def test_subtraction_overflow_flag_2(self):
res = util.subtract8_check_overflow(util.make_8bit_twos_comp(-10),
util.make_8bit_twos_comp(10),
self.registers)
self.assertEqual(util.get_8bit_twos_comp(res), -20)
self.assertFalse(self.registers.condition.PV)
self.assertTrue(self.registers.condition.S)
def test_subtraction_overflow_flag_5(self):
res = util.subtract8_check_overflow(util.make_8bit_twos_comp(100), util.make_8bit_twos_comp(-100),
self.registers)
self.assertTrue(self.registers.condition.PV)
def test_subtraction_overflow_flag_3(self):
res = util.subtract8_check_overflow(util.make_8bit_twos_comp(-10), util.make_8bit_twos_comp(-10),
self.registers)
self.assertEqual(util.get_8bit_twos_comp(res), 0)
self.assertFalse(self.registers.condition.PV)
def test_subtraction_overflow_flag_5(self):
res = util.subtract8_check_overflow(util.make_8bit_twos_comp(100),
util.make_8bit_twos_comp(-100),
self.registers)
self.assertTrue(self.registers.condition.PV)