How do I define an order to run junit tests in Intellij?

Question

I have a flaky junit test that only fails if I run all my tests. I think that one test is causing another test to fail, I want to prove it before I try to fix it.

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Answer 1

Unit tests ought to be independent so most frameworks don't guarantee or enforce the order in which they are run. But since you want to enforce an order the easiest way I've done it in the past it to create a "throw away" test suite or test method that calls the tests in whatever order I want them to run in. Unit tests are methods, just call them. This is easy to do if you're dealing with tens of tests, not at all appealing if you're dealing with hundreds or thousands.

Try to isolate the flaky interaction as much as possible, then swap around the order of the poorly interacting tests within the throwaway calling method.