def test_qsort_when_two(self):
arr = list(range(10, 0, -1))
result = qsort.qsort(arr)
self.assertEqual(result, list(range(1, 11)))
def test_qsort_when_two(self):
arr = [2, 1]
two_result = qsort.qsort(arr)
self.assertEqual(two_result, [1, 2])
def test_qsort_when_none_then_empty(self):
empty_result = qsort.qsort(None)
self.assertIsNotNone(empty_result, "None should not return None")
self.assertTrue(len(empty_result) == 0)
def test_qsort_when_one_then_one(self):
one_result = qsort.qsort([1])
self.assertTrue(len(one_result) == 1)
self.assertEqual(one_result[0], 1)
def test_qsort_when_empty_then_empty(self):
empty_result = qsort.qsort([])
self.assertIsNotNone(empty_result,
"empty array should not return None")
self.assertTrue(len(empty_result) == 0)