test_compare.py 文件源码

def verifyStderr(self, method, successRe) :
        """
        Call method() while capturing sys.stderr output internally and
        call self.fail() if successRe.search() does not match the stderr
        output.  This is used to test for uncatchable exceptions.
        """
        stdErr = sys.stderr
        sys.stderr = StringIO()
        try:
            method()
        finally:
            temp = sys.stderr
            sys.stderr = stdErr
            errorOut = temp.getvalue()
            if not successRe.search(errorOut) :
                self.fail("unexpected stderr output:\n"+errorOut)
        if sys.version_info < (3, 0) :  # XXX: How to do this in Py3k ???
            sys.exc_traceback = sys.last_traceback = None