分别运行时，三个单元测试通过，而一起运行时，只有一个通过

Question

I have three tests, FunnyCarSteps.cs , CarLotMaxSteps.cs , and CarTypeSteps.cs . When run seperatley they all pass, but when run together only CarLotMaxSteps passes.

CarTypeSteps.cs fails at line 49 with a lambda method no source available error. FunnyCarSteps.cs fails at line 19 with an index out of range error.

I am new to unit testing and don't understand what is going on.

Any help is greatly appreciated.

Answer 1

Since the Program.Main is static , your CarList is probably also static. NUnit runs tests in parallel, so each of the tests is running at nearly the same time and each is clearing the list and adding to it at the same time.

That is why your tests run fine on their own, but fail when run together. One starts up and starts testing, then the second comes along and changes the data that the first test is working with.

You need to remove static from everything in Program except for main. Ideally, you should refactor all of your car list code out to a new non-static class. Program is for running your program, it shouldn't have anything to do with cars. You should be creating your CarLot (or whatever) class in Main and executing it, not adding properties to Program.

Another option is to add the attribute [Parallelizable(ParallelScope.None)] to each of your test classes. This will cause them to run one at a time. This will fix the problem with your tests, but it does not fix the fact that your code is incorrect for anything more than a simple exercise.