Assertions test a condition in your code that must be met.
A lot of the assertions you’ll write in your tests have to do with values.
You’ll want to assert that something is bigger than 5 or has less than 3 items.

Boolean Tests

Using the method is_palindrome().
The following assertion methods are used for Boolean tests.

• assertTrue(x) – Make sure x is True
• assertFalse(x) – Make sure x False

import unittest
from string_fun import is_palindrome

class PalindromeTestCase(unittest.TestCase):
    def test_good_palindrome(self):
        self.assertTrue(is_palindrome("KLFIFLK"))
      
    def test_bad_palindrome(self):
        self.assertFalse(is_palindrome('KLFIFLK1'

Equality Tests

The following assertion methods are used as equality and comparison tests.

• assertEqual(x, y) – Make sure x and y are equal
• assertNotEqual(x, y) – Make sure x and y are not equal
• assertGreater(x, y) – Make sure x is greater than y
• assertLess(x, y) – Make sure x is less than y
• assertGreaterEqual(x, y) – Make sure x is greater than or equal to y
• assertLessEqual(x, y) – Make sure x is less than or equal to y

Rock-Paper-Scissors Example

We’re going to test the script moves.py and in it there are Rock, Paper, and Scissors classes that we can create objects from that have better_than and worse_than attributes.

import unittest
import moves

class MoveTests(unittest.TestCase):
    def setUp(self):
        self.rock = moves.Rock()
        self.paper = moves.Paper()
        self.scissors = moves.Scissors()

    def test_equal(self):
        self.assertEqual(self.rock, moves.Rock())
        
    def test_not_equal(self):
        self.assertNotEqual(self.rock, self.paper)
        
    def test_rock_better_than_scissors(self):
        self.assertGreater(self.rock, self.scissors)
        
    def test_paper_worse_than_scissors(self):
        self.assertLess(self.paper, self.scissors)

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

setUp()
Method that is run before each test. Use this to set up state for the tests.

Run Test

python test.py