Add skip and only for tests

[Latropos]

Summary

Implement skip and only for tests.
Especially only is important when creating new tests, since you generally want to add a decorator to your test instead of commenting out most of the file to run only one test.

• only - if only decorator is used in any testfile, then only the decorater tests and suites will be executed
  • describe.only
  • test.only
  • test.only.each
• skip - skip decorated tests and suites
  • describe.skip
  • test.skip
  • test.skip.each

Additionally the number of the skipped tests will be displayed.

Test plan

Testing code

describe('Big wardrobe', () => {
  test('Test of wardrobe', async () => {
    await render(<View />);
    expect(1).toBe(1);
  });

  describe('Shelf 1', () => {
    test('Test of Shelf 1', async () => {
      await render(<View />);
      expect(1).toBe(1);
    });
    describe('Box 1 on Shelf 1', () => {
      describe('Book 1 in the Box 1 on Shelf 1', () => {
        test('Test of Book 1 in the Box 1  on Shelf 1', async () => {
          await render(<View />);
          expect(1).toBe(1);
        });
      });
      describe('Book 2 in the Box 1 on Shelf 1', () => {
        test('Test of Book 2 in the Box 1  on Shelf 1', async () => {
          await render(<View />);
          expect(1).toBe(1);
        });
      });
    });
  });
  describe('Shelf 2', () => {
    test('Test of Shelf 2', async () => {
      await render(<View />);
      expect(1).toBe(1);
    });
  });
  describe('Shelf 3', () => {
    test('Test of Shelf 3', async () => {
      await render(<View />);
      expect(1).toBe(1);
    });
    describe('Box 1 on Shelf 3', () => {
      describe('Book 1 in the Box 1 on Shelf 3', () => {
        test('Test of Book 1 in the Box 1  on Shelf 3', async () => {
          await render(<View />);
          expect(1).toBe(1);
        });

        test.each(['Page1', 'Page2', 'Page3'])('Test of %p in Box 1 on Shelf 3', async () => {
          await render(<View />);
          expect(1).toBe(1);
        });
      });
      describe('Book 2 in the Box 1 on Shelf 3', () => {
        test('Test of Book 2 in the Box 1  on Shelf 3', async () => {
          await render(<View />);
          expect(1).toBe(1);
        });
      });
    });
  });
});