16_collection = new(_comboBoxCell);

22_collection.Count.Should().Be(0); 24int index1 = _collection.Add("Item1"); 25int index2 = _collection.Add("Item2"); 26_collection.Count.Should().Be(2); 30_collection.Remove("Item1"); 31_collection.Count.Should().Be(1); 32_collection[0].Should().Be("Item2"); 34_collection.Add("Item1"); 35_collection.Remove("Item2"); 36_collection.Count.Should().Be(1); 37_collection[0].Should().Be("Item1"); 39_collection.Clear(); 40_collection.Count.Should().Be(0); 45_collection.IsReadOnly.Should().BeFalse(); 54_collection.Add(item1); 55int index = _collection.Add(item2); 58_collection.Count.Should().Be(2); 59_collection[0].Should().Be(item2); 60_collection[1].Should().Be(item1); 66Action action = () => _collection.Add(null!); 76_collection.AddRange(items); 78_collection.Count.Should().Be(3); 79_collection[0].Should().Be("Item1"); 80_collection[1].Should().Be("Item2"); 81_collection[2].Should().Be("Item3"); 90_collection.AddRange(items); 92_collection.Count.Should().Be(3); 93_collection[0].Should().Be("A"); 94_collection[1].Should().Be("B"); 95_collection[2].Should().Be("C"); 103_collection.AddRange(items); 105_collection.InnerArray.Count.Should().Be(3); 106_collection[0].Should().Be("Item1"); 107_collection[1].Should().Be("Item2"); 108_collection[2].Should().Be("Item3"); 116Action action = () => _collection.AddRange(items); 119_collection.Count.Should().Be(0); 127_collection.Add(item1); 128_collection.Add(item2); 130_collection[0].Should().Be(item1); 131_collection[1].Should().Be(item2); 139_collection.Add(item1); 141_collection[0] = item2; 143_collection[0].Should().Be(item2); 151Action action = () => _collection[index] = "Item"; 159_collection.Add("Item"); 161Action action = () => _collection[0] = null!; 171_collection.Add("Item1"); 172_collection.Add("Item2"); 174_collection.Clear(); 176_collection.Count.Should().Be(0); 185_collection.Add(item); 187_collection.Contains(item).Should().BeTrue(); 188_collection.Contains("NonExistentItem").Should().BeFalse(); 194Action action = () => _collection.Contains(null!); 203_collection.AddRange(items); 206_collection.CopyTo(destination, 0); 216Action actionNullDestination = () => _collection.CopyTo(null!, 0); 220Action actionNegativeIndex = () => _collection.CopyTo(destination, -1); 223Action actionOutOfRangeIndex = () => _collection.CopyTo(destination, 4); 231_collection.AddRange(items); 234Action action = () => _collection.CopyTo(destination, 0); 243_collection.AddRange(items); 245var enumerator = _collection.GetEnumerator(); 262_collection.Add(item1); 263_collection.Add(item2); 265_collection.IndexOf(item1).Should().Be(0); 266_collection.IndexOf(item2).Should().Be(1); 267_collection.IndexOf("NonExistentItem").Should().Be(-1); 273Action action = () => _collection.IndexOf(null!); 284_collection.Add(item1); 285_collection.Insert(0, item2); 289_collection[0].Should().Be(item2); 290_collection[1].Should().Be(item1); 294_collection[0].Should().Be(item2); 295_collection[1].Should().Be(item1); 305Action actionNegativeIndex = () => _collection.Insert(-1, "Item"); 306Action actionOutOfRangeIndex = () => _collection.Insert(1, "Item"); 307Action actionNullItem = () => _collection.Insert(0, null!); 319_collection.Add(item1); 321_collection.Remove(item2); 323_collection.Count.Should().Be(1); 324_collection[0].Should().Be(item1); 332_collection.Add(item1); 333_collection.Add(item2); 335_collection.RemoveAt(0); 337_collection.Count.Should().Be(1); 338_collection[0].Should().Be(item2); 346Action action = () => _collection.RemoveAt(index);