With the function 'Test.Tasty.ExpectedFailure.expectFail' in the provided
module "Test.Tasty.ExpectedFailure", you can mark that you expect test cases to
fail, and not to pass.
This can for example be used for test-driven development: Create the tests,
mark them with 'Test.Tasty.ExpectedFailure.expectFail', and you can still push
to the main branch, without your continuous integration branch failing.
Once someone implements the feature or fixes the bug (maybe unknowingly), the
test suite will tell him so, due to the now unexpectedly passing test, and he
can remove the 'Test.Tasty.ExpectedFailure.expectFail' marker.
The module also provides 'Test.Tasty.ExpectedFailure.ignoreTest' to avoid
running a test. Both funtions are implemented via the more general
'Test.Tasty.ExpectedFailure.wrapTest', which is also provided.