Test shared expect calls across the test suite with jest

jest-group-expects-reuse.spec.ts

const testGroupOfExpects = target => {
  expect(!!target).toBe(true);
  expect(target).toContain(1);
};

describe('grouping', () => {
  it('should do smth', () => {
    const target = [1, 2];

    testGroupOfExpects(target);
  });

  it('should do the same plus', () => {
    const target = [1, 2, { some: 'prop' }];

    testGroupOfExpects(target);
    expect(target[2]).toMatchObject({ some: 'prop' });
  });
});