Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://github.com/philschatz/fetch-vcr below:

philschatz/fetch-vcr: :vhs: Stop mocking HTTP Requests! Just record and then play them back

Stop mocking HTTP Requests. Just record and then play them back. See vcr/vcr for the main idea.

After setting up (see below), the basics are:

1. set the VCR_MODE=cache environment variable before running your tests
2. run your tests

This will record (and load) all the HTTP responses into the ./_fixtures/ directory.

And when you run the steps again, viola! no network traffic happens.

• playback: (default) only uses the local fixture files
• cache: tries to use the recorded response and if not found then it is fetched and then saved (useful when adding new tests)
• record: forces HTTP requests and responses are saved to the filesystem (useful for regenerating all the fixtures)

You can set the mode either by:

• setting the VCR_MODE=record environment variable when running tests (NodeJS)
• explicitly running fetch.configure({mode: 'record'}) (NodeJS or browser)

There are separate examples for NodeJS, Jest, and in a browser (PhantomJS or Selenium)

Here is how you would use it in a typical NodeJS app:

// import fetch from 'fetch';
import fetch from 'fetch-vcr';

// Configure where the recordings should be loaded/saved to.
// The path is relative to `process.cwd()` but can be absolute.
fetch.configure({
  fixturePath: './_fixtures',
  // mode: 'record'     <-- This is optional
})

// Use fetch like you would normally
fetch('http://openstax.org')
.then(response => {
  console.log(response.ok)
})

Here is how you would configure it to ignore certain request:

// import fetch from 'fetch';
import fetch from 'fetch-vcr';

// Configure where the recordings should be loaded/saved to.
// The path is relative to `process.cwd()` but can be absolute.
fetch.configure({
  fixturePath: './_fixtures',
  ignoreUrls: [/.+weedmaps\.com.+/] // <-- This is an array of Regular Expressions
  // mode: 'record'     <-- This is optional
})

fetch('https://weedmaps.com/sitemap') // <-- This will be ignored from vcr
.then(response => {
  console.log(response)
})

You can check response.wasCached. It will be true if the response was loaded from the cache.

import fetch from 'fetch-vcr';

fetch('https://philschatz.com').then(response => {
  if (!response.wasCached) {
    sleep(1000) // wait before making another request
  }
})

Just add the following to package.json:

  "jest": {
    "moduleNameMapper": {
      "hack-node-fetch": "node-fetch",
      "node-fetch": "fetch-vcr"
    }
  }

If you want to check which calls were made, you can use the following:

// Returns an array of {url, args, hash, bodyFilename, response, optionsFilename}
const allCalls = fetchVCR.getCalled()

// Clears the array of calls made
fetchVCR.clearCalled()

Many apps use jsdom for testing which makes it really easy to add fetch-vcr. Just replace the global fetch function with fetchVCR and you can record/play back the cassettes. See below for an example:

var fs = require('fs')
var jsdom = require('jsdom')
var fetchVCR = require('fetch-vcr')

// Configure the path to find cassettes
fetchVCR.configure({
  fixturePath: './_fixtures/'
})

var dom = new jsdom.JSDOM(fs.readFileSync('./jsdom-example.html'), {
  runScripts: 'dangerously',
  beforeParse: (window) => {
    // This changes the fetch global to be fetchVCR
    window.fetch = fetchVCR
  }
})

It is easy to record HTTP requests in NodeJS and play them back in the browser.

To play them back in a browser, just run fetchVCR.configure({fixturePath: './path/to/_fixtures'}) and fetchVCR will use that path to load the files via AJAX requests.

To record HTTP requests in a browser you will need to do a little bit of work. Loading fixture files is relatively painless (using XMLHTTPRequest) but saving them to disk is non-trivial.

In order to save the fixture files to disk you will need to override fetchVCR.saveFile(rootPath, filename, contents) => Promise.

If you are using PhantomJS you will likely need to use the alert(msg) to get data out of PhantomJS and then save it to the filesystem (using fs.writeFile(...))

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4