pytest: how to skip the testcases and jump right up to cleanup if something goes wrong in setup?

Question

I understand that in pytest, the preferred way for setup and cleanup is to utilize yield, like

class TestSomething():
    @pytest.fixture(scope="class", autouse=True)
    def setup_cleanup(self, request):
        ...
        yield
        ...

    def test_something(self):
        ...

Problem is, if there is a failure in the setup part, before yield happens, the cleanup code would not get a chance to run.

Is it possible that, when some critical failure occurs in setup, all testcases are skipped, and the control is taken over by the cleanup (after yield in the method setup_cleanup)?

Answer 1

setup_cleanup triggers the test function, but it is still a function. An exception raised in any step will prevent the rest of it to be excited.

A work around will be to use try finally. It will allow the test and teardown to run without swallowing the exception

@pytest.fixture(scope="class", autouse=True)
def setup_cleanup(self, request):
    try:
        print('Setup')
        raise Exception("Setup Exception")
        yield
    finally:
        print('Teardown')

def test_example_test(self):
    print('Test')

With the exception

Setup
Teardown

test setup failed
self = <ExampleTest.TestSomething object at 0x045E6230>
request = <SubRequest 'setup_cleanup' for <Function test_something>>

    @pytest.fixture(scope="class", autouse=True)
    def setup_cleanup(self, request):
        print()
        try:
            print('Setup')
>           raise Exception("Setup Exception")
E           Exception: Setup Exception

And without

Setup
.Test
Teardown