public void TestDecimalAdjustRegister()
{
var device = TestUtils.CreateTestDevice();
var cpu = device.CPU;
var alu = new ALU(cpu);
cpu.Registers.A = 0x45;
cpu.Registers.B = 0x38;
alu.Add(ref cpu.Registers.A, cpu.Registers.B, false);
alu.DecimalAdjustRegister(ref cpu.Registers.A);
Assert.Equal(0x83, cpu.Registers.A);
Assert.Equal(0x0, cpu.Registers.F); // All flags zero
cpu.Registers.A = 0x83;
alu.Sub(ref cpu.Registers.A, cpu.Registers.B, false);
alu.DecimalAdjustRegister(ref cpu.Registers.A);
Assert.Equal(0x45, cpu.Registers.A);
Assert.Equal((byte)CpuFlags.SubtractFlag, cpu.Registers.F); // All flags zero
}