python - 使用 pytest 参数化类测试

Question

我有一组对象，我需要为我的测试类中的每个测试运行这些对象。我想参数化 TestClass 中的每个测试函数。最终目标是有类似的东西:

@pytest.mark.parametrize('test_input', [1, 2, 3, 4])
class TestClass:
    def test_something1(self, test_input):
        # test code here, runs each time for the parametrize

但是根据我的理解，你不能传递输入参数，或者至少调用 @pytest.mark.parametrize在类里面，这些标记用于 defs不是 class秒

我现在所拥有的:

class TestClass:
    def test_something1(self):
        for i in stuff:
            # test code here

    def test_something2(self):
        for i in stuff:
            # test code here
    ...

有没有办法传递参数化类本身或 TestClass 中的每个函数？ 也许是 @pytest.mark.parametrize里面@pytest.fixture...(autouse=True).
我想将我的测试组织成一个类，因为它反射(reflect)了我正在测试的文件。因为我在至少十几个不同的测试中循环这些对象，所以调用类的循环比在每个 def 中更容易。 .

Answer 1

您可以申请 parametrize到类(class)。来自 the docs :

@pytest.mark.parametrize allows one to define multiple sets of arguments and fixtures at the test function or class.

相同的数据将发送到类中的所有测试方法。

@pytest.mark.parametrize('test_input', [1, 2, 3, 4])
class TestClass:
    def test_something1(self, test_input):
        pass


    def test_something2(self, test_input):
        pass

如果您使用以下内容运行测试 pytest -v您将获得以下输出:

=========================================================================================== test session starts ============================================================================================
platform darwin -- Python 3.7.3, pytest-4.4.2, py-1.8.0, pluggy-0.11.0 -- /Users/user/.local/share/virtualenvs/stack-overlfow-pycharm-L-07rBZ9/bin/python3.7
cachedir: .pytest_cache
rootdir: /Users/user/Documents/spikes/stack-overlfow-pycharm
collected 8 items

test_class.py::TestClass::test_something1[1] PASSED                                                                                                                                                  [ 12%]
test_class.py::TestClass::test_something1[2] PASSED                                                                                                                                                  [ 25%]
test_class.py::TestClass::test_something1[3] PASSED                                                                                                                                                  [ 37%]
test_class.py::TestClass::test_something1[4] PASSED                                                                                                                                                  [ 50%]
test_class.py::TestClass::test_something2[1] PASSED                                                                                                                                                  [ 62%]
test_class.py::TestClass::test_something2[2] PASSED                                                                                                                                                  [ 75%]
test_class.py::TestClass::test_something2[3] PASSED                                                                                                                                                  [ 87%]
test_class.py::TestClass::test_something2[4] PASSED                                                                                                                                                  [100%]

========================================================================================= 8 passed in 0.03 seconds =========================================================================================

这正是您想要的。