class TestIncrementDecrementOperations(unittest.TestCase):
def setUp(self):
self.memory = Memory(use_bus=False)
self.cpu = CPU(self.memory)
def test_INC(self):
self.memory.write_byte(None, 0x1000, 0x00)
self.cpu.INC(0x1000)
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x01)
self.assertEqual(self.cpu.sign_flag, 0)
self.assertEqual(self.cpu.zero_flag, 0)
self.memory.write_byte(None, 0x1000, 0x7F)
self.cpu.INC(0x1000)
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x80)
self.assertEqual(self.cpu.sign_flag, 1)
self.assertEqual(self.cpu.zero_flag, 0)
self.memory.write_byte(None, 0x1000, 0xFF)
self.cpu.INC(0x1000)
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
self.assertEqual(self.cpu.sign_flag, 0)
self.assertEqual(self.cpu.zero_flag, 1)
def test_INX(self):
self.cpu.x_index = 0x00
self.cpu.INX()
self.assertEqual(self.cpu.x_index, 0x01)
self.assertEqual(self.cpu.sign_flag, 0)
self.assertEqual(self.cpu.zero_flag, 0)
self.cpu.x_index = 0x7F
self.cpu.INX()
self.assertEqual(self.cpu.x_index, 0x80)
self.assertEqual(self.cpu.sign_flag, 1)
self.assertEqual(self.cpu.zero_flag, 0)
self.cpu.x_index = 0xFF
self.cpu.INX()
self.assertEqual(self.cpu.x_index, 0x00)
self.assertEqual(self.cpu.sign_flag, 0)
self.assertEqual(self.cpu.zero_flag, 1)
def test_INY(self):
self.cpu.y_index = 0x00
self.cpu.INY()
self.assertEqual(self.cpu.y_index, 0x01)
self.assertEqual(self.cpu.sign_flag, 0)
self.assertEqual(self.cpu.zero_flag, 0)
self.cpu.y_index = 0x7F
self.cpu.INY()
self.assertEqual(self.cpu.y_index, 0x80)
self.assertEqual(self.cpu.sign_flag, 1)
self.assertEqual(self.cpu.zero_flag, 0)
self.cpu.y_index = 0xFF
self.cpu.INY()
self.assertEqual(self.cpu.y_index, 0x00)
self.assertEqual(self.cpu.sign_flag, 0)
self.assertEqual(self.cpu.zero_flag, 1)
def test_DEC(self):
self.memory.write_byte(None, 0x1000, 0x01)
self.cpu.DEC(0x1000)
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x00)
self.assertEqual(self.cpu.sign_flag, 0)
self.assertEqual(self.cpu.zero_flag, 1)
self.memory.write_byte(None, 0x1000, 0x80)
self.cpu.DEC(0x1000)
self.assertEqual(self.memory.read_byte(None, 0x1000), 0x7F)
self.assertEqual(self.cpu.sign_flag, 0)
self.assertEqual(self.cpu.zero_flag, 0)
self.memory.write_byte(None, 0x1000, 0x00)
self.cpu.DEC(0x1000)
self.assertEqual(self.memory.read_byte(None, 0x1000), 0xFF)
self.assertEqual(self.cpu.sign_flag, 1)
self.assertEqual(self.cpu.zero_flag, 0)
def test_DEX(self):
self.cpu.x_index = 0x01
self.cpu.DEX()
self.assertEqual(self.cpu.x_index, 0x00)
self.assertEqual(self.cpu.sign_flag, 0)
self.assertEqual(self.cpu.zero_flag, 1)
self.cpu.x_index = 0x80
self.cpu.DEX()
self.assertEqual(self.cpu.x_index, 0x7F)
self.assertEqual(self.cpu.sign_flag, 0)
self.assertEqual(self.cpu.zero_flag, 0)
self.cpu.x_index = 0x00
self.cpu.DEX()
self.assertEqual(self.cpu.x_index, 0xFF)
self.assertEqual(self.cpu.sign_flag, 1)
self.assertEqual(self.cpu.zero_flag, 0)
def test_DEY(self):
self.cpu.y_index = 0x01
self.cpu.DEY()
self.assertEqual(self.cpu.y_index, 0x00)
self.assertEqual(self.cpu.sign_flag, 0)
self.assertEqual(self.cpu.zero_flag, 1)
self.cpu.y_index = 0x80
self.cpu.DEY()
self.assertEqual(self.cpu.y_index, 0x7F)
self.assertEqual(self.cpu.sign_flag, 0)
self.assertEqual(self.cpu.zero_flag, 0)
self.cpu.y_index = 0x00
self.cpu.DEY()
self.assertEqual(self.cpu.y_index, 0xFF)
self.assertEqual(self.cpu.sign_flag, 1)
self.assertEqual(self.cpu.zero_flag, 0)