diff --git a/tests/sepolicy_freeze_test.py b/tests/sepolicy_freeze_test.py
new file mode 100644
index 0000000..72c8fde
--- /dev/null
+++ b/tests/sepolicy_freeze_test.py
@@ -0,0 +1,56 @@
+# Copyright 2023 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.
+
+from optparse import OptionParser
+import mini_parser
+import os
+import sys
+
+def do_main():
+    usage = "sepolicy_freeze_test "
+    usage += "-c current_cil -p prebuilt_cil [--help]"
+    parser = OptionParser(usage=usage)
+    parser.add_option("-c", "--current", dest="current", metavar="FILE")
+    parser.add_option("-p", "--prebuilt", dest="prebuilt", metavar="FILE")
+
+    (options, args) = parser.parse_args()
+
+    if not options.current or not options.prebuilt:
+        sys.exit("Must specify both current and prebuilt\n" + parser.usage)
+    if not os.path.exists(options.current):
+        sys.exit("Current policy " + options.current + " does not exist\n"
+                + parser.usage)
+    if not os.path.exists(options.prebuilt):
+        sys.exit("Prebuilt policy " + options.prebuilt + " does not exist\n"
+                + parser.usage)
+
+    current_policy = mini_parser.MiniCilParser(options.current)
+    prebuilt_policy = mini_parser.MiniCilParser(options.prebuilt)
+
+    results = ""
+    removed_types = prebuilt_policy.types - current_policy.types
+    removed_attributes = prebuilt_policy.typeattributes - current_policy.typeattributes
+    removed_attributes = set(filter(lambda x: "base_typeattr_" not in x, removed_attributes))
+
+    if removed_types:
+        results += "The following public types were removed:\n" + ", ".join(removed_types) + "\n"
+
+    if removed_attributes:
+        results += "The following public attributes were removed:\n" + ", ".join(removed_attributes) + "\n"
+
+    if len(results) > 0:
+        sys.exit(results)
+
+if __name__ == '__main__':
+    do_main()