implement property deletion handling; activate scheduler deletion

test/property/test_property_layer.py

@@ -1,4 +1,4 @@
-from owrx.property import PropertyLayer
+from owrx.property import PropertyLayer, PropertyDeleted
 from unittest import TestCase
 from unittest.mock import Mock
 
@@ -67,3 +67,27 @@ class PropertyLayerTest(TestCase):
         pm.wire(mock.method)
         pm["testkey"] = "testvalue"
         mock.method.assert_not_called()
+
+    def testDeletionIsSent(self):
+        pm = PropertyLayer(testkey="somevalue")
+        mock = Mock()
+        pm.wireProperty("testkey", mock.method)
+        mock.method.reset_mock()
+        del pm["testkey"]
+        mock.method.assert_called_once_with(PropertyDeleted)
+
+    def testDeletionInGeneralWiring(self):
+        pm = PropertyLayer(testkey="somevalue")
+        mock = Mock()
+        pm.wire(mock.method)
+        del pm["testkey"]
+        mock.method.assert_called_once_with({"testkey": PropertyDeleted})
+
+    def testNoDeletionEventWhenPropertyDoesntExist(self):
+        pm = PropertyLayer(otherkey="somevalue")
+        mock = Mock()
+        pm.wireProperty("testkey", mock.method)
+        mock.method.reset_mock()
+        with self.assertRaises(KeyError):
+            del pm["testkey"]
+        mock.method.assert_not_called()