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I'm writing selenium tests, with a set of classes, each class containing several tests. Each class currently opens and then closes Firefox, which has two consequences:

  • super slow, opening firefox takes longer than running the test in a class...
  • crashes, because after firefox has been closed, trying to reopen it really quickly, from selenium, results in an 'Error 54'

I could solve the error 54, probably, by adding a sleep method, but it would still be super slow.

So, what I'd like to do is reuse the same Firefox instances across all test classes. Which means I need to run a method before all test classes, and another method after all test classes. So, 'setup_class' and 'teardown_class' are not sufficient.

1 Answer

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You might want to use a session-scoped "autouse" fixture:

# content of conftest.py or a tests file (e.g. in your tests or root directory)

@pytest.fixture(scope="session", autouse=True)

def do_something(request):

    # prepare something ahead of all tests

    request.addfinalizer(finalizer_function)

This will run ahead of all tests. After the last test is finished,  the finalizer will be called.

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