sensor:
 
 switch:
   - platform: template
-    id: template_switch1
+    id: prometheus_template_switch1
     lambda: |-
       if (millis() > 10000) {
         return true;
@@ -185,7 +185,7 @@ climate:
 prometheus:
   include_internal: true
   relabel:
-    template_sensor1:
+    prometheus_template_sensor1:
       id: hellow_world
       name: Hello World
     template_text_sensor1:
diff --git a/tests/components/qspi_dbi/common.yaml b/tests/components/qspi_dbi/common.yaml
index 109db65b63..0eadfa7392 100644
--- a/tests/components/qspi_dbi/common.yaml
+++ b/tests/components/qspi_dbi/common.yaml
@@ -16,7 +16,7 @@ display:
 
   - platform: qspi_dbi
     model: CUSTOM
-    id: main_lcd
+    id: qspi_dbi_main_lcd
     draw_from_origin: true
     dimensions:
       height: 240
diff --git a/tests/components/remote_transmitter/common-buttons.yaml b/tests/components/remote_transmitter/common-buttons.yaml
index c6c7049605..5631c48f95 100644
--- a/tests/components/remote_transmitter/common-buttons.yaml
+++ b/tests/components/remote_transmitter/common-buttons.yaml
@@ -1,6 +1,6 @@
 number:
   - platform: template
-    id: test_number
+    id: remote_transmitter_test_number
     optimistic: true
     min_value: 0
     max_value: 255
@@ -151,7 +151,7 @@ button:
     on_press:
       remote_transmitter.transmit_raw:
         code: !lambda |-
-          return {(int32_t)id(test_number).state * 100, -1000};
+          return {(int32_t)id(remote_transmitter_test_number).state * 100, -1000};
   - platform: template
     name: AEHA
     id: eaha_hitachi_climate_power_on
@@ -253,7 +253,7 @@ button:
         destination_address: 0x5678
         message_type: 0x01
         data: !lambda |-
-          return {(uint8_t)id(test_number).state, 0x20, 0x30};
+          return {(uint8_t)id(remote_transmitter_test_number).state, 0x20, 0x30};
   - platform: template
     name: Digital Write
     on_press:
diff --git a/tests/components/resistance/common.yaml b/tests/components/resistance/common.yaml
index b3eec49548..8966b574df 100644
--- a/tests/components/resistance/common.yaml
+++ b/tests/components/resistance/common.yaml
@@ -1,11 +1,11 @@
 sensor:
   - platform: adc
-    id: my_sensor
+    id: resistance_my_sensor
     pin: ${pin}
   - platform: resistance
-    sensor: my_sensor
+    sensor: resistance_my_sensor
     configuration: DOWNSTREAM
     resistor: 10kΩ
     reference_voltage: 3.3V
     name: Resistance
-    id: resist
+    id: resistance_resist
diff --git a/tests/components/rgb/common.yaml b/tests/components/rgb/common.yaml
index 9f25efa431..bd72abbd17 100644
--- a/tests/components/rgb/common.yaml
+++ b/tests/components/rgb/common.yaml
@@ -1,9 +1,9 @@
 output:
   - platform: ${light_platform}
-    id: light_output_1
+    id: rgb_light_output_1
     pin: ${pin1}
   - platform: ${light_platform}
-    id: light_output_2
+    id: rgb_light_output_2
     pin: ${pin2}
   - platform: ${light_platform}
     id: light_output_3
@@ -13,6 +13,6 @@ light:
   - platform: rgb
     name: RGB Light
     id: rgb_light
-    red: light_output_1
-    green: light_output_2
+    red: rgb_light_output_1
+    green: rgb_light_output_2
     blue: light_output_3
diff --git a/tests/components/rgbct/common.yaml b/tests/components/rgbct/common.yaml
index 65bb248e95..46d8082706 100644
--- a/tests/components/rgbct/common.yaml
+++ b/tests/components/rgbct/common.yaml
@@ -1,9 +1,9 @@
