Mutation-testing our JavaScript SDKs

Mutation testing (MT) is a technique used to evaluate the effectiveness of test suites in catching bugs by introducing small code modifications, known as mutants, and assessing whether the tests can detect these changes. Unlike traditional code coverage metrics that only indicate which parts of the code are executed, MT provides insights into whether tests can identify actual faults. Despite its potential, MT remains niche due to its computational intensity; however, tools like Stryker have introduced optimizations such as per-test mutation coverage and incremental mutation testing to improve efficiency. The process has been explored in Sentry's JavaScript SDK, yielding mixed results with a mutation score of 0.62, indicating that 62% of mutants were detected. Although MT highlighted areas for improvement, it faced limitations due to the lack of support for certain testing frameworks like Playwright, which hindered a complete assessment of the test suite's effectiveness. The experience pointed to the challenges and potential of MT in enhancing test quality while acknowledging performance and integration obstacles.

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