def test_select_empty_list(self):
e = Enumerable([])
result = e.select(lambda x: 'hello').to_list()
self.assertListEqual(result, [])
def test_select_to_list(self):
e = Enumerable(range(5))
result = e.select(lambda x: x * 2).to_list()
self.assertListEqual(result, [0, 2, 4, 6, 8])
def test_select_to_dict(self):
e = Enumerable(range(1, 4))
result = e.select(lambda x: 'a' * x).to_dict(lambda x: x,
lambda x: len(x))
self.assertDictEqual(result, {'a': 1, 'aa': 2, 'aaa': 3})
