Setup And Teardown

Often while writing tests you have some setup work that needs to happen before tests run, and you have some finishing work that needs to happen after tests run. unittest framework provides helper functions to handle this.

If you have some work you need to do repeatedly for many tests, you can use beforeEach and afterEach hooks.

INFO

beforeEach and afterEach can only work inside describe which will limit its scope

How to Use

let setup = 0;
describe("setup", () => {
  // effect for the whole describe including sub-describe
  beforeEach(() => {
    setup = 10;
  });
  test("1st", () => {
    expect(setup).equal(10);
    setup = 100;
  });
  test("2nd", () => {
    expect(setup).equal(10);
    setup = 100;
  });
  test("3nd", () => {
    expect(setup).equal(10);
  });
});

INFO

If multiple beforeEach or afterEach is registered, they will be call in order.