experior

Experior doesn't care what language your test program is written in. All it cares about is that each test's output begins and ends with a simple line of JSON. Your test program can validate its own output, in which case Experior just acts as a report engine. Alternatively -- or additionally -- you can write validation functions in JavaScript, and Experior will run them against the test output. Finally, Experior can compare your current test output against a copy of previous test output and alert you to regressions.