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node.js - Getting error testing readstream response with Jest

问题描述

I am getting timeout error while testing a function that returns readStream from google cloud store.

// Test case
import { createResponse } from 'node-mocks-http';
it('getImage from google cloud storage', async done => {
    let res: Response = createResponse();
    let data = await controller.getImage({ image: "text data"},object, response);
});

// Function that calls google gloud storage and return object.
public async getImage(imageReqDto, baseDto, response){
    let bucket = this.storage.bucket(process.env.IMAGE_BUCKET);
    let file = bucket.file(image);
    return file.createReadStream().pipe(response);;
}

Any solution how to pass the test case successfully after receiving the buffer data.

标签： node.jsjestjsmocha.jsnestjschai

解决方案

这取决于您要测试的内容。如果您只是想确保返回 ReadStream，请尝试使用.toBeInstanceOf()：

it('readstream is returned, when .getImage() is invoked with image data', async () => {
    const response: Response = createResponse();

    const stream = await controller.getImage({image: "text data"}, object, response);

    expect(stream).toBeInstanceOf(ReadStream)
});

然而，更好的测试是了解预期响应并断言 ReadStream 与预期值匹配。如果它是一个小图像，您可以将其加载到缓冲区中并进行比较。如果图像很大，您可以考虑将其存储为 base64 并将实际与预期进行比较。

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