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127 changes: 127 additions & 0 deletions
127
website/versioned_docs/version-14.0/getting-started/installation.md
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--- | ||
id: installation | ||
title: Installation | ||
--- | ||
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### Dependencies | ||
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You can install `jest-preset-angular` and dependencies all at once with one of the following commands. | ||
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```bash npm2yarn | ||
npm install -D jest jest-preset-angular @types/jest | ||
``` | ||
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### Configuration | ||
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:::important | ||
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Angular doesn't support native `async/await` in testing with `target` higher than `ES2016`, see https://github.com/angular/components/issues/21632#issuecomment-764975917 | ||
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::: | ||
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In your project root, create `setup-jest.ts` file with following contents: | ||
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```ts | ||
import 'jest-preset-angular/setup-jest'; | ||
``` | ||
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Add the following section: | ||
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- to your root Jest config | ||
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```js tab | ||
// jest.config.js | ||
module.exports = { | ||
preset: 'jest-preset-angular', | ||
setupFilesAfterEnv: ['<rootDir>/setup-jest.ts'], | ||
}; | ||
``` | ||
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```ts tab | ||
// jest.config.ts | ||
import type { Config } from 'jest'; | ||
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const jestConfig: Config = { | ||
preset: 'jest-preset-angular', | ||
setupFilesAfterEnv: ['<rootDir>/setup-jest.ts'], | ||
}; | ||
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export default jestConfig; | ||
``` | ||
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Adjust your `tsconfig.spec.json` to be: | ||
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```json | ||
{ | ||
"extends": "./tsconfig.json", | ||
"compilerOptions": { | ||
"outDir": "./out-tsc/spec", | ||
"module": "CommonJs", | ||
"types": ["jest"] | ||
}, | ||
"include": ["src/**/*.spec.ts", "src/**/*.d.ts"] | ||
} | ||
``` | ||
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Adjust `scripts` part your `package.json` to use `jest` instead of `ng`, e.g. | ||
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```json | ||
{ | ||
"scripts": { | ||
"test": "jest", | ||
"test:watch": "jest --watch" | ||
} | ||
} | ||
``` | ||
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### Customizing | ||
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#### Global mocks | ||
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`jest-preset-angular` uses `JSDOM` which is different from normal browsers. You might need some global browser mocks to | ||
simulate the behaviors of real browsers in `JSDOM`. To add global mocks, you can do the following: | ||
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- Create a file `jest-global-mocks.ts` to your root project. | ||
- Import it in your global setup file: | ||
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```ts | ||
// Assuming that your global setup file is setup-jest.ts | ||
import 'jest-preset-angular/setup-jest'; | ||
import './jest-global-mocks'; | ||
``` | ||
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:::tip | ||
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An example for `jest-global-mocks.ts` | ||
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``` | ||
Object.defineProperty(document, 'doctype', { | ||
value: '<!DOCTYPE html>', | ||
}); | ||
Object.defineProperty(window, 'getComputedStyle', { | ||
value: () => { | ||
return { | ||
display: 'none', | ||
appearance: ['-webkit-appearance'], | ||
}; | ||
}, | ||
}); | ||
/** | ||
* ISSUE: https://github.com/angular/material2/issues/7101 | ||
* Workaround for JSDOM missing transform property | ||
*/ | ||
Object.defineProperty(document.body.style, 'transform', { | ||
value: () => { | ||
return { | ||
enumerable: true, | ||
configurable: true, | ||
}; | ||
}, | ||
}); | ||
``` | ||
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::: | ||
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#### Avoid karma conflicts | ||
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By Angular CLI defaults you'll have a `src/test.ts` file which will be picked up by jest. To circumvent this you can either rename it to `src/karmaTest.ts` or hide it from jest by adding `<rootDir>/src/test.ts` to jest `testPathIgnorePatterns` option. |
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website/versioned_docs/version-14.0/getting-started/options.md
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--- | ||
id: options | ||
title: Options | ||
--- | ||
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`jest-preset-angular` uses `ts-jest` options under the hood, which are located under the `transform` of Jest config object | ||
in the `package.json` file of your project, or through a `jest.config.js`, or `jest.config.ts` file. | ||
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More information about `ts-jest` options, see [doc](https://kulshekhar.github.io/ts-jest/docs/getting-started/options) | ||
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:::important | ||
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Since **v9.0.0**, `jest-preset-angular` default Jest configuration no longer provides `moduleNameMapper`. If you wish to reuse | ||
