public void BranchingMustSetThePCAndAbsAddressRegistersToJumpToRelativeAddressIfTheRequiredFlagIsSet(
string methodName,
NESCpuFlags desiredStatusRegister
)
{
ushort initialProgramCounter = 0x20;
ushort initialRelAddress = 0x40;
ushort expectedAddress = 0x60;
_mockCpu
.SetupProperty(cpu => cpu.StatusRegister, desiredStatusRegister);
_mockCpu
.SetupProperty(cpu => cpu.AbsoluteAddress, (ushort)0x54); // Junk data that will be replaced
_mockCpu
.SetupProperty(cpu => cpu.RelativeAddress, initialRelAddress);
_mockCpu
.SetupProperty(cpu => cpu.ProgramCounter, initialProgramCounter);
var extraCycles = InvokeSubjectMethod(methodName);
Check.That(extraCycles).IsEqualTo(1);
Check.That(_mockCpu.Object.StatusRegister).IsEqualTo(desiredStatusRegister);
Check.That(_mockCpu.Object.AbsoluteAddress).IsEqualTo(expectedAddress);
Check.That(_mockCpu.Object.ProgramCounter).IsEqualTo(expectedAddress);
}
private void SetStatusFlag(NESCpuFlags flag, bool value)
{
if (value)
{
StatusRegister |= flag;
}
else
{
StatusRegister &= ~flag;
}
}
public void BranchingMustSimplyReturnZeroIfTheRequiredFlagIsntSet(
string methodName,
NESCpuFlags desiredStatusRegister
)
{
_mockCpu
.SetupProperty(cpu => cpu.StatusRegister, desiredStatusRegister);
var extraCycles = InvokeSubjectMethod(methodName);
Check.That(extraCycles).IsEqualTo(0);
Check.That(_mockCpu.Object.StatusRegister).IsEqualTo(desiredStatusRegister);
}
public void BranchingMustRequireAnAdditionalCycleIfThereIsAPageJump(
string methodName,
NESCpuFlags desiredStatusRegister
)
{
ushort initialProgramCounter = 0x20;
ushort initialRelAddress = 0x160;
_mockCpu
.SetupProperty(cpu => cpu.StatusRegister, desiredStatusRegister);
_mockCpu
.SetupProperty(cpu => cpu.AbsoluteAddress, (ushort)0x54); // Junk data that will be replaced
_mockCpu
.SetupProperty(cpu => cpu.RelativeAddress, initialRelAddress);
_mockCpu
.SetupProperty(cpu => cpu.ProgramCounter, initialProgramCounter);
var extraCycles = InvokeSubjectMethod(methodName);
Check.That(extraCycles).IsEqualTo(2);
}
