def test_peek(self):
# Test peeking into various sequence types
# tuple
is_empty, seq = peek(tuple())
self.assertEqual((is_empty, list(seq)), (True, []))
is_empty, seq = peek((1, 2, 3))
self.assertEqual((is_empty, list(seq)), (False, [1, 2, 3]))
# list
is_empty, seq = peek([])
self.assertEqual((is_empty, list(seq)), (True, []))
is_empty, seq = peek([1, 2, 3])
self.assertEqual((is_empty, list(seq)), (False, [1, 2, 3]))
# set
is_empty, seq = peek(set())
self.assertEqual((is_empty, list(seq)), (True, []))
is_empty, seq = peek({1, 2, 3})
self.assertEqual((is_empty, list(seq)), (False, [1, 2, 3]))
# range
is_empty, seq = peek(range(0))
self.assertEqual((is_empty, list(seq)), (True, []))
is_empty, seq = peek(range(1, 4))
self.assertEqual((is_empty, list(seq)), (False, [1, 2, 3]))
# map
is_empty, seq = peek(map(int, []))
self.assertEqual((is_empty, list(seq)), (True, []))
is_empty, seq = peek(map(int, [1, 2, 3]))
self.assertEqual((is_empty, list(seq)), (False, [1, 2, 3]))
# generator
is_empty, seq = peek((i for i in []))
self.assertEqual((is_empty, list(seq)), (True, []))
is_empty, seq = peek((i for i in [1, 2, 3]))
self.assertEqual((is_empty, list(seq)), (False, [1, 2, 3]))
def test_peek(self):
# Test peeking into various sequence types
# tuple
is_empty, seq = peek(tuple())
self.assertEqual((is_empty, list(seq)), (True, []))
is_empty, seq = peek((1, 2, 3))
self.assertEqual((is_empty, list(seq)), (False, [1, 2, 3]))
# list
is_empty, seq = peek([])
self.assertEqual((is_empty, list(seq)), (True, []))
is_empty, seq = peek([1, 2, 3])
self.assertEqual((is_empty, list(seq)), (False, [1, 2, 3]))
# set
is_empty, seq = peek(set())
self.assertEqual((is_empty, list(seq)), (True, []))
is_empty, seq = peek({1, 2, 3})
self.assertEqual((is_empty, list(seq)), (False, [1, 2, 3]))
# range
is_empty, seq = peek(range(0))
self.assertEqual((is_empty, list(seq)), (True, []))
is_empty, seq = peek(range(1, 4))
self.assertEqual((is_empty, list(seq)), (False, [1, 2, 3]))
# map
is_empty, seq = peek(map(int, []))
self.assertEqual((is_empty, list(seq)), (True, []))
is_empty, seq = peek(map(int, [1, 2, 3]))
self.assertEqual((is_empty, list(seq)), (False, [1, 2, 3]))
# generator
is_empty, seq = peek((i for i in []))
self.assertEqual((is_empty, list(seq)), (True, []))
is_empty, seq = peek((i for i in [1, 2, 3]))
self.assertEqual((is_empty, list(seq)), (False, [1, 2, 3]))