def test_jumpa_invalid_target(self):
# arrange
sut = Vm()
sut.rom = [sut.OPC_NOP, sut.OPC_NOP, sut.OPC_JUMPA]
sut.accumulator = 5
sut.program_count = 2
# act
action = sut.next_step
# assert
self.assertRaises(InvalidPcException, action)
def test_jumpn_invalid_target_dont_fail(self):
# arrange
sut = Vm()
sut.accumulator = 4
sut.rom = [sut.OPC_NOP, sut.OPC_JUMPN, 4, sut.OPC_NOP]
sut.program_count = 1
# act
sut.next_step()
# assert
self.assertEqual(sut.program_count, 3)
def test_jumpa(self):
# arrange
sut = Vm()
sut.rom = [sut.OPC_NOP, sut.OPC_NOP, sut.OPC_JUMPA]
sut.accumulator = 1
sut.program_count = 2
# act
sut.next_step()
# assert
self.assertEqual(sut.program_count, 1)
def test_jumpn_dont_jump(self):
# arrange
sut = Vm()
sut.accumulator = 1
sut.rom = [sut.OPC_NOP, sut.OPC_JUMPN, 0, sut.OPC_NOP]
sut.program_count = 1
# act
sut.next_step()
# assert
self.assertEqual(sut.program_count, 3)
def test_jumpn_invalid_target_fail(self):
# arrange
sut = Vm()
sut.accumulator = -4
sut.rom = [sut.OPC_NOP, sut.OPC_JUMPN, 4, sut.OPC_NOP]
sut.program_count = 1
# act
action = sut.next_step
# assert
self.assertRaises(InvalidPcException, action)
def test_sub_indirect(self):
# arrange
sut = Vm()
sut.accumulator = 1
sut.rom = [sut.OPC_SUB_I, 0, sut.OPC_NOP]
sut.ram = [1, 2, 3]
# act
sut.next_step()
# assert
self.assertEqual(sut.accumulator, -1)
def test_sub_indirect_invalid_adress(self):
# arrange
sut = Vm()
sut.accumulator = 1
sut.rom = [sut.OPC_SUB_I, 2, sut.OPC_NOP]
sut.ram = [1, 2, 3]
# act
action = sut.next_step
# assert
self.assertRaises(InvalidRamAdressException, action)
def test_add_direct(self):
# arrange
sut = Vm()
sut.accumulator = 1
sut.rom = [sut.OPC_ADD, 0, sut.OPC_NOP]
sut.ram = [1, 2, 3]
# act
sut.next_step()
# assert
self.assertEqual(sut.accumulator, 2)
def test_ldpc(self):
# arrange
sut = Vm()
sut.rom = [sut.OPC_NOP, sut.OPC_LDPC, sut.OPC_NOP]
sut.program_count = 1
sut.accumulator = -4
# act
sut.next_step()
# assert
self.assertEqual(sut.accumulator, 1)
self.assertEqual(sut.program_count, 2)
def test_copyto_direct(self):
# arrange
sut = Vm()
sut.accumulator = 42
sut.rom = [sut.OPC_COPYTO, 2, sut.OPC_NOP]
# act
sut.next_step()
# assert
self.assertEqual(sut.program_count, 2)
self.assertEqual(sut.accumulator, 42)
self.assertEqual(sut.ram[2], 42)
def test_bumpdwn_indirect(self):
# arrange
sut = Vm()
sut.accumulator = 42
sut.ram = [1, 2, 3, 4]
sut.rom = [sut.OPC_BUMPDWN_I, 2, sut.OPC_NOP]
# act
sut.next_step()
# assert
self.assertEqual(sut.program_count, 2)
self.assertEqual(sut.accumulator, 3)
self.assertEqual(sut.ram, [1, 2, 3, 3])
def test_nop(self):
# arrange
sut = Vm()
sut.accumulator = 42
sut.ram = [1, 2, 3, 4]
sut.rom = [sut.OPC_NOP, sut.OPC_NOP]
# act
sut.next_step()
# assert
self.assertEqual(sut.program_count, 1)
self.assertEqual(sut.accumulator, 42)
self.assertEqual(sut.ram, [1, 2, 3, 4])
def test_push_outbox(self):
# arrange
mock_store = [-143] # random number
def mock(x):
mock_store[0] = x
sut = Vm()
sut.rom = [sut.OPC_OUTBOX, sut.OPC_NOP]
sut.ostream_subscribers.append(mock)
sut.accumulator = 42
# act
sut.next_step()
# assert
self.assertEqual(sut.program_count, 1)
self.assertEqual(sut.accumulator, 0)
self.assertEqual(mock_store[0], 42) # mock called