Test environment async setup with transformations

[Vanuan]

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

A feature: asynchronous test setup should apply transformations.

What is the current behavior?

Currently there are the following options to introduce setup code:

• globalSetup
• setupFiles
• setupTestFrameworkScriptFile

Two of those (globalSetup and setupTestFrameworkScriptFile) enable asynchronous setup:

// jest.config.js
module.exports = {
  globalSetup: "<rootDir>/jest.setupGlobal.js",
  setupTestFrameworkScriptFile: "<rootDir>/jest.setupJasmine.js"
};
// jest.setupGlobal.js
module.exports = async function(){
  return app.init();
}

// jest.setupJasmine.js
jasmine.getEnv().topSuite().beforeAll({
        fn: function(done) {
               app.init().then(() => done());
        }
});

Unfortunately, neither of these methods satisfy requirements.

The first method doesn't allow babel transformations. It looks like async code executed in the context of main process, not in the context of worker process.

In the second method it is executed in the context of process, but it's already too late as beforeAll is executed after the test is imported.

What is the expected behavior?

I need a way to execute async setup code before the test module is imported, so that the code in test module is run after my app is initialized. Current globalSetup option doesn't apply transformations.

Please provide your exact Jest configuration and mention your Jest, node,
yarn/npm version and operating system.

Jest 22
Node 8
Yarn 1

[Vanuan]

It looks like the only workaround is to mock/refactor my init function to be synchronous :(
Alternatively, I could enable --harmony_modules so that babel transformations are not needed. But still, it's not clear whether state in globalSetup would somehow impact state inside test.

[Vanuan]

Hm, looks similar to #5164

[thymikee]

Yup, looks like a dupe of #5164. Wanna send a PR with a fix? :)

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