[unittest] Run setUp only once

[Nikolaus Rath]

Hello,

I have a number of conceptually separate tests that nevertheless need
a common, complicated and expensive setup.

Unfortunately, unittest runs the setUp method once for each defined
test, even if they're part of the same class as in

class TwoTests(unittest.TestCase):
    def setUp(self):
        # do something very time consuming

    def testOneThing(self):


    def testADifferentThing(self):

    
which would call setUp twice.


Is there any way to avoid this, without packing all the unrelated
tests into one big function?


Best,

   -Nikolaus

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