const zone = Zone.current.fork({name: 'testZone'});

     const task = zone.scheduleMacroTask('testPeriodTask', () => {
       zone.cancelTask(task);
     }, {isPeriodic: true}, () => {}, () => {});

    task.invoke();
    expect(task.state).toBe('notScheduled');

    
     const task = zone.scheduleEventTask('testEventTask', () => {
       zone.cancelTask(task);
     }, null, () => {}, () => {});

    task.invoke();
    expect(task.state).toBe('notScheduled');