Minor fixes to tests. Some datastore had strange parameters in calls.

Fix error values for CustomMarking and fix incorrect test data

stix2/test/v20/test_custom.py

@@ -670,7 +670,7 @@ def test_custom_extension():
     with pytest.raises(stix2.exceptions.MissingPropertiesError) as excinfo:
         NewExtension(property2=42)
     assert excinfo.value.properties == ['property1']
-    assert str(excinfo.value) == "No values for required properties for _Custom: (property1)."
+    assert str(excinfo.value) == "No values for required properties for _CustomExtension: (property1)."
 
     with pytest.raises(ValueError) as excinfo:
         NewExtension(property1='something', property2=4)

stix2/test/v20/test_datastore_filesystem.py

@@ -421,7 +421,7 @@ def test_filesystem_object_with_custom_property(fs_store):
         x_empire="Roman",
         allow_custom=True)
 
-    fs_store.add(camp, True)
+    fs_store.add(camp)
 
     camp_r = fs_store.get(camp.id)
     assert camp_r.id == camp.id

stix2/test/v20/test_datastore_filters.py

@@ -14,8 +14,7 @@ stix_objs = [
         ],
         "modified": "2017-01-27T13:49:53.997Z",
         "name": "Poison Ivy",
-        "type": "malware",
-        "is_family": False
+        "type": "malware"
     },
     {
         "created": "2014-05-08T09:00:00.000Z",

stix2/test/v21/test_custom.py

@@ -674,7 +674,7 @@ def test_custom_extension():
     with pytest.raises(stix2.exceptions.MissingPropertiesError) as excinfo:
         NewExtension(property2=42)
     assert excinfo.value.properties == ['property1']
-    assert str(excinfo.value) == "No values for required properties for _Custom: (property1)."
+    assert str(excinfo.value) == "No values for required properties for _CustomExtension: (property1)."
 
     with pytest.raises(ValueError) as excinfo:
         NewExtension(property1='something', property2=4)

stix2/test/v21/test_datastore_filesystem.py

@@ -417,7 +417,7 @@ def test_filesystem_object_with_custom_property(fs_store):
                               x_empire="Roman",
                               allow_custom=True)
 
-    fs_store.add(camp, True)
+    fs_store.add(camp)
 
     camp_r = fs_store.get(camp.id)
     assert camp_r.id == camp.id