test_paths.py 文件源码

def testCrossMountMoveTo(self):
        """
        """
        # Bit of a whitebox test - force os.rename, which moveTo tries
        # before falling back to a slower method, to fail, forcing moveTo to
        # use the slower behavior.
        invokedWith = []
        def faultyRename(src, dest):
            invokedWith.append((src, dest))
            if len(invokedWith) == 2:
                raise OSError(errno.EXDEV, 'Test-induced failure simulating cross-device rename failure')
            return originalRename(src, dest)

        originalRename = os.rename
        os.rename = faultyRename
        try:
            self.testMoveTo()
            # A bit of a sanity check for this whitebox test - if our rename
            # was never invoked, the test has probably fallen into
            # disrepair!
            self.failUnless(len(invokedWith) >= 2)
        finally:
            os.rename = originalRename