Fix shades and keen vents (#104)

Co-authored-by: TheJulianJES <[email protected]>

tests/test_cover.py

@@ -578,6 +578,10 @@ async def test_shade(
         | CoverEntityFeature.SET_POSITION
     )
 
+    # coverage (these are always False for now)
+    assert entity.is_opening is False
+    assert entity.is_closing is False
+
     # test that the state has changed from unavailable to off
     await send_attributes_report(
         zha_gateway, cluster_on_off, {cluster_on_off.AttributeDefs.on_off.id: 0}
@@ -736,6 +740,10 @@ async def test_keen_vent(
         | CoverEntityFeature.SET_POSITION
     )
 
+    # coverage (these are always False for now)
+    assert entity.is_opening is False
+    assert entity.is_closing is False
+
     # test that the state has changed from unavailable to off
     await send_attributes_report(zha_gateway, cluster_on_off, {8: 0, 0: False, 1: 1})
     assert entity.state["state"] == STATE_CLOSED

zha/application/platforms/cover/__init__.py

@@ -427,7 +427,17 @@ def state(self) -> dict[str, Any]:
         )
         return response
 
-    @property
+    @functools.cached_property
+    def is_opening(self) -> bool:
+        """Return if the cover is opening or not."""
+        return False
+
+    @functools.cached_property
+    def is_closing(self) -> bool:
+        """Return if the cover is closing or not."""
+        return False
+
+    @functools.cached_property
     def supported_features(self) -> CoverEntityFeature:
         """Return supported features."""
         return self._attr_supported_features