diff --git a/tests/test_constructed_data/test_array_of.py b/tests/test_constructed_data/test_array_of.py
index 7031e9e..8e84833 100644
--- a/tests/test_constructed_data/test_array_of.py
+++ b/tests/test_constructed_data/test_array_of.py
@@ -116,7 +116,7 @@ class TestIntegerArray(unittest.TestCase):
 
         # make it longer
         ary[0] = 4
-        assert ary.value[1:] == [1, 2, None, None]
+        assert ary.value[1:] == [1, 2, 0, 0]
 
     def test_get_item(self):
         if _debug: TestIntegerArray._debug("test_get_item")
diff --git a/tests/test_service/test_object.py b/tests/test_service/test_object.py
index 22a4bc7..762a9ba 100644
--- a/tests/test_service/test_object.py
+++ b/tests/test_service/test_object.py
@@ -159,7 +159,7 @@ class TestWritableArray(unittest.TestCase):
         assert obj.ReadProperty('location', 0) == 2
 
         # array extended with none, should get property default value
-        assert obj.ReadProperty('location', 2) == None
+        assert obj.ReadProperty('location', 2) == ""
 
         # wrong datatype
         with self.assertRaises(InvalidParameterDatatype):
@@ -184,11 +184,11 @@ class TestWritableArray(unittest.TestCase):
         if _debug: TestWritableArray._debug("test_replacing_array")
 
         # create an object with a location
-        obj = SampleWritableArray(location=ArrayOfCharacterString())
+        obj = SampleWritableArray()
         if _debug: TestWritableArray._debug("    - obj.location: %r", obj.location)
 
         # replace the array
-        obj.WriteProperty('location', ["home", "work"])
+        obj.WriteProperty('location', ArrayOfCharacterString(["home", "work"]))
         assert obj.ReadProperty('location', 0) == 2
         assert obj.ReadProperty('location', 1) == "home"
         assert obj.ReadProperty('location', 2) == "work"