class RegisterTest(unittest.TestCase):
def setUp(self):
self.registers = Registers()
def test_init_creates_registers(self):
self.assertNotIn('registers', Registers.__dict__)
registers = Registers()
self.assertIsInstance(registers.registers, dict)
def test_parse_instruction(self):
code, comparison = self.registers.parse_instruction('b inc 5 if a > 1')
self.assertEqual(code, ('b', 'inc', 5))
self.assertEqual(comparison, ('a', '>', 1))
def test_is_true(self):
self.registers.registers = {'a': 10}
self.assertTrue(self.registers.is_true(('a', '>', 1)))
self.assertFalse(self.registers.is_true(('a', '>', 10)))
self.assertTrue(self.registers.is_true(('foo', '>', -1)))
self.assertFalse(self.registers.is_true(('bar', '>', 0)))
self.assertTrue(self.registers.is_true(('a', '<', 11)))
self.assertFalse(self.registers.is_true(('a', '<', 9)))
self.assertTrue(self.registers.is_true(('a', '==', 10)))
self.assertFalse(self.registers.is_true(('a', '==', 1)))
self.assertTrue(self.registers.is_true(('a', '!=', 1)))
self.assertFalse(self.registers.is_true(('a', '!=', 10)))
self.assertTrue(self.registers.is_true(('a', '>=', 9)))
self.assertTrue(self.registers.is_true(('a', '>=', 10)))
self.assertFalse(self.registers.is_true(('a', '>=', 11)))
self.assertTrue(self.registers.is_true(('a', '<=', 11)))
self.assertTrue(self.registers.is_true(('a', '<=', 10)))
self.assertFalse(self.registers.is_true(('a', '<=', 9)))
with self.assertRaises(RuntimeError):
self.registers.is_true(('a', '===', 1))
def test_exececute_instruction(self):
self.registers.registers = {}
self.registers.execute_instruction(('a', 'inc', 1))
self.assertEqual(self.registers.registers['a'], 1)
self.registers.execute_instruction(('a', 'inc', 2))
self.assertEqual(self.registers.registers['a'], 3)
self.registers.execute_instruction(('b', 'dec', 1))
self.assertEqual(self.registers.registers['b'], -1)
self.registers.execute_instruction(('b', 'dec', 2))
self.assertEqual(self.registers.registers['b'], -3)
self.registers.execute_instruction(('b', 'inc', 10))
self.assertEqual(self.registers.registers['b'], 7)
with self.assertRaises(RuntimeError):
self.registers.execute_instruction(('a', 'mul', 2))
def test_exececute_instruction_stores_highest_value_ever(self):
self.registers.registers = {}
self.registers.execute_instruction(('a', 'inc', 10))
self.assertEqual(self.registers.highest_value_ever, 10)
self.registers.execute_instruction(('a', 'dec', 10))
self.assertEqual(self.registers.highest_value_ever, 10)
@patch.object(Registers, 'process_and_execute_instruction')
def test_parse_file(self, mock_process):
m = mock_open(read_data='foo\nbar\n')
with patch('registers.open', m):
self.registers.parse_file(sentinel.filename)
m.assert_called_once_with(sentinel.filename)
mock_process.assert_has_calls([call('foo\n'), call('bar\n')])
def test_get_largest_value(self):
self.registers.registers = {'a': 1, 'b': -10, 'c': 5}
self.assertEqual(self.registers.get_largest_value(), 5)
