void AsReadOnly_works(Instruction[] instructions)
{
var list = new InstructionList(instructions);
Assert.Equal(instructions.Length, list.Count);
Assert.Equal(instructions.Length, list.Capacity);
var roList = list.AsReadOnly();
Assert.IsType <ReadOnlyCollection <Instruction> >(roList);
for (int i = 0; i < list.Count; i++)
{
list[i].Code++;
}
var array = roList.ToArray();
Assert.Equal(list.Count, array.Length);
AssertEqual(list, array);
}