unittest的使用三——断言

常用的断言有3种：

判断两个值是不是都相等，参数分别是第一个值，第二个值，msg代表不想等的话，描述的信息

def assertEqual(self, first, second, msg=None):
    """Fail if the two objects are unequal as determined by the '=='
       operator.
    """
    assertion_func = self._getAssertEqualityFunc(first, second)
    assertion_func(first, second, msg=msg)

判断返回的是不是true

def assertTrue(self, expr, msg=None):
    """Check that the expression is true."""
    if not expr:
        msg = self._formatMessage(msg, "%s is not true" % safe_repr(expr))
        raise self.failureException(msg)

判断返回的两个值是不是不想等

def assertNotEqual(self, first, second, msg=None):
    """Fail if the two objects are equal as determined by the '!='
       operator.
    """
    if not first != second:
        msg = self._formatMessage(msg, '%s == %s' % (safe_repr(first),
                                                      safe_repr(second)))
        raise self.failureException(msg)