What is Setup and Teardown in Jasmine?

Sometimes in order to test a feature we need to perform some setup, perhaps it's creating some test objects. Also, we may need to perform some cleanup activities after we have finished testing, perhaps we need to delete some files from the hard drive.

These activities are called setup and teardown (for cleaning up) and Jasmine has a few functions we can use to make this easier:

beforeAll function is called once, before all the specs in a test suite (describe function) are run.

afterAll function is called once after all the specs in a test suite are finished.

beforeEach function is called before each test specification (it function) is run.

afterEach function is called after each test specification is run.

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

  let expected = "";

  beforeEach(() => {
    expected = "Hello World";
  });

  afterEach(() => {
    expected = "";
  });

  it('says hello', () => {
    expect(helloWorld())
        .toEqual(expected);
  });
});

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