def test_router_ssh_key(self, fake_open):
mock_key_file = mock.MagicMock(spec=file)
mock_key_file.read.return_value = 'fake-key'
mock_key_file.__enter__.return_value = mock_key_file
fake_open.return_value = mock_key_file
result = nova._router_ssh_key()
self.assertEqual(result, 'fake-key')
def test_router_ssh_key_not_found(self, fake_open, fake_log):
fake_open.side_effect = IOError
result = nova._router_ssh_key()
self.assertEqual(result, '')
self.assertTrue(fake_log.warning.called)