Add device action support for remotes (#39400)

tests/testing_config/custom_components/test/remote.py

@@ -0,0 +1,39 @@
+"""
+Provide a mock remote platform.
+
+Call init before using it in your tests to ensure clean test data.
+"""
+from homeassistant.components.remote import RemoteEntity
+from homeassistant.const import STATE_OFF, STATE_ON
+
+from tests.common import MockToggleEntity
+
+ENTITIES = []
+
+
+def init(empty=False):
+    """Initialize the platform with entities."""
+    global ENTITIES
+
+    ENTITIES = (
+        []
+        if empty
+        else [
+            MockRemote("TV", STATE_ON),
+            MockRemote("DVD", STATE_OFF),
+            MockRemote(None, STATE_OFF),
+        ]
+    )
+
+
+async def async_setup_platform(
+    hass, config, async_add_entities_callback, discovery_info=None
+):
+    """Return mock entities."""
+    async_add_entities_callback(ENTITIES)
+
+
+class MockRemote(MockToggleEntity, RemoteEntity):
+    """Mock remote class."""
+
+    supported_features = 0