Implement hooks

[szk2s]

After BeforeEach, wait a little moment until finishing the initialization.

[szk2s]

describe('hooks', function() {
  before(function() {
    // runs before all tests in this block
  });

  after(function() {
    // runs after all tests in this block
  });

  beforeEach(function() {
    // runs before each test in this block
  });

  afterEach(function() {
    // runs after each test in this block
  });

  // test cases
});

https://mochajs.org/#hooks