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README.md
WooCommerce End to End Tests
Automated end-to-end tests for WooCommerce.
Table of contents
Pre-requisites
Install Node.js
Follow instructions on the node.js site to install Node.js.
Install NVM
Follow instructions in the NVM repository to install NVM.
Install Docker
Install Docker Desktop if you don't have it installed:
Once installed, you should see Docker Desktop is running message with the green light next to it indicating that everything is working as expected.
Note, that if you install docker through other methods such as homebrew, for example, your steps to set it up will be different. The commands listed in steps below may also vary.
Configuration
This section explains how e2e tests are working behind the scenes. These are not instructions on how to build environment for running e2e tests and run them. If you are looking for instructions on how to run e2e tests, jump to Running tests.
Test Environment
We recommend using Docker for running tests locally in order for the test environment to match the setup on Github CI (where Docker is also used for running tests). An official WordPress Docker image is used to build the site. Once the site using the WP Docker image is built, the current WooCommerce dev branch is mapped into the plugins folder of that newly built test site.
Test Variables
The jest test sequencer uses the following test variables:
{
"url": "http://localhost:8084/",
"users": {
"admin": {
"username": "admin",
"password": "password"
},
"customer": {
"username": "customer",
"password": "password"
}
}
}
If you need to modify the port for your local test environment (eg. port is already in use), edit tests/e2e/config/default.json. Only edit this file while your test container is down.
Jest test sequencer
Jest is being used to run e2e tests. Jest sequencer introduces tools that can be used to specify the order in which the tests are being run. In our case, they are being run in alphabetical order of the directories where tests are located. This way, tests in the directory activate-and-setup will run first. By default, jest runs tests ordered by the time it takes to run the test (the test that takes longer to run will be run first, the test that takes less time to run will run last).
The Setup Wizard e2e test runs first to ensure that WooCommerce is active and that the setup wizard has been completed. This is necessary because docker:up creates a brand new install of WordPress and WooCommerce.
Chromium Download
By default, Puppeteer downloads the Chromium package every time you run npm install or npm update. To disable that download add the following to your .bash_profile or .zshrc (whichever you use):
export PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true
Puppeteer will still automatically download Chromium when needed.
Running tests
Prep work for running tests
Run the following in a terminal/command line window
-
cdto the WooCommerce plugin folder -
git checkout trunk(or the branch where you need to run tests) -
nvm use -
npm install -
composer install --no-dev -
npm run build:assets -
npm install jest --global(this only needs to be done once) -
npx wc-e2e docker:up(this will build the test site using Docker) -
Use
docker psto confirm that the Docker containers are running. You should see a log similar to one below indicating that everything had been built as expected:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c380e1964506 env_wordpress-cli "entrypoint.sh" 7 seconds ago Up 5 seconds woocommerce_e2e_wordpress-cli
2ab8e8439e9f wordpress:5.5.1 "docker-entrypoint.s…" 8 seconds ago Up 7 seconds 0.0.0.0:8084->80/tcp woocommerce_e2e_wordpress-www
4c1e3f2a49db mariadb:10.5.5 "docker-entrypoint.s…" 10 seconds ago Up 8 seconds 3306/tcp woocommerce_e2e_db
Note that by default, Docker will download the latest images available for WordPress, PHP and MariaDB. In the example above, you can see that WordPress 5.5.1 and MariaDB 10.5.5 were used.
See How to run tests using custom WordPress, PHP and MariaDB versions if you'd like to use different versions.
- Navigate to
http://localhost:8084/
If everything went well, you should be able to access the site. If you changed the port to something other than 8084 as per Test Variables section, use the appropriate port to access your site.
As noted in Test Variables section, use the following Admin user details to login:
Username: admin
PW: password
- Run
npx wc-e2e docker:downwhen you are done with running e2e tests and before making any changes to test site configuration.
Note that running npx wc-e2e docker:down and then npx wc-e2e docker:up re-initializes the test container.
How to run tests in headless mode
To run e2e tests in headless mode use the following command:
npx wc-e2e test:e2e
How to run tests in non-headless mode
Tests run in headless mode by default. However, sometimes it's useful to observe the browser while running or developing tests. To do so, you can run tests in a non-headless (dev) mode:
npx wc-e2e test:e2e-dev
The dev mode also enables SlowMo mode. SlowMo slows down Puppeteer’s operations. This makes it easier to see what is happening in the browser.
By default, SlowMo mode adds a 50 millisecond delay between test steps. If you'd like to override the length of the delay and have the tests run faster or slower in the -dev mode, pass PUPPETEER_SLOWMO variable when running tests as shown below:
PUPPETEER_SLOWMO=10 npx wc-e2e test:e2e-dev
The faster you want the tests to run, the lower the value should be of PUPPETEER_SLOWMO should be.
For example:
PUPPETEER_SLOWMO=10- will run tests fasterPUPPETEER_SLOWMO=70- will run tests slower
How to run tests in debug mode
Tests run in headless mode by default. While writing tests it may be useful to have the debugger loaded while running a test in non-headless mode. To run tests in debug mode:
npx wc-e2e test:e2e-debug
When all tests have been completed the debugger remains active. Control doesn't return to the command line until the debugger is closed. Otherwise, debug mode functions the same as non-headless mode.
How to run an individual test
To run an individual test, use the direct path to the spec. For example:
npx wc-e2e test:e2e ./tests/e2e/specs/wp-admin/test-create-order.js
How to skip tests
To skip the tests, use .only in the relevant test entry to specify the tests that you do want to run.
