Try Abbreviatory in Your Browser
Pick a sample or paste your own test run, log, JSON, diff, HTTP response or directory listing, and reduce it. The engine runs right here, compiled to WebAssembly, the same code as the command line tool. Nothing you paste leaves this page. Click any [ref …] in the report to see the original lines it stands for.
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Compare Two Runs
With a history, each report starts with what changed since the last run. Here are two runs of the same go test suite: between them one test started failing and another got fixed. Reduce them in order, then reduce the second one again.