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C · Testing · intermediate · Week 3–4 · Chapter 8 of 13

Fixtures & parametrization

@pytest.fixture for shared setup. @pytest.mark.parametrize for data-driven tests. conftest.py for shared fixtures.

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Fixtures

Fixture functions provide test data or clients. pytest injects by parameter name.

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Example

import pytest

@pytest.fixture
def sample_users():
    return [{"username": "a"}, {"username": "b"}]

def test_user_count(sample_users):
    assert len(sample_users) == 2

Do this now

Create sample_users fixture returning list of dicts. Use in 2 tests.

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Chapter learning outcomes
  • @pytest.fixture
  • parametrize
  • conftest.py
  • Fixture scope

Clear these before you leave

Side quest

URL builder tests

Parametrize build_url with trailing slash edge cases.