 output:
   - platform: ${light_platform}
-    id: light_output_1
+    id: rgbct_light_output_1
     pin: ${pin1}
   - platform: ${light_platform}
-    id: light_output_2
+    id: rgbct_light_output_2
     pin: ${pin2}
   - platform: ${light_platform}
     id: light_output_3
@@ -18,8 +18,8 @@ output:
 light:
   - platform: rgbct
     name: RGBCT Light
-    red: light_output_1
-    green: light_output_2
+    red: rgbct_light_output_1
+    green: rgbct_light_output_2
     blue: light_output_3
     color_temperature: light_output_4
     white_brightness: light_output_5
diff --git a/tests/components/rgbw/common.yaml b/tests/components/rgbw/common.yaml
index b0f44869d3..4a8e56a255 100644
--- a/tests/components/rgbw/common.yaml
+++ b/tests/components/rgbw/common.yaml
@@ -1,9 +1,9 @@
 output:
   - platform: ${light_platform}
-    id: light_output_1
+    id: rgbw_light_output_1
     pin: ${pin1}
   - platform: ${light_platform}
-    id: light_output_2
+    id: rgbw_light_output_2
     pin: ${pin2}
   - platform: ${light_platform}
     id: light_output_3
@@ -15,8 +15,8 @@ output:
 light:
   - platform: rgbw
     name: RGBW Light
-    red: light_output_1
-    green: light_output_2
+    red: rgbw_light_output_1
+    green: rgbw_light_output_2
     blue: light_output_3
     white: light_output_4
     color_interlock: true
diff --git a/tests/components/rgbww/common.yaml b/tests/components/rgbww/common.yaml
index 0013960c10..bb1d73b3bc 100644
--- a/tests/components/rgbww/common.yaml
+++ b/tests/components/rgbww/common.yaml
@@ -1,9 +1,9 @@
 output:
   - platform: ${light_platform}
-    id: light_output_1
+    id: rgbww_light_output_1
     pin: ${pin1}
   - platform: ${light_platform}
-    id: light_output_2
+    id: rgbww_light_output_2
     pin: ${pin2}
   - platform: ${light_platform}
     id: light_output_3
@@ -18,8 +18,8 @@ output:
 light:
   - platform: rgbww
     name: RGBWW Light
-    red: light_output_1
-    green: light_output_2
+    red: rgbww_light_output_1
+    green: rgbww_light_output_2
     blue: light_output_3
     cold_white: light_output_4
     warm_white: light_output_5
diff --git a/tests/components/rp2040_pio_led_strip/common.yaml b/tests/components/rp2040_pio_led_strip/common.yaml
index b9b1436cdb..254ac0e13d 100644
--- a/tests/components/rp2040_pio_led_strip/common.yaml
+++ b/tests/components/rp2040_pio_led_strip/common.yaml
@@ -1,6 +1,6 @@
 light:
   - platform: rp2040_pio_led_strip
-    id: led_strip
+    id: rp2040_pio_led_strip_led_strip
     pin: 4
     num_leds: 60
     pio: 0
diff --git a/tests/components/rp2040_pwm/common.yaml b/tests/components/rp2040_pwm/common.yaml
index 45c039106f..2970a48afb 100644
--- a/tests/components/rp2040_pwm/common.yaml
+++ b/tests/components/rp2040_pwm/common.yaml
@@ -1,7 +1,7 @@
 output:
   - platform: rp2040_pwm
-    id: light_output_1
+    id: rp2040_pwm_light_output_1
     pin: 2
   - platform: rp2040_pwm
-    id: light_output_2
+    id: rp2040_pwm_light_output_2
     pin: 3
diff --git a/tests/components/sdl/common.yaml b/tests/components/sdl/common.yaml
index d3d3c9ee5e..3be86cf8be 100644
--- a/tests/components/sdl/common.yaml
+++ b/tests/components/sdl/common.yaml
@@ -3,7 +3,7 @@ host:
 
 display:
   - platform: sdl
-    id: sdl_display
+    id: sdl_sdl_display
     update_interval: 1s
     auto_clear_enabled: false
     show_test_card: true
@@ -35,14 +35,14 @@ display:
 
