public void SUB_nTest() { PrivateObject z = new PrivateObject(new Z80(new Memory48K())); Z80_Accessor target = new Z80_Accessor(z); target.A = 123; target.Memory[0x5000] = 11; target.PC = 0x5000; target.SUB_n(); Assert.IsTrue(target.A == 112, "Error: SUB n"); }