final String serviceAccountEmail =
"36680232662-vrd7ji19q3ne0ah2csanun6bnr@developer.gserviceaccount.com";
final String accessToken = "1/MkSJoj1xsli0AccessToken_NKPY2";
MockTokenServerTransport transport = new MockTokenServerTransport();
transport.addServiceAccount(serviceAccountEmail, accessToken);
GoogleCredential credential = new GoogleCredential.Builder()
.setServiceAccountId(serviceAccountEmail)
.setServiceAccountScopes(EMPTY_SCOPES)
.setServiceAccountPrivateKey(SecurityTestUtils.newRsaPrivateKey())
.setTransport(transport)