diff --git a/tests/policy_test.py b/tests/policy_test.py
new file mode 100644
index 0000000..3cf4a1b
--- /dev/null
+++ b/tests/policy_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.
+"""Tests for policy"""
+
+import unittest
+from policy import MatchPathPrefix
+
+# pylint: disable=missing-docstring
+class PolicyTests(unittest.TestCase):
+    def assertMatches(self, path, prefix):
+        self.assertTrue(MatchPathPrefix(path, prefix))
+
+    def assertDoesNotMatch(self, path, prefix):
+        self.assertFalse(MatchPathPrefix(path, prefix))
+
+    # tests
+
+    def test_match_path_prefix(self):
+        # check common prefix heuristics
+        self.assertMatches("/(vendor|system/vendor)/bin/sh", "/vendor/bin")
+        self.assertMatches("/(vendor|system/vendor)/bin/sh", "/system/vendor/bin"),
+        self.assertMatches("/(odm|vendor/odm)/etc/selinux", "/odm/etc"),
+        self.assertMatches("/(odm|vendor/odm)/etc/selinux", "/vendor/odm/etc"),
+        self.assertMatches("/(system_ext|system/system_ext)/bin/foo", "/system_ext/bin"),
+        self.assertMatches("/(system_ext|system/system_ext)/bin/foo", "/system/system_ext/bin"),
+        self.assertMatches("/(product|system/product)/lib/libc.so", "/product/lib"),
+        self.assertMatches("/(product|system/product)/lib/libc.so", "/system/product/lib"),
+        self.assertDoesNotMatch("/(vendor|system/vendor)/bin/sh", "/system/bin"),
+        self.assertDoesNotMatch("/(odm|vendor/odm)/etc/selinux", "/vendor/etc"),
+        self.assertDoesNotMatch("/(system_ext|system/system_ext)/bin/foo", "/system/bin"),
+        self.assertDoesNotMatch("/(product|system/product)/lib/libc.so", "/system/lib"),
+
+        # check generic regex
+        self.assertMatches("(/.*)+", "/system/etc/vintf")
+        self.assertDoesNotMatch("(/.*)+", "foo/bar/baz")
+
+        self.assertMatches("/(system|product)/lib(64)?(/.*)+.*\.so", "/system/lib/hw/libbaz.so")
+        self.assertMatches("/(system|product)/lib(64)?(/.*)+.*\.so", "/system/lib64/")
+        self.assertMatches("/(system|product)/lib(64)?(/.*)+.*\.so", "/product/lib/hw/libbaz.so")
+        self.assertMatches("/(system|product)/lib(64)?(/.*)+.*\.so", "/product/lib64/")
+        self.assertDoesNotMatch("/(system|product)/lib(64)?(/.*)+.*\.so", "/vendor/lib/hw/libbaz.so")
+        self.assertDoesNotMatch("/(system|product)/lib(64)?(/.*)+.*\.so", "/odm/lib64/")
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)