public void ClockDataCollectionTest_Equals()
        {
            // Arrange
            var f = new MainForm();

            var td1 = new TimerData(f.MyDataFile, f.MultiAudioPlayer)
            {
                Tag             = "t1",
                GroupName       = "test",
                CurrentTimeSpan = TimeSpan.FromMinutes(60)
            };

            var td2 = new TimerData(f.MyDataFile, f.MultiAudioPlayer)
            {
                Tag             = "t2",
                CurrentTimeSpan = TimeSpan.FromMinutes(50)
            };

            var td3 = new TimerData(f.MyDataFile, f.MultiAudioPlayer)
            {
                Tag             = "t3",
                CurrentTimeSpan = TimeSpan.FromMinutes(20)
            };

            var ad4 = new AlarmData(f.MyDataFile, f.MultiAudioPlayer)
            {
                Tag             = "a4",
                CurrentDateTime = DateTime.Now + TimeSpan.FromMinutes(40)
            };

            var ad5 = new AlarmData(f.MyDataFile, f.MultiAudioPlayer)
            {
                Tag             = "a5",
                CurrentDateTime = DateTime.Now + TimeSpan.FromMinutes(1000)
            };

            // Act
            f.MyDataFile.ClockMCollection.IsUnsavedLocked = true;
            f.MyDataFile.ClockMCollection.AddClocks(td1, td2, td3, ad4, ad5);
            f.MyDataFile.ClockMCollection.IsUnsavedLocked = false;

            var cc = new ClockMCollection(f.MyDataFile);

            cc.Groups = f.MyDataFile.ClockMCollection.Groups;
            cc.AddClocks(td1, td2, td3, ad4, ad5);

            Assert.AreEqual(f.MyDataFile.ClockMCollection, cc);

            cc.RemoveAllClocks();
            cc.Groups = f.MyDataFile.ClockMCollection.Groups;
            cc.AddClocks(td2, td1, td3, ad4, ad5);

            Assert.AreNotEqual(f.MyDataFile.ClockMCollection, cc);
        }