fragment.spec.ts

// ...
    describe('On toggle checkbox clicked', () => {
      describe('when it is initially active', () => {
        beforeEach(() => {
          view.todo = activeTodo;
          presenter.attach(view);
          jest.clearAllMocks();
        });

        test('completes the todo', () => {
          presenter.toggleTodo();

          expect(todosState.state[0].isCompleted).toBe(true);
        });

        test('checks the checkbox', () => {
          presenter.toggleTodo();

          expect(view.completeTodo).toHaveBeenCalled();
        });
      });
    });
// ...