tapjs
Test Anything Protocol tools for node
...The API is simple but powerful. t.test() and a few assertions are all you really need. Everything is statically typed, so your editor can tell you what's available. Remember less, just write some tests. An easily extensible TAP test framework, with outstanding TypeScript support, a CLI, plenty of assertion methods, snapshots, object/method spies, module mocking, file system fixtures, lifecycle hooks, test filtering, comprehensive code coverage analysis, color-accessible test reporters, and more. Software testing is a software and user experience design challenge that balances on the intersection of many conflicting demands.