[remote_transmitter] ISR-driven transmission and non_blocking support on RTL8720C (#18648)

tests/component_tests/remote_transmitter/test_non_blocking_gate.py

@@ -0,0 +1,42 @@
+"""non_blocking is family-gated at config validation; the CI build boards never compile
+the ISR paths, so this gate is the only CI-reachable coverage for the platform matrix."""
+
+import pytest
+
+from esphome.components.libretiny.const import (
+    FAMILY_RTL8710B,
+    FAMILY_RTL8720C,
+    KEY_FAMILY,
+    KEY_LIBRETINY,
+)
+from esphome.components.remote_transmitter import _validate_non_blocking_platform
+import esphome.config_validation as cv
+from esphome.const import PlatformFramework
+from esphome.core import CORE
+
+from ..types import SetCoreConfigCallable
+
+
+@pytest.mark.parametrize(
+    ("platform_framework", "family", "accepted"),
+    [
+        (PlatformFramework.ESP32_IDF, None, True),
+        (PlatformFramework.RTL87XX_ARDUINO, FAMILY_RTL8720C, True),
+        (PlatformFramework.RTL87XX_ARDUINO, FAMILY_RTL8710B, False),
+        (PlatformFramework.ESP8266_ARDUINO, None, False),
+    ],
+)
+def test_non_blocking_platform_gate(
+    set_core_config: SetCoreConfigCallable,
+    platform_framework: PlatformFramework,
+    family: str | None,
+    accepted: bool,
+) -> None:
+    set_core_config(platform_framework)
+    if family is not None:
+        CORE.data[KEY_LIBRETINY] = {KEY_FAMILY: family}
+    if accepted:
+        assert _validate_non_blocking_platform(True) is True
+    else:
+        with pytest.raises(cv.Invalid, match="non_blocking is only supported on"):
+            _validate_non_blocking_platform(True)

tests/components/remote_transmitter/test.rtl87xx-ard.yaml

@@ -2,6 +2,7 @@ remote_transmitter:
   id: xmitr
   pin: GPIO12
   carrier_duty_percent: 50%
+  # non_blocking is rtl8720c-only; the CI board is an RTL8710B
 
 packages:
   buttons: !include common-buttons.yaml