Add support for tests without a callback function

[LandonSchropp]

🚀 Feature Proposal

I'd really like to be able to create tests via it without a callback function. These tests should be automatically marked as skipped.

Motivation

When I'm writing a test suite for a complicated object, I like to be able to write all of the tests I want to cover first, and then go back and implement them one by one. This helps me to think about my module at a high level without getting bogged down in the details.

I run Jest in a tab with the --watch flag turned on. It's really handy to be able to write this out first, and then have Jest ticking down the tests I still need to write. I could add skip calls all over the place, but that slows me down when implementing them.

Example

For example, if I were writing a test file for a safelyParseDate function, I might do something like this:

describe("safelyParseDate", () => {

  describe("when the value is an ISO string", () => {
    it("parses the date");
  });

  describe("when the value is not an ISO string", () => {
    it("returns the string unmodified");
  });

  describe("when the value is undefined", () => {
    it("returns undefined");
  });

  describe("when the value is null", () => {
    it("returns null");
  });

  describe("when the value is already a date", () => {
    it("returns the date");
  });
});

Pitch

This behavior is implemented in Mocha, Rspec and other test runners as well. I think it's a good test workflow, and it encourages developers to be thorough and get all of their test cases written down.

[palmerj3]

@LandonSchropp I would follow #6996 since that covers this use-case exactly.

[SimenB]

Yeah, this will be covered by #6996, see the issues linked in that PR for discussion about it

[LandonSchropp]

Oops, sorry, missed that one. Thanks!

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