I built a tool to get instant test results
I got sick of the old software development loop: Change code -> Run tests -> wait -> wait some more -> look at failures. I decided to build a tool that will enable you to: Change code -> look at failures. No wait time, no explicit test running. Under the hood: - Runs the whole test suite and collects code coverage per test. - For each auto file save, analyzes the changes on the tests. - Runs changed tests in the background. - Display results, the loop time from change to test results is approx 250ms. Instead of: code -> alt+tab -> arrow up -> rerun all the tests -> wait ... -> test results…
I built a tool to get instant test results launched on November 16, 2022 with 96 votes, #458 of 3,471 launches that month and more than 90% of that year's launches. The site was not reachable when checked in September 2026.
In plain words
This tool automates test execution for software developers by running only the affected tests whenever code is saved, eliminating wait times in the development cycle. It analyzes code changes against test coverage data and displays results in approximately 250 milliseconds, allowing developers to see test failures immediately after making changes. The tool is designed for developers who want to streamline their workflow and reduce context switching during coding sessions.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I got sick of the old software development loop: Change code -> Run tests -> wait -> wait some more -> look at failures. I decided to build a tool that will enable you to: Change code -> look at failures. No wait time, no explicit test running. Under the hood: - Runs the whole test suite and collects code coverage…
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Source: Show HN post ↗ · launch text quoted in part
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