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WebdriverIO

This WebDriver testing example will use WebdriverIO, and its testing suite. It is expected to have Node.js already installed, along with npm or yarn although the finished example project uses yarn.

Create a Directory for the Tests

Let’s create a space to write these tests in our project. We will be using a nested directory for this example project as we will later also go over other frameworks, but typically you only need to use one. Create the directory we will use with mkdir -p webdriver/webdriverio. The rest of this guide assumes you are inside the webdriver/webdriverio directory.

Initializing a WebdriverIO Project

We will be using a pre-existing package.json to bootstrap this test suite because we have already chosen specific WebdriverIO config options and want to showcase a simple working solution. The bottom of this section has a collapsed guide on setting it up from scratch.

package.json:

{
  "name": "webdriverio",
  "version": "1.0.0",
  "private": true,
  "scripts": {
    "test": "wdio run wdio.conf.js"
  },
  "dependencies": {
    "@wdio/cli": "^7.9.1"
  },
  "devDependencies": {
    "@wdio/local-runner": "^7.9.1",
    "@wdio/mocha-framework": "^7.9.1",
    "@wdio/spec-reporter": "^7.9.0"
  }
}

We have a script that runs a WebdriverIO config as a test suite exposed as the test command. We also have various dependencies added by the @wdio/cli command when we first set it up. In short, these dependencies are for the most simple setup using a local WebDriver runner, Mocha as the test framework, and a simple Spec Reporter.

Click me if you want to see how to set a project up from scratch

The CLI is interactive, and you may choose the tools to work with yourself. Note that you will likely diverge from the rest of the guide, and you need to set up the differences yourself.

Let’s add the WebdriverIO CLI to this npm project.

npm install @wdio/cli

To then run the interactive config command to set up a WebdriverIO test suite, you can then run:

npx wdio config

Config

You may have noticed that the test script in our package.json mentions a file wdio.conf.js. That’s the WebdriverIO config file which controls most aspects of our testing suite.

wdio.conf.js:

const os = require('os');
const path = require('path');
const { spawn, spawnSync } = require('child_process');


// keep track of the `tauri-driver` child process
let tauriDriver;


exports.config = {
  specs: ['./develop/tests/specs/**/*.js'],
  maxInstances: 1,
  capabilities: [
    {
      maxInstances: 1,
      'tauri:options': {
        application: '../../target/release/hello-tauri-webdriver',
      },
    },
  ],
  reporters: ['spec'],
  framework: 'mocha',
  mochaOpts: {
    ui: 'bdd',
    timeout: 60000,
  },


  // ensure the rust project is built since we expect this binary to exist for the webdriver sessions
  onPrepare: () => spawnSync('cargo', ['build', '--release']),


  // ensure we are running `tauri-driver` before the session starts so that we can proxy the webdriver requests
  beforeSession: () =>
    (tauriDriver = spawn(
      path.resolve(os.homedir(), '.cargo', 'bin', 'tauri-driver'),
      [],
      { stdio: [null, process.stdout, process.stderr] }
    )),


  // clean up the `tauri-driver` process we spawned at the start of the session
  afterSession: () => tauriDriver.kill(),
};

If you are interested in the properties on the exports.config object, I suggest reading the documentation. For non-WDIO specific items, there are comments explaining why we are running commands in onPrepare, beforeSession, and afterSession. We also have our specs set to "./develop/tests/specs/**/*.js", so let’s create a spec now.

Spec

A spec contains the code that is testing your actual application. The test runner will load these specs and automatically run them as it sees fit. Let’s create our spec now in the directory we specified.

test/specs/example.e2e.js:

// calculates the luma from a hex color `#abcdef`
function luma(hex) {
  if (hex.startsWith('#')) {
    hex = hex.substring(1);
  }


  const rgb = parseInt(hex, 16);
  const r = (rgb >> 16) & 0xff;
  const g = (rgb >> 8) & 0xff;
  const b = (rgb >> 0) & 0xff;
  return 0.2126 * r + 0.7152 * g + 0.0722 * b;
}


describe('Hello Tauri', () => {
  it('should be cordial', async () => {
    const header = await $('body > h1');
    const text = await header.getText();
    expect(text).toMatch(/^[hH]ello/);
  });


  it('should be excited', async () => {
    const header = await $('body > h1');
    const text = await header.getText();
    expect(text).toMatch(/!$/);
  });


  it('should be easy on the eyes', async () => {
    const body = await $('body');
    const backgroundColor = await body.getCSSProperty('background-color');
    expect(luma(backgroundColor.parsed.hex)).toBeLessThan(100);
  });
});

The luma function on top is just a helper function for one of our tests and is not related to the actual testing of the application. If you are familiar with other testing frameworks, you may notice similar functions being exposed that are used, such as describe, it, and expect. The other APIs, such as items like $ and its exposed methods, are covered by the WebdriverIO API docs.

Running the Test Suite

Now that we are all set up with config and a spec let’s run it!

npm test

We should see output the following output:

➜  webdriverio git:(main) ✗ yarn test
yarn run v1.22.11
$ wdio run wdio.conf.js


Execution of 1 workers started at 2021-08-17T08:06:10.279Z


[0-0] RUNNING in undefined - /develop/tests/specs/example.e2e.js
[0-0] PASSED in undefined - /develop/tests/specs/example.e2e.js


 "spec" Reporter:
------------------------------------------------------------------
[wry 0.12.1 linux #0-0] Running: wry (v0.12.1) on linux
[wry 0.12.1 linux #0-0] Session ID: 81e0107b-4d38-4eed-9b10-ee80ca47bb83
[wry 0.12.1 linux #0-0]
[wry 0.12.1 linux #0-0] » /develop/tests/specs/example.e2e.js
[wry 0.12.1 linux #0-0] Hello Tauri
[wry 0.12.1 linux #0-0]    ✓ should be cordial
[wry 0.12.1 linux #0-0]    ✓ should be excited
[wry 0.12.1 linux #0-0]    ✓ should be easy on the eyes
[wry 0.12.1 linux #0-0]
[wry 0.12.1 linux #0-0] 3 passing (244ms)




Spec Files:   1 passed, 1 total (100% completed) in 00:00:01


Done in 1.98s.

We see the Spec Reporter tell us that all 3 tests from the test/specs/example.e2e.js file, along with the final report Spec Files: 1 passed, 1 total (100% completed) in 00:00:01.

Using the WebdriverIO test suite, we just easily enabled e2e testing for our Tauri application from just a few lines of configuration and a single command to run it! Even better, we didn’t have to modify the application at all.

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