public void AddingTwo16BitRegistersShouldPutTheResultInTheFirstRegister()
{
var machine = new Machine();
machine.Registers.Set(Reg16.HL, 0x1);
machine.Registers.Set(Reg16.BC, 0x2);
machine.ADD(Reg16.HL, Reg16.BC);
Assert.Equal(0x3, machine.Registers.Read(Reg16.HL));
}
public void WhenTheTotalOfTheAdditionIsOutOfRangeTheResultShouldBeReduceBy65536()
{
var machine = new Machine();
machine.Registers.Set(Reg16.HL, 0xAAAA);
machine.Registers.Set(Reg16.BC, 0xBBBB);
machine.ADD(Reg16.HL, Reg16.BC);
Assert.Equal(0x6665, machine.Registers.Read(Reg16.HL));
}
public void AddingTwo16BitRegistersShouldSetTheCarryFlagWhenTheResultIsOutOfRange()
{
var machine = new Machine();
machine.Registers.Set(Reg16.HL, 0xAAAA);
machine.Registers.Set(Reg16.BC, 0xBBBB);
machine.ADD(Reg16.HL, Reg16.BC);
Assert.Equal(true, machine.Flags.Read(Flag.C));
}
public void AnErrorShouldBeThrownIfAnInvalidCombinationOf16BitRegistersAreSupplied(Reg16 register1, Reg16 register2)
{
var machine = new Machine();
var ex = Assert.Throws <InvalidOperationException>(() => machine.ADD(register1, register2));
}