Troubleshooting Copilot generating flaky tests
Copilot sometimes suggests non-deterministic tests relying on time or external services; need strategies to detect and fix flaky tests before merging.
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Detect flaky tests by adding a CI rerun job that repeats failing suites (e.g., x5–x10) and by running local repeated runs. Fixes: inject clocks (jest.useFakeTimers / sinon.fakeTimers) instead of Date.now; mock network calls (nock / msw) or inject HTTP clients; control randomness with fixed seeds; quarantine flaky tests until fixed. When GitHub Copilot suggests time or external calls, ask it to rewrite tests with injected mocks.
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