Testing with Python

Pytest recipes

Parametrizing fixtures and test functions

Reference: pytest parametrize documentation

import pytest

@pytest.mark.parametrize("test_input,expected", [
    ("3+5", 8),
    ("2+4", 6),
    ("6*9", 54),
])
def test_eval(test_input, expected):
    assert eval(test_input) == expected

Fixtures

import pytest

@pytest.fixture
def bridgekeeper():
    return {"colour": "blue"}

def test_answer(bridgekeeper):
    assert bridgekeeper["colour"] == "blue"

A fixture is requested by naming it as a test argument; pytest builds it fresh for each test.

Other libraries

• Hypothesis
• Cassette