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Install Jest using
yarn
:- Babbel is the new way to learn a foreign language. The comprehensive learning system combines effective education methods with state-of-the-art technology. Interactive online courses will improve your grammar, vocabulary and pronunciation skills in no time. You'll make fast progress and have fun doing it.
- The Open Babel graphical user interface (GUI) is an alternative to using the command line and has the same capabilities. Since Open Babel 2.3, the GUI is available cross-platform on Windows, Linux and MacOSX. On Windows, you can find it in the Start Menu in the Open Babel folder; on Linux and MacOSX, the GUI can be started with the obgui command.
Or
npm
:Note: Jest documentation uses
yarn
commands, but npm
will also work. You can compare yarn
and npm
commands in the yarn docs, here.Let's get started by writing a test for a hypothetical function that adds two numbers. First, create a
sum.js
file:Then, create a file named
sum.test.js
. This will contain our actual test:Add the following section to your
package.json
:Finally, run
yarn test
or npm run test
and Jest will print this message:You just successfully wrote your first test using Jest!
This test used
expect
and toBe
to test that two values were exactly identical. To learn about the other things that Jest can test, see Using Matchers.Running from command line
You can run Jest directly from the CLI (if it's globally available in your
PATH
, e.g. by yarn global add jest
or npm install jest --global
) with a variety of useful options.Here's how to run Jest on files matching
my-test
, using config.json
as a configuration file and display a native OS notification after the run:![Babel: Choice 1 0 Babel: Choice 1 0](https://image.winudf.com/v2/image/Y29tLmJ1bGt5cGl4LmJhYmVsMmZyZWVtaXVtX3NjcmVlbnNob3RzXzBfYTU1MWE1YTc/screen-0.jpg?fakeurl=1&type=.jpg)
If you'd like to learn more about running
jest
through the command line, take a look at the Jest CLI Options page.Additional Configuration
Generate a basic configuration file
Based on your project, Jest will ask you a few questions and will create a basic configuration file with a short description for each option:
Using Babel
To use Babel, install required dependencies via
yarn
:Audiobook builder 2 1 games. Configure Babel to target your current version of Node by creating a
babel.config.js
file in the root of your project:The ideal configuration for Babel will depend on your project. See Babel's docs for more details.
![Choice Choice](https://steamcdn-a.akamaihd.net/steam/apps/430170/ss_706f50a10c63d690cff32da550d441cd035bfa0c.1920x1080.jpg)
Jest will set
process.env.NODE_ENV
to 'test'
if it's not set to something else. You can use that in your configuration to conditionally setup only the compilation needed for Jest, e.g.Babel: Choice 1 0 Percent
Note:
babel-jest
is automatically installed when installing Jest and will automatically transform files if a babel configuration exists in your project. To avoid this behavior, you can explicitly reset the transform
configuration option:Jest 24 dropped support for Babel 6. We highly recommend you to upgrade to Babel 7, which is actively maintained. However, if you cannot upgrade to Babel 7, either keep using Jest 23 or upgrade to Jest 24 with
babel-jest
locked at version 23, like in the example below:While we generally recommend using the same version of every Jest package, this workaround will allow you to continue using the latest version of Jest with Babel 6 for now.
Using webpack
Jest can be used in projects that use webpack to manage assets, styles, and compilation. webpack does offer some unique challenges over other tools. Refer to the webpack guide to get started.
Using parcel
Babel: Choice 1 0 4
Jest can be used in projects that use parcel-bundler to manage assets, styles, and compilation similar to webpack. Parcel requires zero configuration. Refer to the official docs to get started.
Using TypeScript
Jest supports TypeScript, via Babel. First, make sure you followed the instructions on using Babel above. Next, install the
@babel/preset-typescript
via yarn
:Then add
@babel/preset-typescript
to the list of presets in your babel.config.js
. Quick n easy web builder 3 1 4.However, there are some caveats to using TypeScript with Babel. Because TypeScript support in Babel is transpilation, Jest will not type-check your tests as they are run. If you want that, you can use ts-jest.