This story was originally published on HackerNoon at: https://hackernoon.com/code-smell-259-control-your-environment-to-avoid-test-failures. Learn how to prevent unreliable tests by generating or mocking test data, ensuring full control over the testing environment and avoiding external dependencies. Check more stories related to programming at: https://hackernoon.com/c/programming. You can also check exclusive content about #programming, #clean-code, #technology, #software-testing, #testing, #javascript, #refactoring, #test-environment, and more. This story was written by: @mcsee. Learn more about this writer by checking @mcsee's about page, and for more stories, please visit hackernoon.com. Tests must be in full control.