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：@[e-mail](scope="session")def test_messages(self):    # what should I write here to return multiple     # test case with expected value for each?    passdef 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.param

def 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。