code: function aliSendsMessage() {
      return Promise.all([
          sendMessage(aliTestClient.client),
          expectAliSendMessageRequest(),
      ]).spread(function(_, ciphertext) {
          return ciphertext;
      });
  }
docs: Ali sends a message without first claiming e2e keys. Set the expectations
  and check the results.
  
  @return {promise} which resolves to the ciphertext for Bob's device.