Update tests for struct package

tests/test_hierarchy.py

@@ -20,7 +20,36 @@ class TestHierarchyPaths(unittest.TestCase):
     def test_returns_correct_path(self, p):
         self.assertEqual(Path(p), Hierarchy(p).path)
 
-    @given(one_of(iterables(elements=none()), booleans()))
-    def test_raises_value_error(self, p):
-        with self.assertRaises(TypeError):
-            Hierarchy(p)
+    def test_raises_notimplemented_error(self):
+        h = Hierarchy("backup")
+        with self.assertRaises(NotImplementedError):
+            h.gen_metadata()
+
+
+class TestHierarchyMetadata(unittest.TestCase):
+    def setUp(self):
+        self.patched_json = patch(f"{TESTING_MODULE}.json")
+        self.patched_path = patch.object(
+            Hierarchy, "metadata_path", new_callable=PropertyMock, spec_set=Path
+        )
+
+        self.mocked_path = self.patched_path.start()
+        self.mocked_json = self.patched_json.start()
+
+    @unittest.skip("Figure out how to mock file objects")
+    @given(text())
+    def test_write_metadata(self, data):
+        file_obj = StringIO()
+        self.mocked_path.return_value.open.return_value = file_obj
+
+        self.mocked_json.load.return_value = file_obj.getvalue()
+
+        h = Hierarchy("backup")
+        h.write_metadata(data)
+        read_data = h.read_metadata()
+
+        self.assertEqual(data, read_data)
+
+    def tearDown(self):
+        self.patched_json.stop()
+        self.patched_path.stop()