 binary_sensor:
   - platform: sdl
-    sdl_id: sdl_display
+    sdl_id: sdl_sdl_display
     id: key_up
     key: SDLK_UP
   - platform: sdl
-    sdl_id: sdl_display
+    sdl_id: sdl_sdl_display
     id: key_down
     key: SDLK_DOWN
   - platform: sdl
-    sdl_id: sdl_display
+    sdl_id: sdl_sdl_display
     id: key_enter
     key: SDLK_RETURN
diff --git a/tests/components/speaker/common.yaml b/tests/components/speaker/common.yaml
index 895f4b4b8f..96f459c53f 100644
--- a/tests/components/speaker/common.yaml
+++ b/tests/components/speaker/common.yaml
@@ -1,7 +1,7 @@
 number:
   - platform: template
     name: "Speaker Number"
-    id: my_number
+    id: speaker_my_number
     optimistic: true
     min_value: 0
     max_value: 100
@@ -46,7 +46,7 @@ button:
         - speaker.play:
             id: speaker_id
             data: !lambda |-
-              return {0x01, 0x02, (uint8_t)id(my_number).state};
+              return {0x01, 0x02, (uint8_t)id(speaker_my_number).state};
 
 speaker:
   - platform: i2s_audio
diff --git a/tests/components/speed/common.yaml b/tests/components/speed/common.yaml
index be8172af7e..70c91259ba 100644
--- a/tests/components/speed/common.yaml
+++ b/tests/components/speed/common.yaml
@@ -1,9 +1,9 @@
 output:
   - platform: ${output_platform}
-    id: fan_output_1
+    id: speed_fan_output_1
     pin: ${pin}
 
 fan:
   - platform: speed
-    id: fan_speed
-    output: fan_output_1
+    id: speed_fan_speed
+    output: speed_fan_output_1
diff --git a/tests/components/sprinkler/common.yaml b/tests/components/sprinkler/common.yaml
index f099f77729..dbe109f524 100644
--- a/tests/components/sprinkler/common.yaml
+++ b/tests/components/sprinkler/common.yaml
@@ -34,7 +34,7 @@ esphome:
 
 switch:
   - platform: template
-    id: switch1
+    id: sprinkler_switch1
     optimistic: true
   - platform: template
     id: switch2
@@ -52,17 +52,17 @@ sprinkler:
     valves:
       - valve_switch: Yard Valve 0
         enable_switch: Enable Yard Valve 0
-        pump_switch_id: switch1
+        pump_switch_id: sprinkler_switch1
         run_duration: 10s
         valve_switch_id: switch2
       - valve_switch: Yard Valve 1
         enable_switch: Enable Yard Valve 1
-        pump_switch_id: switch1
+        pump_switch_id: sprinkler_switch1
         run_duration: 10s
         valve_switch_id: switch2
       - valve_switch: Yard Valve 2
         enable_switch: Enable Yard Valve 2
-        pump_switch_id: switch1
+        pump_switch_id: sprinkler_switch1
         run_duration: 10s
         valve_switch_id: switch2
   - id: garden_sprinkler_ctrlr
@@ -73,11 +73,11 @@ sprinkler:
     valves:
       - valve_switch: Garden Valve 0
         enable_switch: Enable Garden Valve 0
-        pump_switch_id: switch1
+        pump_switch_id: sprinkler_switch1
         run_duration: 10s
         valve_switch_id: switch2
       - valve_switch: Garden Valve 1
         enable_switch: Enable Garden Valve 1
-        pump_switch_id: switch1
+        pump_switch_id: sprinkler_switch1
         run_duration: 10s
         valve_switch_id: switch2
diff --git a/tests/components/ssd1306_i2c/common.yaml b/tests/components/ssd1306_i2c/common.yaml
index 09eb569a8e..b3b8ad85dc 100644
--- a/tests/components/ssd1306_i2c/common.yaml
+++ b/tests/components/ssd1306_i2c/common.yaml
@@ -4,7 +4,7 @@ display:
     model: SSD1306_128X64
     reset_pin: ${reset_pin}
     address: 0x3C
-    id: ssd1306_i2c_display
+    id: ssd1306_i2c_ssd1306_i2c_display
     contrast: 60%
     pages:
       - id: ssd1306_i2c_page1
diff --git a/tests/components/switch/common.yaml b/tests/components/switch/common.yaml
index afdf26c150..3ea235cfb9 100644
--- a/tests/components/switch/common.yaml
+++ b/tests/components/switch/common.yaml
@@ -1,6 +1,6 @@
 binary_sensor:
   - platform: switch
-    id: some_binary_sensor
+    id: switch_some_binary_sensor
     name: "Template Switch State"
     source_id: the_switch
 
