Revert "remove mock to debug kokoro failures"
Revert "remove mock to debug kokoro failures"

This reverts commit 63f5827dbfb791fe39be36d3d0357e37ceb45765.

derekjchow/models,tombstone/models,tombstone/models,alexgorban/models,derekjchow/models,derekjchow/models,derekjchow/models,alexgorban/models,alexgorban/models,derekjchow/models,alexgorban/models,alexgorban/models,tombstone/models,tombstone/models,tombstone/models,tombstone/models