test_01_signin_api.py

def test_sign_in_01(client):
    # Sign in a user by testing the ``POST /signin/`` API endpoint.
    # Uisng the same user as created in the ``test_sign_up_01()`` test.
    response = client.post(
        "/signin/",
        json={"username": "username", "password": "password"},
    )
    assert response.status_code == 200
    assert response.json == {"message": "Logged in"}