"My major goal was to create a tool that would allow [me as a developer] to get an instant feedback from my tests and right in my editor, just as I type my code, even if I have thousands of tests," said Govorov, who has worked as an independent contractor at JetBrains. "Existing test runners can either run some manually selected tests or all of the tests, and it may be time-consuming. Wallaby.js in its turn is using a sophisticated technology to automatically calculate and run the minimal required number of tests affected by your code changes." Wallaby.js, however, can work alongside testing technologies, such as Mocha, Jasmine, and QUnit
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