pytest_generate_tests 中的 pytest.skip 跳过模块中的所有测试函数而不是特定测试

Question

我使用 pytest_generate_tests 挂钩使用外部 YAML 文件中定义的变量对 pytest 测试进行参数化。变量文件的名称在 pytest 命令行上指定（--params_file）。只有模块内的某些测试函数被参数化，并且需要此文件中的变量。因此，定义变量的命令行选项是一个可选参数。如果从命令行中省略了可选参数，那么我希望 pytest 只是“跳过”那些需要外部参数化变量的测试函数，而只运行未参数化的“其他”测试。问题是，如果省略命令行选项，pytest 将跳过所有测试函数，而不仅仅是需要参数的测试函数。

这是测试模块文件：

def test_network_validate_1(logger, device_connections,):

  ### Test code omitted.....


def test_lsp_throttle_timers(params_file, logger, device_connections):

  ### Test code omitted.....

def test_network_validate_2(logger, device_connections,):

  ### Test code omitted.....

conftest.py 中的 pytest_generate_tests 挂钩：

# Note, I tried scope at function level as well but that did not help
@pytest.fixture(scope='session')
def params_file(request):
    pass

def pytest_generate_tests(metafunc):
  
    ### Get Pytest rootdir
    rootdir = metafunc.config.rootdir

    print(f"*********** Test Function: {metafunc.function.__name__}")

    if "params_file" in metafunc.fixturenames:
        print("*********** Hello Silver ****************")
        if metafunc.config.getoption("--params_file"):

            #################################################################
            # Params file now located as a separate command line argument for
            # greater flexibility
            #################################################################
            params_file = metafunc.config.getoption("--params_file")
            params_doc = dnet_generic.open_yaml_file(Path(rootdir, params_file),
                                                    loader_type=yaml.Loader)

            test_module = metafunc.module.__name__
            test_function = metafunc.function.__name__
            names,values = dnet_generic.get_test_parameters(test_module,
                                                            test_function,
                                                            params_doc,)

            metafunc.parametrize(names, values )
        else:
            pytest.skip("This test requires the params_file argument")

当 params_file 选项存在时，一切正常：

pytest isis/test_isis_lsp_throttle.py --testinfo topoA_r28.yml --ulog -s --params_file common/topoA_params.yml  --collect-only
===================================================================================== test session starts =====================================================================================
platform linux -- Python 3.7.4, pytest-3.7.0, py-1.8.0, pluggy-0.13.0
rootdir: /home/as2863/pythonProjects/p1-automation, inifile: pytest.ini
plugins: csv-2.0.1, check-0.3.5, pylama-7.6.6, dependency-0.4.0, instafail-0.4.0, ordering-0.6, repeat-0.7.0, reportportal-5.0.3
collecting 0 items                                                                                                                                                                            *********** Test Function: test_network_validate_1
*********** Test Function: test_lsp_throttle_timers
*********** Test Function: test_network_validate_2
collected 3 items
<Package '/home/as2863/pythonProjects/p1-automation/isis'>
  <Module 'test_isis_lsp_throttle.py'>
    <Function 'test_network_validate_1'>
    <Function 'test_lsp_throttle_timers'>
    <Function 'test_network_validate_2'>

================================================================================ no tests ran in 0.02 seconds =================================================================================                                                                                                                                                                            

当省略 params_file 选项时，您可以看到没有运行任何测试，并且打印语句显示它甚至没有尝试在“test_network_validate_2”上运行 pytest_generate_tests

pytest isis/test_isis_lsp_throttle.py --testinfo topoA_r28.yml --ulog -s  --collect-only                         ===================================================================================== test session starts =====================================================================================
platform linux -- Python 3.7.4, pytest-3.7.0, py-1.8.0, pluggy-0.13.0
rootdir: /home/as2863/pythonProjects/p1-automation, inifile: pytest.ini
plugins: csv-2.0.1, check-0.3.5, pylama-7.6.6, dependency-0.4.0, instafail-0.4.0, ordering-0.6, repeat-0.7.0, reportportal-5.0.3
collecting 0 items

*********** Test Function: test_network_validate_1
*********** Test Function: test_lsp_throttle_timers
*********** Hello Silver ****************
collected 0 items / 1 skipped

================================================================================== 1 skipped in 0.11 seconds ==================================================================================

Answer 1

正如评论中的讨论所示，您不能使用pytest.skipin pytest_generate_tests，因为它将在模块范围内工作。要跳过具体测试，您可以执行以下操作：

@pytest.fixture
def skip_test():
    pytest.skip('Some reason')

def pytest_generate_tests(metafunc):
    if "params_file" in metafunc.fixturenames:
        if metafunc.config.getoption("--params_file"):
            ...
            metafunc.parametrize(names, values )
        else:
            metafunc.fixturenames.insert(0, 'skip_test')

例如，您引入一个将跳过具体测试的夹具，并将该夹具添加到测试中。确保将其作为第一个夹具插入，这样就不会执行其他夹具。