pytest：通过固定装置参数化测试用例

Question

您如何编写产生/返回参数化测试参数的夹具（一种方法）？

例如，我有一个测试如下：

@pytest.mark.parametrize(

    "input,expected", 

    [("hello", "hello"),

    ("world", "world")])

def test_get_message(self, input, expected):

    assert expected == MyClass.get_message(input)

我对以下方法感兴趣，而不是通过input和expected传递：@pytest.mark.parametrize

@pytest.fixture(scope="session")

def test_messages(self):

    # what should I write here to return multiple 

    # test case with expected value for each?

    pass

def test_get_message(self, test_messages):

    expected = test_messages["expected"] # somehow extracted from test_messages?

    input = test_messages["input"]       # somehow extracted from test message?

    assert expected == MyClass.get_message(input)

Answer 1

要将参数移动到夹具中，您可以使用夹具参数：@pytest.fixture(params=[("hello", "hello"),    ("world", "world")], scope="session")def test_messages(self, request):    return request.paramdef test_get_message(self, test_messages):    input = test_messages[0]       expected = test_messages[1]    assert expected == MyClass.get_message(input)您还可以将参数放入单独的函数中（与 wih 相同parametrize），例如def get_test_messages():    return [("hello", "hello"), ("world", "world")]@pytest.fixture(params=get_test_messages(), scope="session")def test_messages(self, request):    return request.param

Answer 2

对我来说，你似乎想返回一个字典数组：@pytest.fixture(scope="session")def test_messages():    return [        {            "input": "hello",            "expected": "world"        },        {            "input": "hello",            "expected": "hello"        }    ]要在测试用例中使用它，您需要遍历数组：def test_get_message(self, test_messages):    for test_data in test_messages:        input = test_data["input"]        expected = test_data["expected"]        assert input == expected但我不确定这是否是最好的方法，因为它仍然被视为只有一个测试用例，因此它只会在输出/报告中显示为一个测试用例。