为了多次运行每个测试，我们将在生成测试时以编程方式对每个测试进行参数化。
首先，让我们添加解析器选项（在您的conftest.py中添加以下内容）：
def pytest_addoption(parser): parser.addoption('--repeat', action='store', help='Number of times to repeat each test')现在，我们添加一个“ pytest_generate_tests”挂钩。这就是魔术发生的地方。
def pytest_generate_tests(metafunc): if metafunc.config.option.repeat is not None: count = int(metafunc.config.option.repeat) # We're going to duplicate these tests by parametrizing them, # which requires that each test has a fixture to accept the parameter. # We can add a new fixture like so: metafunc.fixturenames.append('tmp_ct') # Now we parametrize. This is what happens when we do e.g., # @pytest.mark.parametrize('tmp_ct', range(count)) # def test_foo(): pass metafunc.parametrize('tmp_ct', range(count))在没有重复标志的情况下运行：
(env) $ py.test test.py -vv============================= test session starts ==============================platform darwin -- Python 2.7.5 -- py-1.4.20 -- pytest-2.5.2 -- env/bin/pythoncollected 2 itemstest.py:4: test_1 PASSEDtest.py:8: test_2 PASSED=========================== 2 passed in 0.01 seconds ===========================
使用重复标志运行：
(env) $ py.test test.py -vv --repeat 3============================= test session starts ==============================platform darwin -- Python 2.7.5 -- py-1.4.20 -- pytest-2.5.2 -- env/bin/pythoncollected 6 itemstest.py:4: test_1[0] PASSEDtest.py:4: test_1[1] PASSEDtest.py:4: test_1[2] PASSEDtest.py:8: test_2[0] PASSEDtest.py:8: test_2[1] PASSEDtest.py:8: test_2[2] PASSED=========================== 6 passed in 0.01 seconds ===========================
进一步阅读：
- https://pytest.org/latest/plugins.html#well-specified-hooks
- https://pytest.org/latest/example/parametrize.html
