Using Ids in Pytest

In general, it's best to add an ids parameter to parametrize decorators. In the long run, this makes your code more maintainable.

import pytest
import numpy as np

def normalize(X):
    return (X - X.min())/(X.max() - X.min())

@pytest.mark.parametrize("x", [1, 2, 30], ids=lambda d: f"x={d}")
@pytest.mark.parametrize("y", [1, 2, 30], ids=lambda d: f"y={d}")
def test_shape_same(x, y):
    if x == y:
        pytest.skip("Not of interest")
    X = np.random.normal((x, y))
    X_norm = normalize(X)
    assert X.shape == X_norm.shape

When you now run the unit tests with --verbose you'll see more elaborate information.

# The verbose setting is optional, but gives more information
pytest test_normalise.py --verbose