Reproducing a Flaky Test in Go

A well-written Go developer, Mark Rushakoff, shares his experiences on reproducing flaky tests in Go. Flaky tests are nondeterministic tests that fail occasionally due to various reasons such as data order, timing issues, or concurrency problems. To reproduce a flaky test, one must focus on the exact package and test that failed, use -run flags to isolate the failing test, increase the count of iterations with -count=1 to ensure multiple runs, and run the test in a loop until it reproduces within a minute or less. If still unable to reproduce, tools like data race detector, cpulimit for CPU throttling, and adjusting GOMAXPROCS can help identify the root cause of flakiness.

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