I want to use jest for my server unit testing (instead of mocha+chai).
Is there a way I can run async function before all tests start (init purposes) only once and not for every test file? And also if there’s a way of running something after all tests are done?
Jest provides
beforeAll
andafterAll
. As withtest
/it
it will wait for a promise to resolve, if the function returns a promise.It also supports callback style, if you have some existing test code that uses callbacks, although it’s recommended to use promises.
This feature was added in Jest’s 22 version, with
globalSetup
andglobalTeardown
configurations.Look at this for examples.
package.json (or in jest.config.js)
/scripts/jestGlobalSetup.js
If you execute jest tests with npm you can run any node command or any executable before executing other command
so now you can run this with command
jest provides options for both global setup and teardown in new versions. You can create files for both setup and teardown exporting an async function and provide that path in jest configurarion like this.
You can read about it further here