'When getChildWithDefault is invoked, it adds the headers to the
response.'

def test_getChildWithDefault(self):

    resource = _AddHeadersResource(demo.Test(), [('K1', 'V1'), ('K2', 'V2'), ('K1', 'V3')])
    request = DummyRequest([])
    resource.getChildWithDefault('', request)
    self.assertEqual(request.responseHeaders.getRawHeaders('K1'), ['V1', 'V3'])
    self.assertEqual(request.responseHeaders.getRawHeaders('K2'), ['V2'])
