def test_add(self):
add = get_builtins()['+']
with self.assertRaises(TypeError):
add()
self.assertEqual(add(3), 3)
self.assertEqual(add(3, 2), 5)
self.assertEqual(add(3, 2, 1), 6)
def test_mul(self):
mul = get_builtins()['*']
with self.assertRaises(TypeError):
mul()
with self.assertRaises(TypeError):
mul(123)
self.assertEqual(mul(3, 2), 6)
self.assertEqual(mul(4, 3, 2), 24)
def test_sub(self):
sub = get_builtins()['-']
with self.assertRaises(TypeError):
sub()
self.assertEqual(sub(123), -123)
self.assertEqual(sub(10, 2), 8)
with self.assertRaises(TypeError):
sub(1, 2, 3)
def test_operators(self):
data = [
('not', op.not_),
('/', op.truediv),
('=', op.eq),
('equal?', op.eq),
('eq?', op.is_),
('>', op.gt),
('<', op.lt),
('>=', op.ge),
('<=', op.le),
('length', len),
('append', op.add),
('display', print),
]
for name, expected in data:
actual = get_builtins()[name]
self.assertIs(actual, expected, 'bad "%s"' % (name,))
def test_islist(self):
islist = get_builtins()['list?']
self.assertFalse(islist(1))
self.assertFalse(islist('a'))
self.assertTrue(islist([1]))
def test_list(self):
list_ = get_builtins()['list']
self.assertEqual(list_(1, 2, 3), [1, 2, 3])
def test_cdr(self):
cdr = get_builtins()['cdr']
self.assertEqual(cdr([1, 2, 3]), [2, 3])
def test_car(self):
car = get_builtins()['car']
self.assertEqual(car([1, 2, 3]), 1)
def test_cons_is_unable_to_make_a_pair_like_it_ought_to(self):
cons = get_builtins()['cons']
with self.assertRaises(TypeError) as cm:
cons(1, 2)
def test_cons_should_prepend_to_existing_list(self):
cons = get_builtins()['cons']
self.assertEqual(cons(1, [2, 3]), [1, 2, 3])
def test_issymbol(self):
issymbol = get_builtins()['symbol?']
self.assertFalse(issymbol(1))
self.assertFalse(issymbol([1]))
self.assertFalse(issymbol([]))
self.assertTrue(issymbol('a'))
def test_isnull(self):
isnull = get_builtins()['null?']
self.assertFalse(isnull(1))
self.assertFalse(isnull('a'))
self.assertFalse(isnull([1]))
self.assertTrue(isnull([]))
