test_nbd.py 文件源码

def test_nbd_not_loaded(self):
        tempdir = self.useFixture(fixtures.TempDir()).path
        n = nbd.NbdMount(self.file, tempdir)

        # Fake out os.path.exists
        def fake_exists(path):
            if path.startswith('/sys/block/nbd'):
                return False
            return ORIG_EXISTS(path)
        self.useFixture(fixtures.MonkeyPatch('os.path.exists', fake_exists))

        # This should fail, as we don't have the module "loaded"
        # TODO(mikal): work out how to force english as the gettext language
        # so that the error check always passes
        self.assertIsNone(n._allocate_nbd())
        self.assertEqual('nbd unavailable: module not loaded', n.error)