public void Test_POP(byte opcode)
{
ushort sp = 0x4242;
byte lsbData = 0xFF;
byte msbData = 0x11;
var expectedState = new CpuState();
expectedState.StackPointer = (ushort)(sp + 2);
switch (opcode)
{
case 0xC1:
expectedState.Registers.BC = (ushort)((msbData << 8) | lsbData);
break;
case 0xD1:
expectedState.Registers.DE = (ushort)((msbData << 8) | lsbData);
break;
case 0xE1:
expectedState.Registers.HL = (ushort)((msbData << 8) | lsbData);
break;
case 0xF1:
expectedState.Registers.F = lsbData;
expectedState.Registers.A = msbData;
break;
}
var actualState = new CpuState();
actualState.StackPointer = sp;
var memoryMock = new Mock <IRandomAccessMemory>();
memoryMock.Setup(m => m.ReadByte(sp)).Returns(lsbData);
memoryMock.Setup(m => m.ReadByte((ushort)(sp + 1))).Returns(msbData);
var instruction = new POP();
instruction.Initialize(opcode);
//act
while (!instruction.IsFetchNecessary())
{
instruction.ExecuteCycle(actualState, memoryMock.Object);
}
//assert
TestHelper.AssertCpuState(expectedState, actualState);
memoryMock.Verify(m => m.WriteByte(It.IsAny <ushort>(), It.IsAny <byte>()), Times.Never);
}