diff --git a/tools/rehosting/rehost_test.py b/tools/rehosting/rehost_test.py
new file mode 100644
index 0000000..da316e2
--- /dev/null
+++ b/tools/rehosting/rehost_test.py
@@ -0,0 +1,37 @@
+import unittest
+import unittest.mock
+from tools.rehosting import rehost
+from pathlib import Path
+import os
+
+
+class TestRehost(unittest.TestCase):
+
+    def test_url_validation(self):
+        self.assertEqual("http://google.com",
+                         rehost.validate_url("http://google.com"))
+        self.assertRaisesRegex(Exception, "Invalid URL", rehost.validate_url,
+                               "file:///some/secret")
+        self.assertRaisesRegex(Exception, "Invalid URL", rehost.validate_url,
+                               "http://10.0.0.0/secret")
+
+    def test_url_to_path(self):
+        test_dir = os.getenv("TEST_TMPDIR", "/tmp/")
+        with unittest.mock.patch.object(rehost, "BUILD_DEPENDENCIES_PATH",
+                                        test_dir):
+            existing_file = test_dir + "/exists.com"
+            with open(existing_file, 'w') as f:
+                f.write('string')
+            self.assertEqual(
+                Path(test_dir) / "example.com/foo/bar",
+                rehost.url_to_path("https://example.com/foo/bar"))
+            self.assertRaisesRegex(ValueError,
+                                   f"not in the subpath of '{test_dir}'",
+                                   rehost.url_to_path,
+                                   "https://example.com/../../bar")
+            self.assertRaisesRegex(FileExistsError, "There is already a file",
+                                   rehost.url_to_path, "https://exists.com")
+
+
+if __name__ == "__main__":
+    unittest.main()