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emu8086_test.py
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emu8086_test.py
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import unittest
import emu8086
class TestCarryFlagByte(unittest.TestCase):
def setUp(self):
self.flags = emu8086.Flags()
def test_initial(self):
self.assertFalse(self.flags.cf())
def test_when_neg_result_sub(self):
"""
2 - 5
0000 0010
- 0000 0101
<=> 0000 0010
+11111 1011
---------------
11111 1101
= 509
"""
self.flags.set_from_sub_operands(2, 5, False)
self.assertEquals(self.flags.cf(), 1)
def test_when_pos_result_sub_2comp(self):
self.flags.set_from_sub_operands(2, 1, False)
self.assertEquals(self.flags.cf(), 0)
def test_when_pos_result(self):
self.flags.set_from_add_result(0b01111111, False)
self.assertEquals(self.flags.cf(), 0)
def test_when_zero_result_sub_2comp(self):
self.flags.set_from_add_result(emu8086.sub_2compl(1, 1, False), False)
self.assertEquals(self.flags.cf(), 1)
def test_when_zero_result(self):
self.flags.set_from_add_result(0, False)
self.assertEquals(self.flags.cf(), 0)
class TestSignFlagWord(unittest.TestCase):
def setUp(self):
self.flags = emu8086.Flags()
def test_initial_signflag(self):
self.assertEquals(self.flags.sf(), 0)
def test_when_neg_result(self):
self.flags.set_from_sub_operands(0, 1, True)
self.assertEquals(self.flags.sf(), 1)
def test_when_pos_result(self):
self.flags.set_from_add_result(0xf000, True)
self.assertEquals(self.flags.sf(), 1)
class TestSignFlagByte(unittest.TestCase):
def setUp(self):
self.flags = emu8086.Flags()
def test_initial(self):
self.assertEquals(self.flags.sf(), 0)
def test_when_neg_result(self):
self.flags.set_from_sub_operands(0, 1, False)
self.assertEquals(self.flags.sf(), 1)
def test_when_pos_result(self):
self.flags.set_from_add_result(0xf0, False)
self.assertTrue(self.flags.sf())
class TestZeroFlag(unittest.TestCase):
def setUp(self):
self.flags = emu8086.Flags()
def test_initial(self):
self.assertFalse(self.flags.zf())
def test_when_neg_result(self):
self.flags.set_from_sub_operands(0, 1, False)
self.assertFalse(self.flags.zf())
def test_when_eq_result(self):
self.flags.set_from_add_result(0, False)
self.assertTrue(self.flags.zf())
def test_when_pos_result(self):
self.flags.set_from_add_result(0xf0, False)
self.assertFalse(self.flags.zf())
class TestHelpers(unittest.TestCase):
def test_sgn_ext(self):
self.assertEqual(emu8086.sgn_ext(0), 0)
self.assertEqual(emu8086.sgn_ext(0b01111111), 0b01111111)
self.assertEqual(emu8086.sgn_ext(0b10000000), 0b1111111110000000)
self.assertEqual(emu8086.sgn_ext(0b10101011), 0b1111111110101011)
def test_twos_comp_neg1(self):
self.assertEqual(emu8086.to_2compl(-1, True), 0xffff)
def test_sub_2compl_overflows(self):
self.assertEqual(emu8086.sub_2compl(1, 1, True), 0x10000)
def test_twos_comp(self):
self.assertEqual(emu8086.to_2compl(0, True), 0)
self.assertEqual(
# 7654321076543210
emu8086.to_2compl(0b0000000001111111, True),
0b0000000001111111
)
self.assertEqual(
# 7654321076543210
emu8086.to_2compl(-0b0000000001111111, True),
0b1111111110000001)
def test_subtract_2compl(self):
self.assertEqual(emu8086.sub_2compl(0, 1, True), 0xffff)
class TestPushPopState(unittest.TestCase):
def test_push_pop(self):
stack = emu8086.WordStack(100)
stack.set_pos(0x10)
self.assertEquals(hex(stack.pos()), hex(0x10))
"""
Value Address SP = 0x10
0x00 0x0C SP - 4
0x00 0x0D SP - 3
0x00 0x0E SP - 2
0x00 0x0F SP - 1
0x00 0x10 SP
0x00 0x11 SP + 1
"""
stack.push(0xabcd)
self.assertEquals(hex(stack.pos()), hex(0x0e))
"""
Value Address SP = 0x0E
0x00 0x0C SP - 2
0x00 0x0D SP - 1
0xCD 0x0E SP
0xAB 0x0F SP + 1
0x00 0x10 SP + 2
0x00 0x11 SP + 3
"""
self.assertEquals(hex(stack.pop()), hex(0xabcd))
self.assertEquals(hex(stack.pos()), hex(0x10))
"""
Value Address SP = 0x10
0x00 0x0C SP - 4
0x00 0x0D SP - 3
0xCD 0x0E SP - 2
0xAB 0x0F SP - 1
0x00 0x10 SP
0x00 0x11 SP + 1
"""
self.assertEquals(hex(stack.pop()), hex(0x0000))
def test_push_move_1_pop(self):
stack = emu8086.WordStack(100)
stack.set_pos(0x10)
self.assertEquals(hex(stack.pos()), hex(0x10))
"""
Value Address SP = 0x10
0x00 0x0C SP - 4
0x00 0x0D SP - 3
0x00 0x0E SP - 2
0x00 0x0F SP - 1
0x00 0x10 SP
0x00 0x11 SP + 1
"""
stack.push(0xabcd)
self.assertEquals(hex(stack.pos()), hex(0x0e))
"""
Value Address SP = 0x0E
0x00 0x0C SP - 2
0x00 0x0D SP - 1
0xCD 0x0E SP
0xAB 0x0F SP + 1
0x00 0x10 SP + 2
0x00 0x11 SP + 3
"""
stack.set_pos(stack.pos() - 1)
self.assertEquals(hex(stack.pos()), hex(0x0d))
"""
Value Address SP = 0x0F
0x00 0x0C SP - 1
0x00 0x0D SP
0xCD 0x0E SP + 1
0xAB 0x0F SP + 2
0x00 0x10 SP + 3
0x00 0x11 SP + 4
"""
self.assertEquals(hex(stack.pop()), hex(0xcd00))
self.assertEquals(hex(stack.pos()), hex(0x0f))
"""
Value Address SP = 0x0F
0x00 0x0C SP - 1
0x00 0x0D SP - 2
0xCD 0x0E SP - 1
0xAB 0x0F SP
0x00 0x10 SP + 1
0x00 0x11 SP + 2
"""
self.assertEquals(hex(stack.pop()), hex(0x00ab))
if __name__ == '__main__':
unittest.main()