python unittest setUpClass

# Python code to demonstrate working of unittest 
import unittest 
  
class TestStringMethods(unittest.TestCase): 
      
    def setUp(self): 
        pass
  
    # Returns True if the string contains 4 a. 
    def test_strings_a(self): 
        self.assertEqual( 'a'*4, 'aaaa') 
  
    # Returns True if the string is in upper case. 
    def test_upper(self):         
        self.assertEqual('foo'.upper(), 'FOO') 
  
    # Returns TRUE if the string is in uppercase 
    # else returns False. 
    def test_isupper(self):         
        self.assertTrue('FOO'.isupper()) 
        self.assertFalse('Foo'.isupper()) 
  
    # Returns true if the string is stripped and  
    # matches the given output. 
    def test_strip(self):         
        s = 'geeksforgeeks'
        self.assertEqual(s.strip('geek'), 'sforgeeks') 
  
    # Returns true if the string splits and matches 
    # the given output. 
    def test_split(self):         
        s = 'hello world'
        self.assertEqual(s.split(), ['hello', 'world']) 
        with self.assertRaises(TypeError): 
            s.split(2) 
  
if __name__ == '__main__': 
    unittest.main() 

import unittest

class TestStringMethods(unittest.TestCase):

    def test_upper(self):
        self.assertEqual('foo'.upper(), 'FOO')

    def test_isupper(self):
        self.assertTrue('FOO'.isupper())
        self.assertFalse('Foo'.isupper())

    def test_split(self):
        s = 'hello world'
        self.assertEqual(s.split(), ['hello', 'world'])
        # check that s.split fails when the separator is not a string
        with self.assertRaises(TypeError):
            s.split(2)

if __name__ == '__main__':
    unittest.main()

class MyUnitTest(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        do_something_expensive_for_all_sets_of_tests()

class MyFirstSetOfTests(MyUnitTest):
    @classmethod
    def setUpClass(cls):
        super(MyFirstSetOfTests, cls).setUpClass()
        do_something_expensive_for_just_these_first_tests()