public void WriteToMemory_OutsideValidMemoryRange_ThrowsException(ushort instructionCode, ushort initialI)
{
var cpu = new Cpu {
I = initialI
};
var decodedInstruction = new DecodedInstruction(instructionCode);
var instruction = new Instruction_Fx55(decodedInstruction);
Assert.Throws <InvalidOperationException>(() => instruction.Execute(cpu, MockedDisplay, MockedKeyboard));
}
public void Executing_Instruction_Fx55_WorksAsExpected(ushort instructionCode, ushort initialI)
{
var cpu = new Cpu();
var decodedInstruction = new DecodedInstruction(instructionCode);
cpu.I = initialI;
for (byte i = 0; i <= 0xF; i++)
{
cpu.V[i] = i;
}
var instruction = new Instruction_Fx55(decodedInstruction);
instruction.Execute(cpu, MockedDisplay, MockedKeyboard);
Assert.That(cpu.I, Is.EqualTo(initialI + decodedInstruction.x + 1));
for (byte i = 0; i <= 0xF; i++)
{
var expectedValue = (i <= decodedInstruction.x) ? i : (byte)0;
Assert.That(cpu.Memory[i + initialI], Is.EqualTo(expectedValue));
}
Assert.That(instruction.Mnemonic, Is.EqualTo($"LD [I], V{decodedInstruction.x:X}"));
}