Wallaby.js is insanely fast, because it only executes tests affected by your code changes and runs your tests in parallel.
WallabyJS has plugins for the IntelliJ platform, Visual Studio, Atom, and more recently, there's preview support for Visual Studio Code and Sublime Text support is coming soon.
It supports supports TypeScript, CoffeeScript, and ES7. Wallaby supports jasmine for running tests but you can plug in your own testing framework and assertion library as you like.
Installing WallabyJS for Visual Studio Code is very easy now that Code supports extensions.
Once you've installed the extension it will download what's needed and bootstrap WallabyJS. I did have a small issue installing, but and uninstall/reinstall fixed it, so it may have been just a blip.
If you want to see it in action quickly without much setup, just clone their Calculator sample at
git clone https://github.com/wallabyjs/calculator-sample.git
Do note that it's not totally obvious once you've installed WallabyJS that you have to "start" its server manually...for now.
Once it has started, it's mostly automatic and runs tests as you type and save. You can access all WallabyJS's commands with hotkeys or from the Visual Studio Code command palette.
It's great to see a powerful tool like this working in Visual Studio Code. Remember you can get VSCode (now open source!) for any platform here code.visualstudio.com and you can get WallabyJS at their main site.
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