前言
当测试用例写完后，有些模块有改动时候，会影响到部分用例的执行，这个时候我们希望暂时跳过这些用例。
或者前面某个功能运行失败了，后面的几个用例是依赖于这个功能的用例，如果第一步就失败了，后面的用例也就没必要去执行了，直接跳过就行，节省用例执行时间。
一、skip装饰器
skip装饰器一共有四个
@unittest.skip(reason)
- Unconditionally skip the decorated test. reason should describe why the test is being skipped.
翻译：无条件跳过用例，reason是说明原因
@unittest.skipIf(condition, reason)- Skip the decorated test if condition is true.
翻译：condition为true的时候跳过
@unittest.skipUnless(condition, reason)- Skip the decorated test unless condition is true.
翻译：condition为False的时候跳过
@unittest.expectedFailure- Mark the test as an expected failure. If the test fails when run, the test is not counted as a failure.
翻译：断言的时候跳过(暂时不知道有啥用，没看懂，貌似断言失败，也变成用例pass了。)
二、skip案例
运行结果：
测试1
测试4
.ssx
----------------------------------------------------------------------
Ran 4 tests in 0.003s
OK (skipped=2, expected failures=1)
三、跳过整个测试类
四、参考代码：
# coding:utf-8
import unittest
class Test(unittest.TestCase):
@unittest.skip(u"无条件跳过此用例")
def test_1(self):
print "测试1"
@unittest.skipIf(True, u"为True的时候跳过")
def test_2(self):
print "测试2"
@unittest.skipUnless(False, u"为False的时候跳过")
def test_3(self):
print "测试3"
@unittest.expectedFailure
def test_4(self):
print "测试4"
self.assertEqual(2, 4, msg=u"判断相等")
if __name__ == "__main__":
unittest.main()