import pytest@pytest.mark.parametrize("user, password, expected_error", [
("invalid_user", "pass123", "User does not exist"),
("valid_user", "wrong_pass", "Incorrect password"),
("", "pass123", "Username is required"),
])
def test_login_failures(driver, user, password, expected_error):
login_page = LoginPage(driver)
login_page.login(user, password)
assert expected_error in driver.page_source