public void TestNegativeCases()
{
TagList list = new TagList {
new KeyValuePair <string, object?>("1", 1), new KeyValuePair <string, object?>("2", 2)
};
KeyValuePair <string, object?> kvp = default;
Assert.Throws <ArgumentOutOfRangeException>(() => kvp = list[2]);
Assert.Throws <ArgumentOutOfRangeException>(() => list[2] = kvp);
Assert.Throws <ArgumentOutOfRangeException>(() => kvp = list[-1]);
Assert.Throws <ArgumentOutOfRangeException>(() => list[-2] = kvp);
KeyValuePair <string, object?>[] array = new KeyValuePair <string, object?> [1];
Assert.Throws <ArgumentException>(() => list.CopyTo(array.AsSpan()));
Assert.Throws <ArgumentException>(() => list.CopyTo(array, 0));
Assert.Throws <ArgumentOutOfRangeException>(() => list.CopyTo(array, 1));
Assert.Throws <ArgumentOutOfRangeException>(() => list.CopyTo(array, -1));
Assert.Throws <ArgumentNullException>(() => list.CopyTo(null, 0));
Assert.Throws <ArgumentOutOfRangeException>(() => list.Insert(-1, default));
Assert.Throws <ArgumentOutOfRangeException>(() => list.Insert(3, default));
Assert.Throws <ArgumentOutOfRangeException>(() => list.RemoveAt(-1));
Assert.Throws <ArgumentOutOfRangeException>(() => list.RemoveAt(2));
}
