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# jest-preset-spfx-react16 | ||
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[![npm version](https://badge.fury.io/js/%40voitanos%2Fjest-preset-spfx-react16.png)](https://www.npmjs.com/package/@voitanos/jest-preset-spfx-react16) | ||
[![npm @latest](https://img.shields.io/npm/v/@voitanos/jest-preset-spfx-react16/latest?style=flat-square)](https://www.npmjs.com/package/@voitanos/jest-preset-spfx-react16) [![npm @next](https://img.shields.io/npm/v/@voitanos/jest-preset-spfx-react16/next?style=flat-square)](https://www.npmjs.com/package/@voitanos/jest-preset-spfx-react16) | ||
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[![Voitanos on Twitter](https://img.shields.io/badge/Twitter-%40voitanos-blue?style=flat-square)](https://www.twitterl.com/voitanos) | ||
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A [Jest](http://facebook.github.io/jest) preset configuration for [SharePoint Framework](https://docs.microsoft.com/sharepoint/dev/spfx/sharepoint-framework-overview) (SPFx) projects that leverage React v16. React v16 is used by SPFx projects created with the [SPFx Yeoman generator](https://www.npmjs.com/@microsoft/generator-sharepoint) v1.7.0 or later. It includes the popular [Enzyme](https://airbnb.io/enzyme/) React rendering library from Airbnb | ||
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> See the related packages [jest-preset-spfx](https://www.npmjs.com/package/@voitanos/jest-preset-spfx) for SPFx projects without React & [jest-preset-spfx-react15](https://www.npmjs.com/package/@voitanos/jest-preset-spfx-react15) if you are leveraging React v15. | ||
## Installation | ||
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Install Jest & this preset using your package manager of choice: | ||
1. Install the desired Jest preset using your package manager of choice: | ||
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```shell | ||
npm install jest @voitanos/jest-preset-spfx-react16 --save-dev | ||
``` | ||
```console | ||
npm install jest @voitanos/jest-preset-spfx-react16 --save-dev | ||
``` | ||
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This will install `@types/enzyme-adapter-react-16`, `@types/enzyme-to-json`, `@types/jest`, `@types/react-test-renderer`, `enzyme`, `enzyme-adapter-react-16`, `enzyme-to-json`, `identity-obj-proxy`, `jest-junit`, `raf`, `react-test-renderer` & `ts-jest` as dependencies in your project. The specific versions needed for React v16 are used | ||
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The postinstall script will verify you have a `./config/jest.config.json` file and update your `package.json` scripts with two scripts for running Jest tests with this configuration: `test` & `test:watch`. | ||
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If the configuration file is not present, it will create it. If it is present, it will verify the minimal properties. | ||
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> **IMPORTANT**: Make sure you install the version of the preset that matches the version of TypeScript you're using in your project. See [Installing specific preset versions](#installing-specific-preset-versions) for details on how to determine the correct version. | ||
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> **NOTE**: A specific version of `ts-jest` is used to support the SPFx supported version of TypeScript as more current versions of `ts-jest` require newer versions of TypeScript that is not yet supported by SPFx. | ||
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1. Install the specified version of Jest for your preset version. See [Installing specific preset versions](#installing-specific-preset-versions) for guidance on picking the correct preset version. | ||
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When the you install the preset, it will output to the console the version of Jest you need to install that the installed version of the **ts-jest** transformer uses. Look for the following statement in the console: | ||
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```console | ||
ACTION REQUIRED: Install Jest v25.5.4 by executing the following command in the console: | ||
npm install [email protected] --save-dev --save-exact | ||
``` | ||
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Execute the command displayed in the console to install the required version of Jest in your project. | ||
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### Installing specific preset versions | ||
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Figuring out the correct matrix of package versions to install can be challenging. This mostly comes down to TypeScript. | ||
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SPFx projects are written in TypeScript but Jest defaults to testing JavaScript files. We use the popular [ts-jest](https://www.npmjs.com/package/ts-jest) transformer that converts TypeScript files to JavaScript as Jest executes it's tests. Each version of **ts-jest** is written to match a specific version of TypeScript and Jest. | ||
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But no worries! We've done the hard part of figuring out what combinations of versions you need. | ||
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#### Determine the TypeScript version of your project | ||
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First, determine the version of TypeScript your SPFx project uses: | ||
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This will install `@types/enzyme-adapter-react-16`, `@types/enzyme-to-json`, `@types/jest`, `@types/react-test-renderer`, `enzyme`, `enzyme-adapter-react-16`, `enzyme-to-json`, `identity-obj-proxy`, `raf`, `react-test-renderer` & `ts-jest` | ||
as dependencies in your project. The specific versions needed for React v16 are used | ||
1. Open the **package.json** file in your SPFx project. | ||
1. Within the `devDependencies` object, look for the package that starts with the name `@microsoft/rush-stack-compiler-`. | ||
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The postinstall script will verify you have a `./config/jest.config.json` file and update your `package.json` scripts with two scripts for running Jest tests with this configuration: `test` & `test:watch`. | ||
This package is the bridge to a specific version of TypeScript. The TypeScript version is indicated by the last part of the name of the package. | ||
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If the configuration file is not present, it will create it. If it is present, it will verify the minimal properties. | ||
For example, consider the following entry in the **package.json** file: | ||
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```json | ||
{ | ||
... | ||
"devDependencies": { | ||
"@microsoft/rush-stack-compiler-2.9": "0.6.8", | ||
... | ||
} | ||
} | ||
``` | ||
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This SPFx project is using **TypeScript v2.9**. | ||
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#### Determine the matching Jest preset version | ||
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The next step is to determine the corresponding version of the Jest preset that is configured with the version of TypeScript in your project. | ||
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The Jest preset NPM package contains distribution tags that are used to alias specific published versions of the package. We use them to indicate which version is built for a specific version of TypeScript. | ||
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1. Get a list of all distribution tags by executing the following command: | ||
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```console | ||
npm info @voitanos/jest-preset-spfx-react16 | ||
``` | ||
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1. Locate the matching TypeScript version. The previous command will write the package information to the console as well as a list of the published distribution tags: | ||
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```console | ||
dist-tags: | ||
latest: 1.2.2 next: 1.3.0-beta.b385582 ts2.9: 1.2.2 | ||
``` | ||
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From this output, you can see three tags: | ||
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- **latest**: the most current stable version of the NPM package that's been published | ||
- **next**: the next version of the NPM package, usually a beta and used for testing | ||
- **ts2.9**: the version built for TypeScript v2.9 | ||
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#### Install a specific Jest preset package version | ||
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Using the information above, install the specific Jest preset package: | ||
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```console | ||
npm install @voitanos/[email protected] --save-dev --save-exact | ||
``` | ||
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> **NOTE**: A specific version of `ts-jest` is used to support the SPFx supported version of TypeScript as more current versions of `ts-jest` require newer versions of TypeScript that is not yet supported by SPFx. | ||
> **NOTE**: Pay close attention to the console output as you'll likely have at least one additional step (*look for ACTION REQUIRED*). The console will also contain information about changes applied to your project to support tests. | ||
## Validating Installation | ||
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