[remote_base] Compile only the protocol sources a configuration uses

tests/component_tests/remote_receiver/test_slot_counts.py

@@ -3,6 +3,11 @@
 from collections.abc import Callable
 from pathlib import Path
 
+import pytest
+
+from esphome.components import remote_base
+import esphome.config_validation as cv
+
 from ..helpers import get_define_value
 
 
@@ -34,3 +39,44 @@ def test_proxy_receivers_count_as_listeners(
     # infrared and radio_frequency ir_rf_proxy platforms each listen
     assert get_define_value("REMOTE_BASE_LISTENER_COUNT") == "2"
     assert get_define_value("REMOTE_BASE_DUMPER_COUNT") is None
+
+
+def test_only_used_protocol_sources_are_compiled(
+    generate_main: Callable[[str | Path], str],
+    component_config_path: Callable[[str], Path],
+) -> None:
+    generate_main(component_config_path("receiver_with_dumpers.yaml"))
+    excluded = set(remote_base.FILTER_SOURCE_FILES())
+    assert "nec_protocol.cpp" not in excluded
+    assert "rc_switch_protocol.cpp" not in excluded
+    assert "sony_protocol.cpp" in excluded
+    assert "remote_base.cpp" not in excluded
+
+
+def test_every_registry_name_maps_to_a_protocol_source() -> None:
+    sources = {
+        path.name for path in Path(remote_base.__file__).parent.glob("*_protocol.cpp")
+    }
+    names = (
+        set(remote_base.BINARY_SENSOR_REGISTRY)
+        | set(remote_base.DUMPER_REGISTRY)
+        | {key.removeprefix("on_") for key in remote_base.TRIGGER_REGISTRY}
+    )
+    for name in names:
+        stem = (
+            remote_base.protocol_define(name)
+            .removeprefix("USE_REMOTE_PROTOCOL_")
+            .lower()
+        )
+        assert f"{stem}_protocol.cpp" in sources, name
+
+
+def test_dump_list_is_deduplicated_across_forms() -> None:
+    dumpers = remote_base.validate_dumpers(["raw", {"raw": None}, "nec", "nec"])
+    assert [name for name, _ in dumpers] == ["raw", "nec"]
+
+
+@pytest.mark.parametrize("bad", [["nec", None], [5]])
+def test_dump_list_rejects_invalid_entries_with_a_validation_error(bad: list) -> None:
+    with pytest.raises(cv.Invalid):
+        remote_base.validate_dumpers(bad)