def METHOD_NAME(self):
    """
    Error if we GET from "/uri" with no ?uri= query-arg
    """
    http_client = create_tahoe_treq_client()
    uri = DecodedURL.from_text(u"http://example.com/uri/")
    resp = http_client.get(uri.to_uri().to_text())
    self.assertThat(
        resp,
        succeeded(
            MatchesStructure(
                code=Equals(400)
            )
        )
    )