如何在 nestjs 中为具有请求和响应访问权限的第三方库创建自定义提供程序

问题描述

我在 nestjs 中有一个控制器，如下所示

I have a controller in nestjs as below

import * as dialogflow from 'dialogflow-fulfillment';
import { Request, Response } from 'express';

@Controller('dialogflow-fulfillment')
export class DialogflowFulfillmentController {

    @Post()
    async fulfill(@Req() request: Request, @Res() response: Response) {

        const agent = new dialogflow.WebhookClient({ request, response });

    }
}

现在为了能够对这个控制器进行单元测试，我想使用自定义提供程序并提供一个 WebhookClient 实例.

Now for being able to unit test this controller I want to use custom provider and provide an instance of WebhookClient.

类似于下面的内容

    {
      provide: 'WebhookService',
      useFactory: async () => new dialogflow.WebhookClient({??,??})
    }

但问题是我需要访问 request 和 response 的实例来创建一个新实例.

but problem is I need to get access to instance of request and response to create a new instance.

我该怎么做?以及如何在fulfill的每次调用中注入?

How can I do that? And how to inject it in each calls of fulfill?

推荐答案

在这种情况下，我建议在库周围编写一个外观(包装器).外观不需要进行单元测试，因为它只是传播参数并且不包含逻辑(您可以编写一个外观测试"来代替它本质上测试库代码，我认为集成测试更适合):

In this case I'd suggest to write a facade (wrapper) around the library. The facade does not need to be unit tested since it simply propagates the parameters and does not contain logic (you could write a "facade test" instead which essentially tests the library code, I'd say an integration test is a better fit):

@Injectable()
export class WebHookClientFacade {
  create(request, response) {
    return new dialogflow.WebhookClient({ request, response });
  }
}

并在您的控制器中使用现在可测试的外观:

And use the facade in your controller that is now testable:

constructor(private webHookClientBuilder: WebHookClientFacade) {}

@Post()
async fulfill(@Req() request: Request, @Res() response: Response) {
    const agent = this.webHookClientBuilder.create(request, response);

}

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