For example, in order to skip Setup Wizard tests, add .only to the login and activation tests as follows in the setup-wizard.test.js:
it.only( 'Can login', async () => {}
it.only( 'Can make sure WooCommerce is activated. If not, activate it', async () => {}
As a result, when you run setup-wizard.test.js, only the login and activate tests will run. The rest will be skipped. You should see the following in the terminal:
PASS tests/e2e/specs/activate-and-setup/setup-wizard.test.js (11.927s)
Store owner can login and make sure WooCommerce is activated
✓ Can login (7189ms)
✓ Can make sure WooCommerce is activated. If not, activate it (1187ms)
Store owner can go through store Setup Wizard
○ skipped Can start Setup Wizard
○ skipped Can fill out Store setup details
○ skipped Can fill out Payment details
○ skipped Can fill out Shipping details
○ skipped Can fill out Recommended details
○ skipped Can skip Activate Jetpack section
○ skipped Can finish Setup Wizard - Ready! section
Store owner can finish initial store setup
○ skipped Can enable tax rates and calculations
○ skipped Can configure permalink settings
You can also use .skip in the same fashion. For example:
it.skip( 'Can start Setup Wizard', async () => {}
Finally, you can apply both .only and .skip to describe part of the test:
describe.skip( 'Store owner can go through store Setup Wizard', () => {}
How to run tests using custom WordPress, PHP and MariaDB versions
The following variables can be used to specify the versions of WordPress, PHP and MariaDB that you'd like to use to build your test site with Docker:
WP_VERSIONTRAVIS_PHP_VERSIONTRAVIS_MARIADB_VERSION
The full command to build the site will look as follows:
TRAVIS_MARIADB_VERSION=10.5.3 TRAVIS_PHP_VERSION=7.4.5 WP_VERSION=5.4.1 npx wc-e2e docker:up
Guide for writing e2e tests
Tools for writing tests
We use the following tools to write e2e tests:
- Puppeteer – a Node library which provides a high-level API to control Chrome or Chromium over the DevTools Protocol
- jest-puppeteer – provides all required configuration to run tests using Puppeteer
- expect-puppeteer – assertion library for Puppeteer
In the WooCommerce Core repository the tests are in tests/e2e/core-tests/specs/ folder. However, if you are writing tests in your own project using WooCommerce Core e2e packages, the tests should be located in tests/e2e/specs/ folder.
The following packages are used in write tests:
@automattic/puppeteer-utils- utilities and configuration for running puppeteer against WordPress. See details in the package's repository.@woocommerce/e2e-utils- this package contains utilities to simplify writing e2e tests specific to WooCommmerce. See details in the package's repository.
Creating test structure
It is a good practice to start working on the test by identifying what needs to be tested on the higher and lower levels. For example, if you are writing a test to verify that merchant can create a virtual product, the overview of the test will be as follows:
- Merchant can create virtual product
- Merchant can log in
- Merchant can create virtual product
- Merchant can verify that virtual product was created
Once you identify the structure of the test, you can move on to writing it.
Writing the test
The structure of the test serves as a skeleton for the test itself. You can turn it into a test by using describe() and it() methods of Jest:
describe()- creates a block that groups together several related tests;it()- actual method that runs the test.
Based on our example, the test skeleton would look as follows:
describe( 'Merchant can create virtual product', () => {
it( 'merchant can log in', async () => {
} );
it( 'merchant can create virtual product', async () => {
} );
it( 'merchant can verify that virtual product was created', async () => {
} );
} );
Next, you can start filling up each section with relevant functions (test building blocks). Note, that we have the @woocommerce/e2e-utils package where many reusable helper functions can be found for writing tests. For example, merchant.js of @woocommerce/e2e-utils package contains merchant object that has login method. As a result, in the test it can be used as await merchant.login(); so the first it() section of the test will become:
it( 'merchant can log in', async () => {
await merchant.login();
} );
Moving to the next section where we need to actually create a product. You will find that we have a reusable function such as createSimpleProduct() in the components.js of @woocommerce/e2e-utils package. However, note that this function should not be used for testing creating a product because the simple product is created using WooCommerce REST API. This is not how the merchant would typically create a virtual product, we would need to test it by writing actual steps for creating a product in the test.
createSimpleProduct() should be used in tests where you need to test something else than creating a simple product. In other words, this function exists in order to quickly fill the site with test data required for running tests. For example, if you want to write a test that will verify that shopper can place a product to the cart on the site, you can use createSimpleProduct() to create a product to test the cart.
Because createSimpleProduct() can't be used in the case of our example test, we'd need to navigate to the page where the user would usually create a product. To do that, there is openNewProduct() function of the merchant object that we already used above. As a result, that part of the test will look as follows:
it( 'merchant can create virtual product', async () => {
await merchant.openNewProduct();
} );
You would then continue writing the test using utilities where possible.
Make sure to utilize the functions of the @automattic/puppeteer-utils package where possible. For example, if you need to wait for a certain element to be ready to be clicked on and then click on it, you can use waitAndClick() function:
await waitAndClick( page, '#selector' );
Best practices
- It is best to keep the tests inside
describe()block granular as it helps to debug the test if it fails. When the test has finished, you will see the result along with the breakdown of how each of the test sections performed. If one of the tests withindescribe()block fails, it will be shown as follows:
FAIL ../specs/front-end/front-end-my-account.test.js (9.219s)
My account page
✓ allows customer to login (2924ms)
✓ allows customer to see orders (1083ms)
x allows customer to see downloads (887ms)
✓ allows customer to see addresses (1161ms)
✓ allows customer to see account details (1066ms)
In the example above, you can see that allows customer to see downloads part of the test failed and can start looking at it right away. Without steps the test goes through being detailed, it is more difficult to debug it.
Debugging tests
The test sequencer (npx wc-e2e test:e2e) includes support for saving screenshots on test errors which can be sent to a Slack channel via a Slackbot.
For Puppeteer debugging, follow Google's documentation.