python unittest example

unittest_example.py

# python3 -m unittest_example
# python3 -m unittest -v unittest_example
# python3 -m unittest -v unittest_example.Numbers.test_odd

import unittest

class Numbers(unittest.TestCase):

    def test_20(self):
        x = 13
        self.assertEqual(x, 20)

    def test_2(self):
        x = 13
        self.assertEqual(x, 2)

    def test_a(self):
        x = 'a'
        self.assertEqual(x, 'a')

    def test_odd(self):
        x = 13
        self.assertTrue(x % 2 == 1)

    def test_even(self):
        x = 13
        self.assertTrue(x % 2 == 0)

    def test_1(self):
        x = 13
        self.assertEqual(x, 1)

    def test_99(self):
        x = 13
        self.assertEqual(x, 99)

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

"""
# Example 1:
python3 -m unittest -v unittest_example.Numbers.test_odd
test_odd (unittest_example.Numbers) ... ok
----------------------------------------------------------------------
Ran 1 test in 0.000s
OK

# Example 2 (notice ordering of tests):
python3 -m unittest -v unittest_example
test_1 (unittest_example.Numbers) ... FAIL
test_2 (unittest_example.Numbers) ... FAIL
test_20 (unittest_example.Numbers) ... FAIL
test_99 (unittest_example.Numbers) ... FAIL
test_a (unittest_example.Numbers) ... ok
test_even (unittest_example.Numbers) ... FAIL
test_odd (unittest_example.Numbers) ... ok
======================================================================
FAIL: test_1 (unittest_example.Numbers)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../unittest_example.py", line 54, in test_1
    self.assertEqual(x, 1)
AssertionError: 13 != 1

======================================================================
FAIL: test_2 (unittest_example.Numbers)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../unittest_example.py", line 38, in test_2
    self.assertEqual(x, 2)
AssertionError: 13 != 2

======================================================================
FAIL: test_20 (unittest_example.Numbers)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../unittest_example.py", line 34, in test_20
    self.assertEqual(x, 20)
AssertionError: 13 != 20

======================================================================
FAIL: test_99 (unittest_example.Numbers)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../unittest_example.py", line 58, in test_99
    self.assertEqual(x, 99)
AssertionError: 13 != 99

======================================================================
FAIL: test_even (unittest_example.Numbers)
----------------------------------------------------------------------
Traceback (most recent call last):
  File ".../unittest_example.py", line 50, in test_even
    self.assertTrue(x % 2 == 0)
AssertionError: False is not true

----------------------------------------------------------------------
Ran 7 tests in 0.001s

FAILED (failures=5)

# Example 3:
python3 -m unittest unittest_example
FFFF.F.
"""