appyToken.setViewerId("ViewerY");
signedRequest = new HttpRequest(URI);
signedRequest.setAuthType(AuthType.SIGNED);
signedRequest.setSecurityToken(appxToken);
signedRequest.setOAuthArguments(new OAuthArguments());
signedRequest.getOAuthArguments().setUseToken(OAuthArguments.UseToken.NEVER);
signedRequest.getOAuthArguments().setSignOwner(true);
signedRequest.getOAuthArguments().setSignViewer(true);
fetcher = new DefaultRequestPipelineTest.FakeHttpFetcher();