If it's a tool: for me it is probably Wallaby.js - realtime as you type test runner with super powerful in editor feedback and debugging tools (and as someone else said, Quokka.js its sibling).
For a language then that's harder - I always had a soft spot for Ruby, I'm very excited about Elixir, I think C# is powerful and expressive, but coming from where it was - modern Javascript has a fluidity that is complimented by it's new found terseness and support for asynchronous coding.
Wallaby is the best. Not only is it a joy to use, if you by accident throw a project at it that doesn't work their support team is always very quick to help you out (Example: github.com/wallabyjs/public/issues...).
For other languages there are also alternatives. C# -> nCrunch, Python -> PyCrunch, Java -> InfiniTest.
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If it's a tool: for me it is probably Wallaby.js - realtime as you type test runner with super powerful in editor feedback and debugging tools (and as someone else said, Quokka.js its sibling).
For a language then that's harder - I always had a soft spot for Ruby, I'm very excited about Elixir, I think C# is powerful and expressive, but coming from where it was - modern Javascript has a fluidity that is complimented by it's new found terseness and support for asynchronous coding.
Wallaby is the best. Not only is it a joy to use, if you by accident throw a project at it that doesn't work their support team is always very quick to help you out (Example: github.com/wallabyjs/public/issues...).
For other languages there are also alternatives. C# -> nCrunch, Python -> PyCrunch, Java -> InfiniTest.