npm install -D cypress cypress-angular-unit-testAdd to your support file
// cypress/support/index.js
// core-js 3.*
require('core-js/es/reflect');
// core-js 2.*
require('core-js/es7/reflect');
require('cypress-angular-unit-test/support');Create a new file webpack.config.ts in cypress/plugins folder.
You can find the file content here :
npm install -D @cypress/webpack-dev-server html-webpack-pluginEnable component testing in cypress.json.
{
"component": {
"componentFolder": "src/app",
"testFiles": "**/*cy-spec.ts"
}
}Configure cypress/plugins/index.js to transpile Angular code.
const webpackConfig = require('./webpack.config');
const { startDevServer } = require('@cypress/webpack-dev-server');
module.exports = (on, config) => {
on('dev-server:start', (options) =>
startDevServer({
options,
webpackConfig,
}),
);
return config;
};Run npx cypress open-ct
npm install -D @cypress/webpack-preprocessorEnable experimental component testing mode in cypress.json and point at the spec files. Usually they are alongside your application files in src folder.
{
"experimentalComponentTesting": true,
"componentFolder": "src",
"testFiles": "**/*cy-spec.*"
}Configure cypress/plugins/index.js to transpile Angular code.
const wp = require('@cypress/webpack-preprocessor');
const webpackConfig = require('./webpack.config');
module.exports = (on, config) => {
const options = {
webpackConfig,
};
on('file:preprocessor', wp(options));
return config;
};Run npx cypress open
import { mount } from 'cypress-angular-unit-test';
import { AppComponent } from './app.component';
describe('AppComponent', () => {
it('shows the input', () => {
// Init Angular stuff
initEnv(AppComponent);
// You can also :
// initEnv({declarations: [AppComponent]});
// initEnv({imports: [MyModule]});
// component + any inputs object
mount(AppComponent, { title: 'World' });
// use any Cypress command afterwards
cy.contains('Welcome to World!');
});
});
| Use case | Description |
|---|---|
| Input | Test inject @Input() value |
| Output | Test catching @Output() |
| Bootstrap | Bootstrap integration with style : setConfig({ stylesheet: 'https://...}); |
| Add style | Add custom style for testing : setConfig({ style: 'p {background-color: blue;}' }); |
| HTML mount | Mount a component with html, don't forget to call detectChanges() after |
| Image Snapshot | Mount a component and visual asserting |
| Material | Material integration |
| Prime NG | PrimeNG integration |
| OnPush strategy | Component with changeDetection: ChangeDetectionStrategy.OnPush need call detectChanges() |
| Directive | Test directive with mountHtml |
| Pipe | Test pipe with mountHtml |
| Stub service | Stub a service with Observable |
| Only service | Test a service without a component |
| Web Component | Test a custom element with shadow dom |
| Assets | assets folder accessible by Cypress |
| Async | Async test with cy.tick |
| Routing | Test routing link |
| Network | Test with http calls |
| NGRX | NGRX store |
- Install ngx-build-plus to extends the Angular CLI's build process and instrument the code
npm i -D ngx-build-plus
- Add webpack coverage config file coverage.webpack.js to cypress folder
module.exports = {
module: {
rules: [
{
test: /\.(js|ts)$/,
loader: 'istanbul-instrumenter-loader',
options: { esModules: true },
enforce: 'post',
include: require('path').join(__dirname, '..', 'src'),
exclude: [
/\.(e2e|spec)\.ts$/,
/node_modules/,
/(ngfactory|ngstyle)\.js/,
],
},
],
},
};- Update
angular.jsonto use ngx-build with extra config
"serve": {
"builder": "ngx-build-plus:dev-server",
"options": {
"browserTarget": "cypress-angular-coverage-example:build",
"extraWebpackConfig": "./cypress/coverage.webpack.js"
},
}- Instrument JS files with istanbul for code coverage reporting
npm i -D istanbul-instrumenter-loader
- Add cypress code coverage plugin
npm install -D @cypress/code-coverage
- Then add the code below to your supportFile and pluginsFile
// cypress/support/index.js
import '@cypress/code-coverage/support';
// cypress/plugins/index.js
module.exports = (on, config) => {
require('@cypress/code-coverage/task')(on, config);
return config;
};source : https://github.com/skylock/cypress-angular-coverage-example
- Instrument JS files with istanbul for code coverage reporting
npm i -D istanbul-instrumenter-loader
- In your
cypress/plugins/cy-ts-preprocessor.tsadd this rule
rules: [
{
test: /\.(js|ts)$/,
loader: 'istanbul-instrumenter-loader',
options: { esModules: true },
enforce: 'post',
include: path.join(__dirname, '../..', 'src'),
exclude: [/\.(e2e|spec)\.ts$/, /node_modules/, /(ngfactory|ngstyle)\.js/],
},
];You can find the HTML report at coverage/lcov-report/index.html
I have successfully used this mounting approach to test components in other frameworks.
- cypress-vue-unit-test
- cypress-react-unit-test
- cypress-cycle-unit-test
- cypress-svelte-unit-test
- cypress-angular-unit-test
- cypress-hyperapp-unit-test
- cypress-angularjs-unit-test
You can turn on debugging log by setting environment variable :
// Unix
export DEBUG="cypress-angular-unit-test,cypress:webpack:stats"
// PowerShell
$env:DEBUG="cypress-angular-unit-test,cypress:webpack:stats"This project only transpiles the library, to see it in action:
- Install dependencies
npm i - Compile the library
npm run build - Open Cypress with
npx cypress open
Pick any component test spec file to run
![renovate[bot] avatar](https://avatars.githubusercontent.com/in/2740?v=4 "renovate[bot]")
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