Add tests

Author: DylanRussell

util/opentelemetry-util-genai/tests/test_upload.py

@@ -102,6 +102,8 @@ def setUp(self):
         self.hook = UploadCompletionHook(
             base_path=BASE_PATH, max_queue_size=MAXSIZE, lru_cache_max_size=5
         )
+        # 1 upload is done when creating the UploadHook to ensure upload works. Reset mock.
+        self.mock_fs.reset_mock()
 
     def tearDown(self) -> None:
         self.hook.shutdown()
@@ -145,6 +147,18 @@ def test_upload_then_shutdown(self):
             "should have uploaded 4 files",
         )
 
+    def test_failed_upload_causes_initializer_to_throw(self):
+        self.mock_fs.open.side_effect = ValueError("Failed for some reason!")
+        with self.assertRaisesRegex(
+            ValueError,
+            "Failed to write file to the following path to test if upload working",
+        ):
+            UploadCompletionHook(
+                base_path=BASE_PATH,
+                max_queue_size=MAXSIZE,
+                lru_cache_max_size=5,
+            )
+
     def test_lru_cache_works(self):
         record = LogRecord()
         self.hook.on_completion(