add unit test for gcs_storage refreshable creds

icechunk-python/tests/test_credentials.py

@@ -4,6 +4,7 @@
 import pytest
 
 from icechunk import (
+    gcs_storage,
     Repository,
     S3Options,
     S3StaticCredentials,
@@ -113,7 +114,7 @@ def __call__(self) -> S3StaticCredentials:
         )
 
 
-def test_refreshable_credentials_refresh(tmp_path: Path) -> None:
+def test_s3_refreshable_credentials_refresh(tmp_path: Path) -> None:
     path = tmp_path / "calls.txt"
     creds_obj = ExpirableCredentials(path)
 
@@ -136,3 +137,25 @@ def test_refreshable_credentials_refresh(tmp_path: Path) -> None:
     assert not Repository.exists(st)
     assert not Repository.exists(st)
     assert path.read_text() == "..."
+
+
+def test_gcs_refreshable_credentials_refresh(tmp_path: Path) -> None:
+    path = tmp_path / "calls.txt"
+    creds_obj = ExpirableCredentials(path)
+
+    st = gcs_storage(
+        bucket="testbucket",
+        prefix="this-repo-does-not-exist",
+        get_credentials=creds_obj,
+    )
+
+    # credentials expire immediately so refresh function keeps getting called
+    assert not Repository.exists(st)
+    assert not Repository.exists(st)
+    assert not Repository.exists(st)
+    assert path.read_text() == "..."
+
+    # after three times credentials don't expire, so the file doesn't change
+    assert not Repository.exists(st)
+    assert not Repository.exists(st)
+    assert path.read_text() == "..."