diff --git a/test/property/test_property.py b/test/property/test_property.py
index 1529f8c..26634c9 100644
--- a/test/property/test_property.py
+++ b/test/property/test_property.py
@@ -1,8 +1,28 @@
 import unittest
+from unittest.mock import Mock
 from owrx.property import Property
 
 
 class PropertyTest(unittest.TestCase):
-    def testSimple(self):
+    def testValue(self):
         prop = Property("testvalue")
         self.assertEqual(prop.getValue(), "testvalue")
+
+    def testChangeValue(self):
+        prop = Property("before")
+        prop.setValue("after")
+        self.assertEqual(prop.getValue(), "after")
+
+    def testInitialValueOnCallback(self):
+        prop = Property("before")
+        m = Mock()
+        prop.wire(m.method)
+        m.method.assert_called_once_with("before")
+
+    def testChangedValueOnCallback(self):
+        prop = Property("before")
+        m = Mock()
+        prop.wire(m.method)
+        m.reset_mock()
+        prop.setValue("after")
+        m.method.assert_called_with("after")