您必须设置模拟程序以驱动测试用例的执行.

You have to setup your mock to drive the execution of your test case.

例如，如果要通过此行: if(！_genreRepo.SubGenreExist(subGenreId))

For example if you want to go through this line: if (!_genreRepo.SubGenreExist(subGenreId))

然后，您必须设置以下模拟行为:

then you have to setup the following mock behaviour:

subGenreRepositoryMock.Setup(repo => repo.SubGenreExist(It.IsAny<Guid>)).Returns(true);

要到达此行: return NoContent(); ，您可能还需要设置其他两种方法来驱动测试用例.

To reach this line: return NoContent(); you might need to setup the other two methods as well to drive your test case.