def test_binary_two_present1(self):
list = [10, 20]
result = recurse.binary_search(list, 10)
self.assertEqual(0, result)
def test_binary_two_present2(self):
list = [11, 33]
result = recurse.binary_search(list, 33)
self.assertEqual(1, result)
def test_binary_one_absent(self):
list = [1]
result = recurse.binary_search(list, 2)
self.assertEqual(None, result)
def test_binary_one_present(self):
list = [1]
result = recurse.binary_search(list, 1)
self.assertEqual(0, result)
def test_binary_empty(self):
list = []
result = recurse.binary_search(list, 1)
self.assertEqual(None, result)
def test_binary_many_present(self):
list = [-10, -4, -1, 0, 4, 12, 56, 98]
result = recurse.binary_search(list, -1)
self.assertEqual(2, result)
def test_binary_many_none(self):
list = [1, 2, 3, 4, 5, 6]
result = recurse.binary_search(list, 9)
self.assertEqual(None, result)