little update

tests/test_iam.py

@@ -0,0 +1,26 @@
+import json
+from unittest.mock import patch
+
+from cloud.iam import IAMClient
+
+
+class Response:
+    def read(self) -> bytes:
+        return json.dumps({"access_token": "fresh-token"}).encode()
+
+    def __enter__(self) -> "Response":
+        return self
+
+    def __exit__(self, *args: object) -> None:
+        return None
+
+
+@patch("cloud.iam.urlopen")
+def test_fetches_iam_token(urlopen) -> None:
+    urlopen.return_value = Response()
+
+    assert IAMClient("key-id", "secret").get_access_token() == "fresh-token"
+
+    request = urlopen.call_args.args[0]
+    assert request.full_url == "https://iam.api.cloud.ru/api/v1/auth/token"
+    assert json.loads(request.data) == {"keyId": "key-id", "secret": "secret"}