Python testing tutorial

simplest_python_testing.py

"""
Run with either:

 - $ python testing_example.py

OR


 - $ pytest -v testing_example.py

"""


def sum_numbers(a, b):
    result = a + b
    print(f'DEBUG: {a} + {b} = {result}')
    return result

def test_sum_numbers_positive():
    """
    Something goes here.
    """
    assert sum_numbers(1, 2) == 3

def test_sum_numbers_zero():
    assert sum_numbers(0, 0) == 0

def test_sum_numbers_one_with_zero():
    assert sum_numbers(1, 0) == 1

def test_sum_numbers_flipped_one_with_zero():
    assert sum_numbers(0, 1) == 1


if __name__ == '__main__':
    # Runs if `pytest` isn't used
    test_sum_numbers_positive()
    test_sum_numbers_zero()
    test_sum_numbers_one_with_zero()
    test_sum_numbers_flipped_one_with_zero()