cleanups not called when fixture setUp fails with useFixture

[Cedric Brandily]

When we do:

  class MyTest(testtools.TestCase):
    def test(self):
      self.useFixture(fixture2)

fixture2 cleanups are only called if self.addCleanup(fixture2.cleanUp) is called ... but it's done only if fixture2.setUp succeed[1]

[1] https://github.com/testing-cabal/testtools/blob/55278e0e4a935f1d8c468a4d29a8133088806790/testtools/testcase.py#L681

[Cedric Brandily (cbrandily)]

The problem has been solved by the definition of _setUp