diff --git a/tests/components/sx126x/common.yaml b/tests/components/sx126x/common.yaml
index 659550cc01..a4a24d8da7 100644
--- a/tests/components/sx126x/common.yaml
+++ b/tests/components/sx126x/common.yaml
@@ -29,7 +29,7 @@ sx126x:
 number:
   - platform: template
     name: "SX126x Number"
-    id: my_number
+    id: sx126x_my_number
     optimistic: true
     min_value: 0
     max_value: 100
@@ -47,4 +47,4 @@ button:
         - sx126x.send_packet:
             data: [0xC5, 0x51, 0x78, 0x82, 0xB7, 0xF9, 0x9C, 0x5C]
         - sx126x.send_packet: !lambda |-
-            return {0x01, 0x02, (uint8_t)id(my_number).state};
+            return {0x01, 0x02, (uint8_t)id(sx126x_my_number).state};
diff --git a/tests/components/sx127x/common.yaml b/tests/components/sx127x/common.yaml
index 6e48952fcc..b7eadc084f 100644
--- a/tests/components/sx127x/common.yaml
+++ b/tests/components/sx127x/common.yaml
@@ -29,7 +29,7 @@ sx127x:
 number:
   - platform: template
     name: "SX127x Number"
-    id: my_number
+    id: sx127x_my_number
     optimistic: true
     min_value: 0
     max_value: 100
@@ -48,4 +48,4 @@ button:
         - sx127x.send_packet:
             data: [0xC5, 0x51, 0x78, 0x82, 0xB7, 0xF9, 0x9C, 0x5C]
         - sx127x.send_packet: !lambda |-
-            return {0x01, 0x02, (uint8_t)id(my_number).state};
+            return {0x01, 0x02, (uint8_t)id(sx127x_my_number).state};
diff --git a/tests/components/template/common-base.yaml b/tests/components/template/common-base.yaml
index d3985a848b..f1387a7afe 100644
--- a/tests/components/template/common-base.yaml
+++ b/tests/components/template/common-base.yaml
@@ -52,7 +52,7 @@ esphome:
 
 binary_sensor:
   - platform: template
-    id: some_binary_sensor
+    id: template_some_binary_sensor
     name: "Garage Door Open"
     lambda: |-
       if (id(template_sens).state > 30) {
@@ -108,7 +108,7 @@ sensor:
     name: "Template Sensor"
     id: template_sens
     lambda: |-
-      if (id(some_binary_sensor).state) {
+      if (id(template_some_binary_sensor).state) {
         return 42.0;
       }
       return 0.0;
@@ -230,7 +230,7 @@ switch:
     id: test_switch
     name: "Template Switch"
     lambda: |-
-      if (id(some_binary_sensor).state) {
+      if (id(template_some_binary_sensor).state) {
         return true;
       }
       return false;
@@ -249,7 +249,7 @@ cover:
   - platform: template
     name: "Template Cover"
     lambda: |-
-      if (id(some_binary_sensor).state) {
+      if (id(template_some_binary_sensor).state) {
         return COVER_OPEN;
       }
       return COVER_CLOSED;
@@ -264,7 +264,7 @@ cover:
     name: "Template Cover with Triggers"
     id: template_cover_with_triggers
     lambda: |-
-      if (id(some_binary_sensor).state) {
+      if (id(template_some_binary_sensor).state) {
         return COVER_OPEN;
       }
       return COVER_CLOSED;
@@ -442,7 +442,7 @@ lock:
   - platform: template
     name: "Template Lock"
     lambda: |-
-      if (id(some_binary_sensor).state) {
+      if (id(template_some_binary_sensor).state) {
         return LOCK_STATE_LOCKED;
       }
       return LOCK_STATE_UNLOCKED;
@@ -458,7 +458,7 @@ valve:
     id: template_valve
     name: "Template Valve"
     lambda: |-
-      if (id(some_binary_sensor).state) {
+      if (id(template_some_binary_sensor).state) {
         return VALVE_OPEN;
       }
       return VALVE_CLOSED;
diff --git a/tests/components/tt21100/common.yaml b/tests/components/tt21100/common.yaml
index 56089aed1e..1f9249f1ba 100644
--- a/tests/components/tt21100/common.yaml
+++ b/tests/components/tt21100/common.yaml
@@ -1,7 +1,7 @@
 display:
   - platform: ssd1306_i2c
     i2c_id: i2c_bus
-    id: ssd1306_i2c_display
+    id: tt21100_ssd1306_i2c_display
     model: SSD1306_128X64
     reset_pin: ${disp_reset_pin}
     pages:
@@ -13,7 +13,7 @@ touchscreen:
   - platform: tt21100
     i2c_id: i2c_bus
     id: tt21100_touchscreen
-    display: ssd1306_i2c_display
+    display: tt21100_ssd1306_i2c_display
     interrupt_pin: ${interrupt_pin}
     reset_pin: ${reset_pin}
 