the old `moduleNameMapper` configuration, you can put this into your Jest config. | ||
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```js tab | ||
// jest.config.js | ||
module.exports = { | ||
//... | ||
moduleNameMapper: { | ||
'^src/(.*)$': '<rootDir>/src/$1', | ||
'^app/(.*)$': '<rootDir>/src/app/$1', | ||
'^assets/(.*)$': '<rootDir>/src/assets/$1', | ||
'^environments/(.*)$': '<rootDir>/src/environments/$1', | ||
}, | ||
}; | ||
``` | ||
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```ts tab | ||
// jest.config.ts | ||
import type { Config } from 'jest'; | ||
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const jestConfig: Config = { | ||
//... | ||
moduleNameMapper: { | ||
'^src/(.*)$': '<rootDir>/src/$1', | ||
'^app/(.*)$': '<rootDir>/src/app/$1', | ||
'^assets/(.*)$': '<rootDir>/src/assets/$1', | ||
'^environments/(.*)$': '<rootDir>/src/environments/$1', | ||
}, | ||
}; | ||
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export default jestConfig; | ||
``` | ||
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### Processing with esbuild | ||
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Since **v11.0.0**, `jest-preset-angular` introduced the usage of `esbuild` to process files besides TypeScript API. By default, all `.mjs` files | ||
will be processed by `esbuild` in `jest-preset-angular`. To configure extra files to process with `esbuild`, one can do the following: | ||
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```js tab | ||
// jest.config.js | ||
module.exports = { | ||
//... | ||
globals: { | ||
ngJest: { | ||
processWithEsbuild: [<glob_to_files>], | ||
}, | ||
}, | ||
} | ||
``` | ||
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```ts tab | ||
// jest.config.ts | ||
import type { Config } from 'jest'; | ||
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const jestConfig: Config = { | ||
//... | ||
globals: { | ||
ngJest: { | ||
processWithEsbuild: [<glob_to_files>], | ||
}, | ||
}, | ||
} | ||
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export default jestConfig; | ||
``` | ||
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::: | ||
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### Exposed configuration | ||
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```js tab | ||
// jest.config.js | ||
const snapshotSerializers = require('jest-preset-angular/build/serializers'); | ||
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module.exports = { | ||
moduleFileExtensions: ['ts', 'html', 'js', 'json', 'mjs'], | ||
resolver: 'jest-preset-angular/build/resolvers/ng-jest-resolver.js', | ||
snapshotSerializers, | ||
testEnvironment: 'jsdom', | ||
transformIgnorePatterns: ['node_modules/(?!.*\\.mjs$)'], | ||
transform: { | ||
'^.+\\.(ts|js|mjs|html|svg)$': [ | ||
'jest-preset-angular', | ||
{ | ||
tsconfig: '<rootDir>/tsconfig.spec.json', | ||
stringifyContentPathRegex: '\\.(html|svg)$', | ||
}, | ||
], | ||
}, | ||
}; | ||
``` | ||
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```ts tab | ||
// jest.config.ts | ||
import type { Config } from 'jest'; | ||
import snapshotSerializers from 'jest-preset-angular/build/serializers'; | ||
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const jestConfig: Config = { | ||
moduleFileExtensions: ['ts', 'html', 'js', 'json', 'mjs'], | ||
resolver: 'jest-preset-angular/build/resolvers/ng-jest-resolver.js', | ||
snapshotSerializers, | ||
testEnvironment: 'jsdom', | ||
transformIgnorePatterns: ['node_modules/(?!.*\\.mjs$)'], | ||
transform: { | ||
'^.+\\.(ts|js|mjs|html|svg)$': [ | ||
'jest-preset-angular', | ||
{ | ||
tsconfig: '<rootDir>/tsconfig.spec.json', | ||
stringifyContentPathRegex: '\\.(html|svg)$', | ||
}, | ||
], | ||
}, | ||
}; | ||
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export default jestConfig; | ||
``` | ||
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:::important | ||
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Jest runs with `jest-preset-angular` neither in browser nor through dev server. It uses `JSDOM` to abstract browser environment hence we depend on | ||
`JSDOM` implementation for real browser features. | ||
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::: | ||
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### Brief explanation of config | ||
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- We're using `"transform"` to pass information about configuration to use for code compilation with `ts-jest`. | ||
- `"moduleFileExtensions"` – our modules are TypeScript (`ts`), HTML (`html`), JavaScript (`js`), JSON (`json`) and ESM JavaScript (`mjs`) files. | ||
- `"moduleNameMapper"` – if you're using absolute imports here's how to tell Jest where to look for them; uses `RegExp`. | ||
- `"resolver"` - instruct Jest how to resolve entry file based on `package.json` definitions. | ||
- `"snapshotSerializers"` - array of serializers which will be applied to snapshot the code. Note: by default angular adds | ||
some angular-specific attributes to the code (like `ng-reflect-*`, `ng-version="*"`, `_ngcontent-c*` etc). | ||
This package provides serializer to remove such attributes. This makes snapshots cleaner and more human-readable. | ||
To remove such specific attributes use `no-ng-attributes` serializer. You need to add `no-ng-attributes` serializer manually. | ||
- `"testEnvironment"` – the test environment to run on. | ||
- `"transformIgnorePatterns"`: instruct Jest to transform any `.mjs` files which come from `node_modules`. | ||
- `"transform"` – run every `TS`, `JS`, `MJS`, `HTML`, or `SVG` file through so called _Jest transformer_; this lets Jest understand non-JS syntax. |
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