Method query

chain-test/src/unit/TestChaincode.ts:197–214

* Queries a chaincode method with read-only access (evaluate transaction). * Changes made during query are not persisted to the state. * * @template T - Expected return type of the query * @param method - Name of the contract method to query * @param args - Arguments to pass to the me

(
    method: string,
    ...args: (string | { serialize: () => string })[]
  )

   * @throws Error if the query fails
   */
  public async query<T = InvokeResponse>(
    method: string,
    ...args: (string | { serialize: () => string })[]
  ): Promise<T> {
    const argsSerialized = args.map((arg) => (typeof arg === "string" ? arg : arg.serialize()));
    const copyOfState = { ...this.state }; // to prevent writes
    const stub = new TestChaincodeStub([method, ...argsSerialized], copyOfState, {});
    stub.mockCreator(this.callingUserMsp, this.callingUser);
    const rawResponse = await this.chaincode.Invoke(stub);

    if (rawResponse.status === 200) {
      const stringResponse = rawResponse.payload.toString();

      return JSON.parse(stringResponse) as T;
    } else {
      throw rawResponse.message;
    }
  }

  /**
   * Gets a direct reference to a contract instance for low-level testing.