diff --git a/tests/components/uart/test.esp32-idf.yaml b/tests/components/uart/test.esp32-idf.yaml
index fa76316b9c..c805188005 100644
--- a/tests/components/uart/test.esp32-idf.yaml
+++ b/tests/components/uart/test.esp32-idf.yaml
@@ -79,7 +79,7 @@ switch:
 number:
   - platform: template
     name: "Test Number"
-    id: test_number
+    id: uart_test_number
     optimistic: true
     min_value: 0
     max_value: 100
@@ -103,7 +103,7 @@ button:
       - uart.write:
           id: uart_id
           data: !lambda |-
-            std::string cmd = "VALUE=" + str_sprintf("%.0f", id(test_number).state) + "\r\n";
+            std::string cmd = "VALUE=" + str_sprintf("%.0f", id(uart_test_number).state) + "\r\n";
             return std::vector<uint8_t>(cmd.begin(), cmd.end());
 
 event:
diff --git a/tests/components/udp/common.yaml b/tests/components/udp/common.yaml
index a40ca455cb..6824c5cca8 100644
--- a/tests/components/udp/common.yaml
+++ b/tests/components/udp/common.yaml
@@ -24,7 +24,7 @@ udp:
 number:
   - platform: template
     name: "UDP Number"
-    id: my_number
+    id: udp_my_number
     optimistic: true
     min_value: 0
     max_value: 100
@@ -38,4 +38,4 @@ button:
         - udp.write:
             data: [0x01, 0x02, 0x03]
         - udp.write: !lambda |-
-            return {0x10, 0x20, (uint8_t)id(my_number).state};
+            return {0x10, 0x20, (uint8_t)id(udp_my_number).state};
diff --git a/tests/components/ufire_ec/common.yaml b/tests/components/ufire_ec/common.yaml
index 4260f0ab4c..2365b7a368 100644
--- a/tests/components/ufire_ec/common.yaml
+++ b/tests/components/ufire_ec/common.yaml
@@ -4,18 +4,18 @@ esphome:
       - ufire_ec.calibrate_probe:
           id: ufire_ec_board
           solution: 0.146
-          temperature: !lambda "return id(test_sensor).state;"
+          temperature: !lambda "return id(ufire_ec_test_sensor).state;"
       - ufire_ec.reset:
 
 sensor:
   - platform: template
-    id: test_sensor
+    id: ufire_ec_test_sensor
     lambda: "return 21;"
   - platform: ufire_ec
     i2c_id: i2c_bus
     id: ufire_ec_board
     ec:
       name: Ufire EC
-    temperature_sensor: test_sensor
+    temperature_sensor: ufire_ec_test_sensor
     temperature_compensation: 20.0
     temperature_coefficient: 0.019
diff --git a/tests/components/ufire_ise/common.yaml b/tests/components/ufire_ise/common.yaml
index f7865ea87b..478c75ad37 100644
--- a/tests/components/ufire_ise/common.yaml
+++ b/tests/components/ufire_ise/common.yaml
@@ -11,11 +11,11 @@ esphome:
 
