Support asking covers to stop using google assistant (#43537)

tests/components/google_assistant/test_trait.py

@@ -384,6 +384,51 @@ async def test_startstop_vacuum(hass):
     assert unpause_calls[0].data == {ATTR_ENTITY_ID: "vacuum.bla"}
 
 
+async def test_startstop_covert(hass):
+    """Test startStop trait support for vacuum domain."""
+    assert helpers.get_google_type(cover.DOMAIN, None) is not None
+    assert trait.StartStopTrait.supported(cover.DOMAIN, cover.SUPPORT_STOP, None)
+
+    state = State(
+        "cover.bla",
+        cover.STATE_CLOSED,
+        {ATTR_SUPPORTED_FEATURES: cover.SUPPORT_STOP},
+    )
+
+    trt = trait.StartStopTrait(
+        hass,
+        state,
+        BASIC_CONFIG,
+    )
+
+    assert trt.sync_attributes() == {}
+
+    for state_value in (cover.STATE_CLOSING, cover.STATE_OPENING):
+        state.state = state_value
+        assert trt.query_attributes() == {"isRunning": True}
+
+    stop_calls = async_mock_service(hass, cover.DOMAIN, cover.SERVICE_STOP_COVER)
+    await trt.execute(trait.COMMAND_STARTSTOP, BASIC_DATA, {"start": False}, {})
+    assert len(stop_calls) == 1
+    assert stop_calls[0].data == {ATTR_ENTITY_ID: "cover.bla"}
+
+    for state_value in (cover.STATE_CLOSED, cover.STATE_OPEN):
+        state.state = state_value
+        assert trt.query_attributes() == {"isRunning": False}
+
+    with pytest.raises(SmartHomeError, match="Cover is already stopped"):
+        await trt.execute(trait.COMMAND_STARTSTOP, BASIC_DATA, {"start": False}, {})
+
+    with pytest.raises(SmartHomeError, match="Starting a cover is not supported"):
+        await trt.execute(trait.COMMAND_STARTSTOP, BASIC_DATA, {"start": True}, {})
+
+    with pytest.raises(
+        SmartHomeError,
+        match="Command action.devices.commands.PauseUnpause is not supported",
+    ):
+        await trt.execute(trait.COMMAND_PAUSEUNPAUSE, BASIC_DATA, {"start": True}, {})
+
+
 async def test_color_setting_color_light(hass):
     """Test ColorSpectrum trait support for light domain."""
     assert helpers.get_google_type(light.DOMAIN, None) is not None