Consider adding eslint-plugin-jest-formatting

[manovotny]

It was discovered that the following code does not produce a lint error.

describe('something', () => {
    beforeEach(() => {
        // TODO
    });
    test('should test something', () => {
        expect(true).toBe(false);
    });
});

It is desired to have a blank line between the beforeEach and test blocks.

I first went down the route of debugging padding-line-between-statements thinking that I configured multiline-block-like incorrectly, but that wasn't it. Turns out, multiline-expression causes it to fire an error correctly, but forces us to put blank links after a slew of other things we don't want to care about too.

That lead to some googling and discovery of jest-community/eslint-plugin-jest#17, which ultimately led to the promise land of https://github.com/dangreenisrael/eslint-plugin-jest-formatting.

We should look to incorporate that here.

[manovotny]

This will be fixed in the v7 release.