How to parameterize python unittest setUp method?

Question

I'm trying to run same test cases with different setUp methods. I've tried using nosetests and parameterized but it seems like it doesn't support parameterizing setUp methods. Here is an example of what I'm trying to do:

...
from nose_parameterized import parameterized

class Example(unittest.TestCase):

    @parameterized.expand(['device1', 'device2'])
    def setUp(self, device):
        desired_caps = {}
        desired_caps['key1'] = device
        desired_caps['key2'] = 'constant value'

    self.driver = webdriver.Remote(url, desired_caps)

    def tearDown(self):
        self.driver.quit()

    def test_app_launch(self):
        # assert something

The error is: TypeError: setUp() takes exactly 2 arguments (1 given).

Is there some other way how to parameterize setUp method? I also looked into nosetests generators but it doesn't seem to be the way to go either.

Answer 1

So my approach would be setting up a base test that contains all the tests that the devices have to pass. Then you have to deviceTests that inherit from that baseTest with their own additional setUps which would be device specific.

# this is the base test. Everything that is not specific to the device is set up here. It also contains all the testCases.
import unittest
class deviceTest( unittest.TestCase ):

  def setUp( self ):
    '''
    General setUp here
    '''
    self.desired_caps = {}
    self.desired_caps['key2'] = 'constant value'

  def testWorkflow( self ):
    '''
    Here come the tests that the devices have to pass
    '''

class device1Test( deviceTest ):

  def setUp( self ):
    '''
    device1 specific setup
    '''
    #also run general setUp    
    deviceTest.setUp( self )
    self.desired_caps['key1'] = device
    self.driver = webdriver.Remote(url, desired_caps)


class device2Test( deviceTest ):

  def setUp( self ):
    '''
    device2 specific setup
    '''
    #also run general setUp
    deviceTest.setUp( self )
    self.desired_caps['key1'] = device
    self.driver = webdriver.Remote(url, desired_caps)


if __name__ == '__main__':
  suite = unittest.defaultTestLoader.loadTestsFromTestCase( device1Test )
  suite.addTest( unittest.defaultTestLoader.loadTestsFromTestCase(device2Test ) )
  unittest.TextTestRunner( verbosity = 2 ).run( suite )