diff --git a/scripts/jsonmodify_test.py b/scripts/jsonmodify_test.py
new file mode 100644
index 0000000..6f0291d
--- /dev/null
+++ b/scripts/jsonmodify_test.py
@@ -0,0 +1,75 @@
+#!/usr/bin/env python
+#
+# Copyright (C) 2022 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+"""Tests for jsonmodify."""
+
+import json
+import jsonmodify
+import unittest
+
+
+class JsonmodifyTest(unittest.TestCase):
+
+  def test_set_value(self):
+    obj = json.loads('{"field1": 111}')
+    field1 = jsonmodify.SetValue("field1")
+    field1.apply(obj, 222)
+    field2 = jsonmodify.SetValue("field2")
+    field2.apply(obj, 333)
+    expected = json.loads('{"field1": 222, "field2": 333}')
+    self.assertEqual(obj, expected)
+
+  def test_replace(self):
+    obj = json.loads('{"field1": 111}')
+    field1 = jsonmodify.Replace("field1")
+    field1.apply(obj, 222)
+    field2 = jsonmodify.Replace("field2")
+    field2.apply(obj, 333)
+    expected = json.loads('{"field1": 222}')
+    self.assertEqual(obj, expected)
+
+  def test_replace_if_equal(self):
+    obj = json.loads('{"field1": 111, "field2": 222}')
+    field1 = jsonmodify.ReplaceIfEqual("field1")
+    field1.apply(obj, 111, 333)
+    field2 = jsonmodify.ReplaceIfEqual("field2")
+    field2.apply(obj, 444, 555)
+    field3 = jsonmodify.ReplaceIfEqual("field3")
+    field3.apply(obj, 666, 777)
+    expected = json.loads('{"field1": 333, "field2": 222}')
+    self.assertEqual(obj, expected)
+
+  def test_remove(self):
+    obj = json.loads('{"field1": 111, "field2": 222}')
+    field2 = jsonmodify.Remove("field2")
+    field2.apply(obj)
+    field3 = jsonmodify.Remove("field3")
+    field3.apply(obj)
+    expected = json.loads('{"field1": 111}')
+    self.assertEqual(obj, expected)
+
+  def test_append_list(self):
+    obj = json.loads('{"field1": [111]}')
+    field1 = jsonmodify.AppendList("field1")
+    field1.apply(obj, 222, 333)
+    field2 = jsonmodify.AppendList("field2")
+    field2.apply(obj, 444, 555, 666)
+    expected = json.loads('{"field1": [111, 222, 333], "field2": [444, 555, 666]}')
+    self.assertEqual(obj, expected)
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)