message: Added cheking in tests
diff: @@ -724,7 +724,9 @@ mod high_cases {
  let get_txn_request = LedgerUtils::build_get_txn_request(&my_did, get_schema_response.result.seq_no.unwrap()).unwrap();
  - PoolUtils::send_request(pool_handle, &get_txn_request).unwrap();
  + let get_txn_response = PoolUtils::send_request(pool_handle, &get_txn_request).unwrap();
  + let get_schema_response: Reply<GetSchemaReplyResult> = serde_json::from_str(&get_txn_response).unwrap();
  + assert!(get_schema_response.result.data.is_some());
  TestUtils::cleanup_storage();
  }
  @@ -760,7 +762,9 @@ mod high_cases {
  let get_txn_request = LedgerUtils::build_get_txn_request(&my_did, get_schema_response.result.seq_no.unwrap() + 1).unwrap();
  - PoolUtils::send_request(pool_handle, &get_txn_request).unwrap();
  + let get_txn_response = PoolUtils::send_request(pool_handle, &get_txn_request).unwrap();
  + let get_schema_response: Reply<GetSchemaReplyResult> = serde_json::from_str(&get_txn_response).unwrap();
  + assert_eq!(res.unwrap_err(), ErrorCode::CommonInvalidStructure);
  TestUtils::cleanup_storage();
  }
  