如何在py.test运行中多次重复每个测试？

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/python
collected 2 items
test.py:4: test_1 PASSED
test.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/python
collected 6 items
test.py:4: test_1[0] PASSED
test.py:4: test_1[1] PASSED
test.py:4: test_1[2] PASSED
test.py:8: test_2[0] PASSED
test.py:8: test_2[1] PASSED
test.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