More granular reporter API

[palmerj3]

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

Feature

What is the current behavior?

A jest reporter can register 5 callbacks right now:
onRunStart - when the runner is first initiated
onTestStart - when a suite is first run
onTestResult - when a suite has completed
onRunComplete - when the runner has completed
getLastError

What is the expected behavior?

I would like some more granularity for the reporter API.
Specifically I would like callbacks for when an individual test is run and complete.

The jasmine API has specStarted and specDone for this purpose.
But right now the jest reporter API doesn't seem to provide the ability to have a callback before and after a given test is run - only callbacks for when the parent suite is run.

For example with the following test.spec.js file onTestStart is only called once even though there are two tests:

describe('describe block', () => {
  it('should pass', () => {
    expect(true).toEqual(true);
  });

  it('should fail', () => {
    expect(true).toEqual(false);
  });
})

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

Jest: 21.1.0
OS: Mac OSX 10.12.6
Yarn: 0.27.5

[cpojer]

@aaronabramov is working on it. #4471 etc. Please ask him there.

[github-actions]

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