How to Perform Regression Testing From the Command Line

Command-line regression testing can reduce slow and unreliable feedback loops by tagging tests, selecting relevant subsets, running only tests affected by changes, sharding suites across CI jobs, rerunning failures, and explicitly detecting flaky results. The guide demonstrates equivalent commands for Playwright, pytest, Jest, and Maven, recommending changed-test runs for pull requests and full regression runs nightly because file-based selection can miss shared dependencies or backend effects. It emphasizes previewing filters to avoid zero-test passes, balancing shards by splitting oversized test files, and treating tests that pass only on retry as visible quality signals, with Playwright’s fail-on-flaky option available to block pull requests. A sample GitHub Actions workflow combines change detection, four shards, retries, and required exit codes to gate merges. For plain-English tests, TestMu AI’s Kane CLI uses tagged Markdown test files, replayable recorded steps, selective re-authoring when application behavior or expectations change, and optional remote execution on the HyperExecute grid, producing screenshots, logs, and other evidence while using exit codes to report passed runs, failed steps, or setup errors.

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