 sensor:
   - platform: template
-    id: test_sensor
+    id: ufire_ise_test_sensor
     lambda: "return 21;"
   - platform: ufire_ise
     i2c_id: i2c_bus
     id: ufire_ise_sensor
-    temperature_sensor: test_sensor
+    temperature_sensor: ufire_ise_test_sensor
     ph:
       name: Ufire pH
diff --git a/tests/components/web_server_idf/common.yaml b/tests/components/web_server_idf/common.yaml
index b1885af266..cfba0060d9 100644
--- a/tests/components/web_server_idf/common.yaml
+++ b/tests/components/web_server_idf/common.yaml
@@ -12,7 +12,7 @@ network:
 sensor:
   - platform: template
     name: "Test Sensor"
-    id: test_sensor
+    id: web_server_idf_test_sensor
     update_interval: 60s
     lambda: "return 42.5;"
 
@@ -25,5 +25,5 @@ binary_sensor:
 switch:
   - platform: template
     name: "Test Switch"
-    id: test_switch
+    id: web_server_idf_test_switch
     optimistic: true
diff --git a/tests/components/wk2132_i2c/common.yaml b/tests/components/wk2132_i2c/common.yaml
index 39013baeb2..93bb17b38f 100644
--- a/tests/components/wk2132_i2c/common.yaml
+++ b/tests/components/wk2132_i2c/common.yaml
@@ -16,4 +16,4 @@ wk2132_i2c:
 sensor:
   - platform: a02yyuw
     uart_id: wk2132_id_1
-    id: distance_sensor
+    id: wk2132_i2c_distance_sensor
diff --git a/tests/components/wk2132_spi/common.yaml b/tests/components/wk2132_spi/common.yaml
index 18294974b9..5ff48bc64c 100644
--- a/tests/components/wk2132_spi/common.yaml
+++ b/tests/components/wk2132_spi/common.yaml
@@ -17,4 +17,4 @@ wk2132_spi:
 sensor:
   - platform: a02yyuw
     uart_id: wk2132_spi_uart1
-    id: distance_sensor
+    id: wk2132_spi_distance_sensor
diff --git a/tests/components/wk2168_i2c/common.yaml b/tests/components/wk2168_i2c/common.yaml
index 49f0d1ec6b..1b2de74c02 100644
--- a/tests/components/wk2168_i2c/common.yaml
+++ b/tests/components/wk2168_i2c/common.yaml
@@ -23,7 +23,7 @@ wk2168_i2c:
 sensor:
   - platform: a02yyuw
     uart_id: wk2168_i2c_uart3
-    id: distance_sensor
+    id: wk2168_i2c_distance_sensor
 
 # individual binary_sensor inputs
 binary_sensor:
diff --git a/tests/components/wk2168_spi/common.yaml b/tests/components/wk2168_spi/common.yaml
index b402077aa3..a21a4a34d0 100644
--- a/tests/components/wk2168_spi/common.yaml
+++ b/tests/components/wk2168_spi/common.yaml
@@ -23,7 +23,7 @@ wk2168_spi:
 sensor:
   - platform: a02yyuw
     uart_id: wk2168_spi_uart3
-    id: distance_sensor
+    id: wk2168_spi_distance_sensor
 
 # individual binary_sensor inputs
 binary_sensor:
diff --git a/tests/components/wk2204_i2c/common.yaml b/tests/components/wk2204_i2c/common.yaml
index 863633937b..55c67efd88 100644
--- a/tests/components/wk2204_i2c/common.yaml
+++ b/tests/components/wk2204_i2c/common.yaml
@@ -24,4 +24,4 @@ wk2204_i2c:
 sensor:
   - platform: a02yyuw
     uart_id: wk2204_id_3
-    id: distance_sensor
+    id: wk2204_i2c_distance_sensor
diff --git a/tests/components/wk2204_spi/common.yaml b/tests/components/wk2204_spi/common.yaml
index 0b62a7a009..ee00da22bb 100644
--- a/tests/components/wk2204_spi/common.yaml
+++ b/tests/components/wk2204_spi/common.yaml
@@ -25,4 +25,4 @@ wk2204_spi:
 sensor:
   - platform: a02yyuw
     uart_id: wk2204_spi_uart3
-    id: distance_sensor
+    id: wk2204_spi_distance_sensor
diff --git a/tests/components/wk2212_i2c/common.yaml b/tests/components/wk2212_i2c/common.yaml
index a754bec5c7..d48063bb4d 100644
--- a/tests/components/wk2212_i2c/common.yaml
+++ b/tests/components/wk2212_i2c/common.yaml
@@ -19,7 +19,7 @@ wk2212_i2c:
 sensor:
   - platform: a02yyuw
     uart_id: uart_i2c_id1
-    id: distance_sensor
+    id: wk2212_i2c_distance_sensor
 
