Let’s assume we are doing TDD (and maybe BDD too) and we don’t want to write software without a failing test.

Back in the day, whether you were writing PHP, Java, or Asp.Net, testing your server side application was easy. You wrote unit tests for your models, controllers, data objects, etc. Then, you ran them every few minutes as you wrote new code and features. Everything was simple and all of your tests existed in the same language and execution environment as the business logic (i.e. the server).

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