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describe('Hello world', () => {

    function helloWorld() {
      return 'Hello world!';
    }

    let expected = "";
  
    beforeEach(() => {
      expected = "Hello World";
    });
  
    afterEach(() => {
      expected = "";
    });
  
    it('says hello', () => {
      expect(helloWorld())
          .toEqual("Hello world!");
    });
  });