Your first test

pytest finds files named test_*.py and runs every function starting with test_. Use assert to check results.

Key points

test_ functions in test_ files
assert checks a condition
Run with: pytest

# passwords.py
def score(pw):
    return 0 if pw == "password" else len(pw)

# test_passwords.py
from passwords import score

def test_common_password_scores_zero():
    assert score("password") == 0

def test_longer_scores_more():
    assert score("abcdefghij") > score("abc")

Your turn

Write three tests for your password checker from App 3 and run pytest.

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Quiz · +10 XP

Your first test

Key points

How does pytest find tests?