问题描述
当使用 python 3 中的 unittest
库时,我只想在测试失败时执行一些操作(但这应该在类级别上,因此我不必为每个测试).例如,当使用 behave 时,有类似的东西:
When using the unittest
library from python 3 I would like to do some actions only if a test fails (but this should be on a class level so I don't have to write it for each test). For example when using behave there was something like:
def after_step(context, step):
if step.status == "failed":
...
unittest
库是否有类似的东西?如果没有,做类似事情的最简单方法是什么?
Is there something similar for the unittest
library and if not, what would be the easiest approach to do something similar?
推荐答案
我最近正在尝试做类似的事情,但我找到了出路:
I am trying to do something similarly recently and I found a way out:
import unittest
class MyTestResult(unittest.TestResult):
def addFailure(self, test, err):
# here you can do what you want to do when a test case fails
print('test failed!')
super(MyTestResult, self).addFailure(test, err)
def addError(self, test, err):
# here you can do what you want to do when a test case raises an error
super(MyTestResult, self).addError(test, err)
class MyUT(unittest.TestCase):
def test_fail(self):
self.assertEqual(1, 2, '123')
self.assertTrue("ABc".isupper())
if __name__ == '__main__':
unittest.main(testRunner=unittest.TextTestRunner(resultclass=MyTestResult))
如果想根据不同的测试用例类做不同的工作,可以这样实现:
If you want to do different work according to different test case class, you can achieve it like this:
import unittest
class MyUT(unittest.TestCase):
class TestResult(unittest.TestResult):
def addFailure(self, test, err):
print('do something when test case failed')
super(MyUT.TestResult, self).addFailure(test, err)
def addError(self, test, err):
print('test case error')
super(MyUT.TestResult, self).addError(test, err)
def test_fail(self):
self.assertEqual(1, 2, "1=2")
class MyUT2(unittest.TestCase):
class TestResult(unittest.TestResult):
def addFailure(self, test, err):
print('do something else when test case failed')
super(MyUT2.TestResult, self).addFailure(test, err)
def addError(self, test, err):
print('test case error')
super(MyUT2.TestResult, self).addError(test, err)
def test_fail(self):
self.assertEqual(1, 2, "1=2")
if __name__ == '__main__':
classes = [MyUT, MyUT2]
for c in classes:
suite = unittest.TestLoader().loadTestsFromTestCase(c)
unittest.TextTestRunner(resultclass=c.TestResult).run(suite)
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