When Green Browser Tests Lie: Environment Drift, CI Noise, and Hidden Runtime Failures

Short summary

Green browser tests can still be wrong due to environment drift, feature flag changes, mock drift, and ephemeral preview environment issues. The article provides concrete strategies: recording active flag state per run, adding environment verification phases before test suites, and treating mocks as code requiring compatibility checks. It's a practical guide for engineering teams struggling with flaky or misleading CI results.

• •Green tests can lie when environment, flags, or mocks drift from reality
• •Record active feature flag state and verify environment before running suites
• •Treat mocks as code requiring compatibility checks to avoid false confidence

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