python-unittest

1. unittest module包含了編寫運行unittest的功能，自定義的test class都要集成unitest.TestCase類，test method要以test開頭，運行順序根據test method的名字排序，特殊方法:

① setup():每個測試函數運行前運行
② teardown():每個測試函數運行完後執行
③ setUpClass():必須使用@classmethod 裝飾器,所有test運行前運行一次
④ tearDownClass():必須使用@classmethod裝飾器,所有test運行完後運行一次

2. 示例代碼:

#文件名runtest.py

import random

import unittest

 

class TestSequenceFunctions(unittest.TestCase):

 

  def setUp(self):

    self.seq = list(range(10))

 

  def test_shuffle(self):

    # make sure the shuffled sequence does not lose any elements

    random.shuffle(self.seq)

    self.seq.sort()

    self.assertEqual(self.seq, list(range(10)))

 

    # should raise an exception for an immutable sequence

    self.assertRaises(TypeError, random.shuffle, (1,2,3))

 

  def test_choice(self):

    element = random.choice(self.seq)

    self.assertTrue(element in self.seq)

 

  def test_sample(self):

    with self.assertRaises(ValueError):

      random.sample(self.seq, 20)

    for element in random.sample(self.seq, 5):

      self.assertTrue(element in self.seq)

 

if __name__ == '__main__':

  unittest.main()

3.運行方式:在命令行直接運行這個runtest.py

可以使用unitest.skip裝飾器族跳過test method或者test class,這些裝飾器包括:
① @unittest.skip(reason):無條件跳過測試，reason描述爲什麼跳過測試
② @unittest.skipif(conditition,reason):condititon爲true時跳過測試
③ @unittest.skipunless(condition,reason):condition不是true時跳過測試

可以自定義skip decorator

#這是一個自定義的skip decorrator

def skipUnlessHasattr(obj, attr):

  if hasattr(obj, attr):

    return lambda func: func

  return unittest.skip("{!r} doesn't have {!r}".format(obj, attr))

skip decorator示例代碼:

class MyTestCase(unittest.TestCase):

 

  @unittest.skip("demonstrating skipping")

  def test_nothing(self):

    self.fail("shouldn't happen")

 

  @unittest.skipIf(mylib.__version__ < (1, 3),

           "not supported in this library version")

  def test_format(self):

    # Tests that work for only a certain version of the library.

    pass

 

  @unittest.skipUnless(sys.platform.startswith("win"), "requires Windows")

  def test_windows_support(self):

    # windows specific testing code

    pass

 

@unittest.skip("showing class skipping")

class MySkippedTestCase(unittest.TestCase):

  def test_not_run(self):

    pass

4.expected failure:使用@unittest.expectedFailure裝飾器，如果test失敗了，這個test不計入失敗的case數目