[testing/bdd] async `describe`

[teidesu]

Is your feature request related to a problem? Please describe.

in vitest we can use async functions as a callback to describe(), which allows setting up group-related resource, e.g.:

describe('foo', async () => {
  const foo = await createFoo()
  afterAll(() => foo.destroy())
  
  // ... tests ...
})

however describe currently doesn't allow async functions to be passed

Describe the solution you'd like

support async describe callbacks

Describe alternatives you've considered

• move all awaits to top level - the downside is that group-related stuff stops being grouped
• initialize everything with a beforeAll hook - the downside is that we have to use non-null assertions for typescript + increases boilerplate

[ctsstc]

Would love to see this. Coming from the Jest ecosystem this was fairly standard for setting up our BDD test suite ie:

describe('route and middleware initialization', () => {
  describe('GET /', async () => {
    const response = await mainApp.request('/');

    it('has an OK status', () => {
      expect(response.status).toEqual(200);
    });
  });
});

Right now we're stuck with asserting the value exists (would be nice if TS had a "late" keyword like Dart for such), or doing some janky await unwrapping. Either way feels mucky and not so great unfortunately.