client = TestClient(app)
    response = client.get("/items/foo")
    assert response.status_code == 200, response.text
    assert (
        b'<h1><a href="http://testserver/items/foo">Item ID: foo</a></h1>'
        in response.content
    )
    response = client.get("/static/styles.css")
    assert response.status_code == 200, response.text
    assert b"color: green;" in response.content