def test_peek_with_one(self):
a = []
it = peek_iter(a)
self.assertFalseTwice(it.has_next)
self.assertEqualTwice([it.sentinel], it.peek, 1)
self.assertFalseTwice(it.has_next)
a = ['1']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['1'], it.peek, 1)
self.assertEqual('1', next(it))
self.assertFalseTwice(it.has_next)
self.assertEqualTwice([it.sentinel], it.peek, 1)
self.assertFalseTwice(it.has_next)
a = ['1', '2']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['1'], it.peek, 1)
self.assertEqual('1', next(it))
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['2'], it.peek, 1)
self.assertEqual('2', next(it))
self.assertFalseTwice(it.has_next)
self.assertEqualTwice([it.sentinel], it.peek, 1)
self.assertFalseTwice(it.has_next)
def test_next_with_multi(self):
a = []
it = peek_iter(a)
self.assertFalseTwice(it.has_next)
self.assertRaisesTwice(StopIteration, it.next, 2)
a = ['1']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertRaisesTwice(StopIteration, it.next, 2)
self.assertTrueTwice(it.has_next)
a = ['1', '2']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqual(['1', '2'], it.next(2))
self.assertFalseTwice(it.has_next)
a = ['1', '2', '3']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqual(['1', '2'], it.next(2))
self.assertTrueTwice(it.has_next)
self.assertRaisesTwice(StopIteration, it.next, 2)
self.assertTrueTwice(it.has_next)
a = ['1', '2', '3', '4']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqual(['1', '2'], it.next(2))
self.assertTrueTwice(it.has_next)
self.assertEqual(['3', '4'], it.next(2))
self.assertFalseTwice(it.has_next)
self.assertRaisesTwice(StopIteration, it.next, 2)
self.assertFalseTwice(it.has_next)
def test_next_with_none(self):
a = []
it = peek_iter(a)
self.assertFalseTwice(it.has_next)
self.assertRaisesTwice(StopIteration, it.next)
self.assertFalseTwice(it.has_next)
a = ['1']
it = peek_iter(a)
self.assertEqual('1', it.__next__())
a = ['1']
it = peek_iter(a)
self.assertNext(it, '1', is_last=True)
a = ['1', '2']
it = peek_iter(a)
self.assertNext(it, '1', is_last=False)
self.assertNext(it, '2', is_last=True)
a = ['1', '2', '3']
it = peek_iter(a)
self.assertNext(it, '1', is_last=False)
self.assertNext(it, '2', is_last=False)
self.assertNext(it, '3', is_last=True)
def test_peek_with_zero(self):
a = []
it = peek_iter(a)
self.assertFalseTwice(it.has_next)
self.assertEqualTwice([], it.peek, 0)
a = ['1']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice([], it.peek, 0)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice([], it.peek, 0)
a = ['1', '2']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice([], it.peek, 0)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice([], it.peek, 0)
def test_next_with_zero(self):
a = []
it = peek_iter(a)
self.assertFalseTwice(it.has_next)
self.assertRaisesTwice(StopIteration, it.next, 0)
a = ['1']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice([], it.next, 0)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice([], it.next, 0)
a = ['1', '2']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice([], it.next, 0)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice([], it.next, 0)
def test_peek_with_multi(self):
a = []
it = peek_iter(a)
self.assertFalseTwice(it.has_next)
self.assertEqualTwice([it.sentinel, it.sentinel], it.peek, 2)
self.assertFalseTwice(it.has_next)
a = ['1']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['1', it.sentinel], it.peek, 2)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['1', it.sentinel, it.sentinel], it.peek, 3)
self.assertTrueTwice(it.has_next)
a = ['1', '2']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['1', '2'], it.peek, 2)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['1', '2', it.sentinel], it.peek, 3)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['1', '2', it.sentinel, it.sentinel], it.peek, 4)
self.assertTrueTwice(it.has_next)
a = ['1', '2', '3']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['1', '2'], it.peek, 2)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['1', '2', '3'], it.peek, 3)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['1', '2', '3', it.sentinel], it.peek, 4)
self.assertTrueTwice(it.has_next)
self.assertEqual('1', next(it))
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['2', '3'], it.peek, 2)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['2', '3', it.sentinel], it.peek, 3)
self.assertTrueTwice(it.has_next)
self.assertEqualTwice(['2', '3', it.sentinel, it.sentinel], it.peek, 4)
self.assertTrueTwice(it.has_next)
def test_iter(self):
a = ['1', '2', '3']
it = peek_iter(a)
self.assertTrue(it is it.__iter__())
a = []
b = [i for i in peek_iter(a)]
self.assertEqual([], b)
a = ['1']
b = [i for i in peek_iter(a)]
self.assertEqual(['1'], b)
a = ['1', '2']
b = [i for i in peek_iter(a)]
self.assertEqual(['1', '2'], b)
a = ['1', '2', '3']
b = [i for i in peek_iter(a)]
self.assertEqual(['1', '2', '3'], b)
def test_init_with_sentinel(self):
a = iter(['1', '2', 'DONE'])
sentinel = 'DONE'
self.assertRaises(TypeError, peek_iter, a, sentinel)
def get_next():
return next(a)
it = peek_iter(get_next, sentinel)
self.assertEqual(it.sentinel, sentinel)
self.assertNext(it, '1', is_last=False)
self.assertNext(it, '2', is_last=True)
def test_next_with_one(self):
a = []
it = peek_iter(a)
self.assertFalseTwice(it.has_next)
self.assertRaisesTwice(StopIteration, it.next, 1)
a = ['1']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqual(['1'], it.next(1))
self.assertFalseTwice(it.has_next)
self.assertRaisesTwice(StopIteration, it.next, 1)
a = ['1', '2']
it = peek_iter(a)
self.assertTrueTwice(it.has_next)
self.assertEqual(['1'], it.next(1))
self.assertTrueTwice(it.has_next)
self.assertEqual(['2'], it.next(1))
self.assertFalseTwice(it.has_next)
self.assertRaisesTwice(StopIteration, it.next, 1)