diff --git a/tests/utils/datatypes/datatype_tests.py b/tests/utils/datatypes/datatype_tests.py
index cac6b44650f..a26a68572fc 100644
--- a/tests/utils/datatypes/datatype_tests.py
+++ b/tests/utils/datatypes/datatype_tests.py
@@ -133,34 +133,6 @@ def test_tile_clean(self):
         self.assertIsNotNone(tile2.data[nodeid])
 
 
-class NonLocalizedStringDataTypeTests(ArchesTestCase):
-    def test_string_validate(self):
-        string = DataTypeFactory().get_instance("non-localized-string")
-        some_errors = string.validate(float(1.2))
-        self.assertGreater(len(some_errors), 0)
-        no_errors = string.validate("Hello World")
-        self.assertEqual(len(no_errors), 0)
-
-    def test_string_clean(self):
-        string = DataTypeFactory().get_instance("non-localized-string")
-        nodeid1 = "72048cb3-adbc-11e6-9ccf-14109fd34195"
-        nodeid2 = "72048cb3-adbc-11e6-9ccf-14109fd34196"
-        resourceinstanceid = "40000000-0000-0000-0000-000000000000"
-
-        json_empty_strings = {
-            "resourceinstance_id": resourceinstanceid,
-            "parenttile_id": "",
-            "nodegroup_id": nodeid1,
-            "tileid": "",
-            "data": {nodeid1: "''", nodeid2: ""},
-        }
-        tile1 = Tile(json_empty_strings)
-        string.clean(tile1, nodeid1)
-        self.assertIsNone(tile1.data[nodeid1])
-        string.clean(tile1, nodeid2)
-        self.assertIsNone(tile1.data[nodeid2])
-
-
 class URLDataTypeTests(ArchesTestCase):
     def test_validate(self):
         url = DataTypeFactory().get_instance("url")
diff --git a/tests/utils/non_localized_string_tests.py b/tests/utils/datatypes/non_localized_string_tests.py
similarity index 79%
rename from tests/utils/non_localized_string_tests.py
rename to tests/utils/datatypes/non_localized_string_tests.py
index f8af900917a..304e3693fbf 100644
--- a/tests/utils/non_localized_string_tests.py
+++ b/tests/utils/datatypes/non_localized_string_tests.py
@@ -51,6 +51,25 @@ def test_to_rdf(self):
         result = nonlocalized_string_dt.to_rdf(edge_info, edge)
         self.assertIsInstance(result, ConjunctiveGraph)
 
+    def test_string_clean_json(self):
+        string = DataTypeFactory().get_instance("non-localized-string")
+        nodeid1 = "72048cb3-adbc-11e6-9ccf-14109fd34195"
+        nodeid2 = "72048cb3-adbc-11e6-9ccf-14109fd34196"
+        resourceinstanceid = "40000000-0000-0000-0000-000000000000"
+
+        json_empty_strings = {
+            "resourceinstance_id": resourceinstanceid,
+            "parenttile_id": "",
+            "nodegroup_id": nodeid1,
+            "tileid": "",
+            "data": {nodeid1: "''", nodeid2: ""},
+        }
+        tile1 = Tile(json_empty_strings)
+        string.clean(tile1, nodeid1)
+        self.assertIsNone(tile1.data[nodeid1])
+        string.clean(tile1, nodeid2)
+        self.assertIsNone(tile1.data[nodeid2])
+
 
 def mock_edge(
     s_id,