Fix flaky test fails caused by `mock.MagicMock().call_count` is not thread-safe.

google / mobly

E2E test framework for tests with complex environment requirements.

https://github.com/google/mobly

Apache License 2.0

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Fix flaky test fails caused by `mock.MagicMock().call_count` is not thread-safe. #682

Closed eric100lin closed 3 years ago

eric100lin commented 3 years ago

This PR intend to fix "kokoro-windows — Internal CI build failed" of #681 due to flaky test fails caused by mock.MagicMock().call_count is not thread-safe.

This change is