void RemoveAt_works()
{
var instructions = GetInstructions();
var list = new InstructionList(instructions);
Assert.Equal(instructions.Length, list.Count);
Assert.Equal(instructions.Length, list.Capacity);
list.RemoveAt(0);
Assert.Equal(instructions.Length - 1, list.Count);
Assert.Equal(instructions.Length, list.Capacity);
list.RemoveAt(list.Count - 1);
Assert.Equal(instructions.Length - 2, list.Count);
Assert.Equal(instructions.Length, list.Capacity);
list.RemoveAt(4);
Assert.Equal(instructions.Length - 3, list.Count);
Assert.Equal(instructions.Length, list.Capacity);
var expected = new Instruction[instructions.Length - 3];
for (int i = 0, j = 0; i < instructions.Length; i++)
{
if (i == 0 || i == instructions.Length - 1 || i == 4 + 1)
{
continue;
}
expected[j++] = instructions[i];
}
var listElems = new Instruction[list.Count];
list.CopyTo(listElems);
AssertEqual(expected, listElems);
}
void RemoveAt_throws_if_invalid_input()
{
var instructions = GetInstructions();
InstructionList list;
list = new InstructionList();
Assert.Throws <ArgumentOutOfRangeException>(() => list.RemoveAt(GetValue(-1)));
Assert.Throws <ArgumentOutOfRangeException>(() => list.RemoveAt(GetValue(0)));
list = new InstructionList(instructions);
Assert.Throws <ArgumentOutOfRangeException>(() => list.RemoveAt(GetValue(-1)));
Assert.Throws <ArgumentOutOfRangeException>(() => list.RemoveAt(GetValue(int.MinValue)));
Assert.Throws <ArgumentOutOfRangeException>(() => list.RemoveAt(GetValue(int.MaxValue)));
Assert.Throws <ArgumentOutOfRangeException>(() => list.RemoveAt(GetValue(list.Count)));
}