def test_next_step_pc_larger_than_rom_InvalidPcException(self):
# arrange
sut = Vm()
sut.rom = [7, 7, 7]
sut.program_count = 4
# act
action = sut.next_step
# assert
self.assertRaises(InvalidPcException, action)
def test_jump_invalid_target(self):
# arrange
sut = Vm()
sut.program_count = 1
sut.rom = [sut.OPC_NOP, sut.OPC_JUMP, 3]
# act
action = sut.next_step
# assert
self.assertRaises(InvalidPcException, action)
def test_next_step_pc_negative_InvalidPcException(self):
# arrange
sut = Vm()
sut.rom = [7, 7, 7]
sut.program_count = -1
# act
action = sut.next_step
# assert
self.assertRaises(InvalidPcException, action)
def test_jump(self):
# arrange
sut = Vm()
sut.program_count = 1
sut.rom = [sut.OPC_NOP, sut.OPC_JUMP, 0]
# act
sut.next_step()
# assert
self.assertEqual(sut.program_count, 0)
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_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_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_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_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_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)