forgot to add stuff

backend/tests/test_cache_utils.py

@@ -0,0 +1,57 @@
+import tempfile
+import time
+import unittest
+from pathlib import Path
+
+from backend.utils import cache as cache_utils
+
+
+class CacheUtilsTests(unittest.TestCase):
+    def setUp(self) -> None:
+        self._tmp_dir = tempfile.TemporaryDirectory()
+        self._old_cache_dir = cache_utils.CACHE_DIR
+        cache_utils.CACHE_DIR = Path(self._tmp_dir.name) / "cache"
+
+        self._work_dir = Path(self._tmp_dir.name) / "work"
+        self._work_dir.mkdir(parents=True, exist_ok=True)
+        self._src_file = self._work_dir / "sample.txt"
+        self._src_file.write_text("hello", encoding="utf-8")
+
+    def tearDown(self) -> None:
+        cache_utils.CACHE_DIR = self._old_cache_dir
+        self._tmp_dir.cleanup()
+
+    def test_get_file_hash_returns_none_for_missing_file(self) -> None:
+        missing = self._work_dir / "missing.txt"
+        self.assertIsNone(cache_utils.get_file_hash(missing))
+
+    def test_save_and_load_round_trip(self) -> None:
+        payload = {"value": 123, "ok": True}
+        saved = cache_utils.save_to_cache(self._src_file, payload, model="m1", operation="transcribe")
+        self.assertTrue(saved)
+
+        loaded = cache_utils.load_from_cache(self._src_file, model="m1", operation="transcribe")
+        self.assertEqual(payload, loaded)
+
+    def test_load_from_cache_respects_max_age(self) -> None:
+        payload = {"value": 999}
+        self.assertTrue(cache_utils.save_to_cache(self._src_file, payload, operation="transcribe"))
+
+        time.sleep(0.02)
+        expired = cache_utils.load_from_cache(self._src_file, operation="transcribe", max_age=0.001)
+        self.assertIsNone(expired)
+
+    def test_clear_cache_deletes_files(self) -> None:
+        self.assertTrue(cache_utils.save_to_cache(self._src_file, {"a": 1}, operation="transcribe"))
+        self.assertTrue(cache_utils.save_to_cache(self._src_file, {"a": 2}, operation="summarize"))
+
+        deleted_count = cache_utils.clear_cache()
+        self.assertGreaterEqual(deleted_count, 1)
+
+        size_bytes, file_count = cache_utils.get_cache_size()
+        self.assertEqual(size_bytes, 0)
+        self.assertEqual(file_count, 0)
+
+
+if __name__ == "__main__":
+    unittest.main()