public void Test_removing_at_empty()
{
MyDynamicArray <int> arr = new MyDynamicArray <int>();
// assert
Assert.Throws <ArgumentOutOfRangeException>(() => arr.RemoveAt(0));
}
public void Test_remove_at4()
{
MyDynamicArray <int> arr = new MyDynamicArray <int>();
FillDynamicArray(arr, 1000, 1);
// assert
Assert.Throws <ArgumentOutOfRangeException>(() => arr.RemoveAt(-500));
}