对带有承诺链的nodejs类进行单元测试 [英] Unit Test on nodejs class with chain of promise

问题描述

能帮我为Publish方法编写单元测试吗?它应该覆盖左侧提到的那一行.

Can you please help me to write unit test for Publish method. It should cover the line mentioned left side.

导入语句"amqplib"需要被嘲笑.

The import statement 'amqplib' need to be mocked in jest.

ch.publish和conn.close等

ch.publish and conn.close, etc should be asserted

import { Injectable, Inject } from '@nestjs/common';
import * as amqp from 'amqplib';
import { RabbitMQOptions } from '../interface';
import { RABBITMQ_OPTIONS } from '../constant';

@Injectable()
export class EmitDirectService {
  constructor(
    @Inject(RABBITMQ_OPTIONS)
    private readonly rabbitMQOptions: RabbitMQOptions[],
  ) {}

  publish(queueName: string, message: string) {
    let rabbitMQOption = this.rabbitMQOptions.filter(x => x.name == queueName);
    if (!rabbitMQOption) {
      throw Error('Connection string does not exist');
    }
    amqp
      .connect(rabbitMQOption[0].connection)
      .then(function(conn) {
        return conn
          .createChannel()
          .then(function(ch) {
            var ex = rabbitMQOption[0].exchangeName;
            var ok = ch.assertExchange(ex, rabbitMQOption[0].exchangeType, {                        // Need Test Coverage
              durable: false,
            });

            return ok.then(function() {                                                             //Need test coverage all subsequent 2 line
              ch.publish(ex, rabbitMQOption[0].key, Buffer.from(message));

              return ch.close();
            });
          })
          .finally(function() {
            conn.close();                                                                           // Need test Coverage
          });
      })
      .catch(console.warn);
  }
}

推荐答案

听说过Google吗?

Ever heard of Google?

受Nock启发的AMQP模拟和期望库

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