 # individual binary_sensor inputs
 binary_sensor:
diff --git a/tests/components/wk2212_spi/common.yaml b/tests/components/wk2212_spi/common.yaml
index 969f16bb12..d17db2f676 100644
--- a/tests/components/wk2212_spi/common.yaml
+++ b/tests/components/wk2212_spi/common.yaml
@@ -17,7 +17,7 @@ wk2212_spi:
 sensor:
   - platform: a02yyuw
     uart_id: wk2212_spi_uart1
-    id: distance_sensor
+    id: wk2212_spi_distance_sensor
 
 # individual binary_sensor inputs
 binary_sensor:
diff --git a/tests/script/test_merge_component_configs.py b/tests/script/test_merge_component_configs.py
new file mode 100644
index 0000000000..9286380de1
--- /dev/null
+++ b/tests/script/test_merge_component_configs.py
@@ -0,0 +1,72 @@
+"""Unit tests for script/merge_component_configs.py deduplication."""
+
+from pathlib import Path
+import sys
+
+import pytest
+
+# Add the script directory to Python path so we can import the module
+sys.path.insert(0, str((Path(__file__).parent / ".." / ".." / "script").resolve()))
+
+import merge_component_configs  # noqa: E402
+
+deduplicate_by_id = merge_component_configs.deduplicate_by_id
+
+
+def test_identical_duplicate_ids_collapse() -> None:
+    """Two identical items sharing an id collapse to one without error."""
+    data = {
+        "sensor": [
+            {"id": "shared", "platform": "template", "name": "A"},
+            {"id": "shared", "platform": "template", "name": "A"},
+        ]
+    }
+    result = deduplicate_by_id(data)
+    assert result["sensor"] == [{"id": "shared", "platform": "template", "name": "A"}]
+
+
+def test_conflicting_duplicate_ids_raise() -> None:
+    """Two different items sharing an id is a hard error naming the id."""
+    data = {
+        "sensor": [
+            {"id": "dup", "platform": "template", "name": "A"},
+            {"id": "dup", "platform": "template", "name": "B"},
+        ]
+    }
+    with pytest.raises(ValueError, match="dup"):
+        deduplicate_by_id(data)
+
+
+def test_intentionally_shared_id_does_not_raise() -> None:
+    """Allowlisted singleton ids may differ across components and collapse."""
+    shared = next(iter(merge_component_configs.INTENTIONALLY_SHARED_IDS))
+    data = {
+        "time": [
+            {"id": shared, "platform": "sntp"},
+            {"id": shared, "platform": "sntp", "servers": ["a"]},
+        ]
+    }
+    result = deduplicate_by_id(data)
+    # First occurrence wins, no error raised
+    assert result["time"] == [{"id": shared, "platform": "sntp"}]
+
+
+def test_items_without_id_are_preserved() -> None:
+    """Items lacking an id are passed through untouched."""
+    data = {"binary_sensor": [{"platform": "gpio"}, {"platform": "gpio"}]}
+    result = deduplicate_by_id(data)
+    assert result["binary_sensor"] == [{"platform": "gpio"}, {"platform": "gpio"}]
+
+
+def test_nested_lists_are_checked() -> None:
+    """Conflicts nested inside dict values are also detected."""
+    data = {
+        "wrapper": {
+            "sensor": [
+                {"id": "dup", "value": 1},
+                {"id": "dup", "value": 2},
+            ]
+        }
+    }
+    with pytest.raises(ValueError, match="dup"):
+        deduplicate_by_id(data)