def test_empty_array(self):
with self.assertRaisesWithMessage(ValueError):
binary_search([], 1)
def test_finds_value_in_array_with_one_element(self):
self.assertEqual(binary_search([6], 6), 0)
def test_identifies_value_missing(self):
with self.assertRaisesWithMessage(ValueError):
binary_search([1, 3, 4, 6, 8, 9, 11], 7)
def test_value_larger_than_arrays_maximum(self):
with self.assertRaisesWithMessage(ValueError):
binary_search([1, 3, 4, 6, 8, 9, 11], 13)
def test_finds_value_in_array_of_even_length(self):
self.assertEqual(
binary_search([1, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377], 21),
5)
def test_finds_value_in_array_of_odd_length(self):
self.assertEqual(
binary_search([1, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 634],
144), 9)
def test_finds_value_at_end_of_array(self):
self.assertEqual(binary_search([1, 3, 4, 6, 8, 9, 11], 11), 6)
def test_finds_value_at_beginning_of_array(self):
self.assertEqual(binary_search([1, 3, 4, 6, 8, 9, 11], 1), 0)
def test_finds_value_in_middle_of_array(self):
self.assertEqual(binary_search([1, 3, 4, 6, 8, 9, 11], 6), 3)
