cypress-har-generator

Generate HTTP Archive (HAR) while running tests

Install

Run npm i --save-dev @neuralegion/cypress-har-generator to install the plugin.

✴ For details about changes between versions, and information about updates on previous releases, see the Releases tab on GitHub: https://github.com/NeuraLegion/cypress-har-generator/releases

Quick Start

First, install cypress-har-generator as development dependency:

npm i --save-dev @neuralegion/cypress-har-generator

Next, go to the cypress's directory and put this code is in your cypress/plugins/index.js file:

const { install, ensureBrowserFlags } = require('@neuralegion/cypress-har-generator');

module.exports = (on, config) => {
  install(on, config);
  
  on('before:browser:launch', (browser = {}, launchOptions) => {
    ensureBrowserFlags(browser, launchOptions);
    return launchOptions;
  });
};

After then, you should register commands that perform the manipulation with the HAR file. For that add this module to your support file cypress/support/index.js:

require('@neuralegion/cypress-har-generator/commands');

Once the configuration is completed, add the following code into each test:

// cypress/integration/users.spec.js

describe('my tests', () => {
  before(() => {
    // start recording
    cy.recordHar();
  });

  after(() => {
    // HAR will be saved as users.spec.har 
    // at the root of the project 
    cy.saveHar();
  });
});

After then, you can start the tests with:

cypress run --browser chrome

✴ Now only Chrome family browsers are supported.

When the cypress finished executing tests, the plugin will save a new archive at the root of the project. By default, a HAR is saved to a file with a name including the current spec’s name: {specName}.har

Commands

recordHar

Starts recording network logs. The plugin records all network requests so long as the browser session is open.

cy.recordHar();

You can set content flag to false to skip loading content fields in the HAR.

cy.recordHar({ content: false });

To include only requests on specific hosts, you can specify a list of hosts using includeHosts.

cy.recordHar({ includeHosts: [ '.*.execute-api.eu-west-1.amazonaws.com'] });

To exclude some requests, you can specify a list of paths to be excluded using excludePaths.

cy.recordHar({ excludePaths: ['^/login', 'logout$'] });

saveHar

Stops recording and save all requests that have occurred since you run recording to the HAR file.

cy.saveHar();

Pass a filename to change the default naming behavior.

cy.saveHar({ fileName: 'example.com.har' });

Pass an output directory to change the destination folder manually. It allows overriding the value, that is specified in the cypress.json

cy.saveHar({ outDir: './hars' });

Generate HAR file only for chrome, if it is not interactive run, and if test failed.

beforeEach(() => {
  const isInteractive = Cypress.config('isInteractive');
  const isChrome = Cypress.browser.name === 'chrome';
  if (!isInteractive && isChrome) {
    cy.recordHar();
  }
});

afterEach(() => {
  const { state } = this.currentTest;
  const isInteractive = Cypress.config('isInteractive');
  const isChrome = Cypress.browser.name === 'chrome';
  if (!isInteractive && isChrome && state !== 'passed') {
    cy.saveHar();
  }
});

If you want to change the path to the files, you can specify it by setting the hars_folder environment variable.

cypress run --browser chrome --env hars_folders=cypress/hars

License

Copyright © 2021 NeuraLegion.

This project is licensed under the MIT License - see the LICENSE file for details.