Jest: Global beforeAll / Execute some code only once before ALL test files

[Deilan]

Do you want to request a feature or report a bug?
feature

What is the current behavior?
Unable to execute some code only once before all test files, e. g. create a database, promisify functions, import reflect-metadata, etc.

What is the expected behavior?
Able to execute some before all test files.

[cpojer]

beforeEach or using your own custom test environment will work. There is a PR to make that async, #4506.

[idangozlan]

@cpojer I can't find out how your response related to the issue.

@Deilan , I'm experiencing the same thing, is there any solution run beforeAll that runs only once even if im using multiple test files?

[SimenB]

We have globalSetup these days: https://facebook.github.io/jest/docs/en/configuration.html#globalsetup-string

[voroshkov]

@SimenB is there an example of how globalSetup can be used?

[thymikee]

@voroshkov see https://jestjs.io/docs/en/puppeteer

[voroshkov]

@thymikee, thanks! Is there a way I can use ES6 imports in the globalSetup script or in scripts it requires?

[thymikee]

Nope, only with babel-register if you fancy