class TestEmptyTree(unittest.TestCase):
def setUp(self) -> None:
self.empty_tree = BST()
def test_empty(self):
self.assertTrue(self.empty_tree.empty)
def test_value(self):
self.assertIsNone(self.empty_tree.value)
def test_left(self):
self.assertEqual(self.empty_tree.left, BST())
def test_right(self):
self.assertEqual(self.empty_tree.right, BST())
def test_min(self):
self.assertRaises(ValueError, lambda: self.empty_tree.min)
def test_max(self):
self.assertRaises(ValueError, lambda: self.empty_tree.max)
def test_values(self):
self.assertEqual(self.empty_tree.values, frozenset())
def test_contains(self):
self.assertNotIn(1, self.empty_tree)
self.assertNotIn("foo", self.empty_tree)
self.assertNotIn(-42, self.empty_tree)
self.assertNotIn("bar", self.empty_tree)
def test_closest_to(self):
self.assertRaises(ValueError, lambda: self.empty_tree.closest_to(1, distance=None))
def test_closest_to_four_with_degenerate_tree(self):
spy_float_distance = mock.MagicMock()
spy_float_distance.side_effect = self.float_distance
tree = BST(1, None, BST(2, None, BST(3)))
closest_to, distance = tree.closest_to(4, spy_float_distance)
self.assertEqual(closest_to, 3)
self.assertEqual(distance, 1)
calls_args = spy_float_distance.call_args_list
expected_calls_args = [mock.call(4, 3)]
self.assertEqual(calls_args, expected_calls_args)
def test_closest_to_two_and_three_quarters_without_three(self):
spy_float_distance = mock.MagicMock()
spy_float_distance.side_effect = self.float_distance
tree = BST(2., BST(1.))
closest_to, distance = tree.closest_to(2.75, spy_float_distance)
self.assertEqual(closest_to, 2)
self.assertEqual(distance, 0.75)
calls_args = spy_float_distance.call_args_list
expected_calls_args = [mock.call(2.75, 2)]
self.assertEqual(calls_args, expected_calls_args)
class TestBST(unittest.TestCase):
one_leaf = BST(1.)
three_leaf = BST(3.)
def setUp(self) -> None:
self.tree = BST(2., self.one_leaf, self.three_leaf)
def test_empty(self):
self.assertFalse(self.tree.empty)
def test_value(self):
self.assertEqual(self.tree.value, 2)
def test_left(self):
self.assertEqual(self.tree.left, self.one_leaf)
def test_right(self):
self.assertEqual(self.tree.right, self.three_leaf)
def test_min(self):
self.assertEqual(self.tree.min, 1)
def test_max(self):
self.assertEqual(self.tree.max, 3)
def test_contains(self):
self.assertIn(1, self.tree)
self.assertIn(2, self.tree)
self.assertIn(3, self.tree)
self.assertNotIn(4, self.tree)
self.assertNotIn(5, self.tree)
self.assertNotIn(6, self.tree)
def test_values(self):
self.assertEqual(self.tree.values, frozenset({1, 2, 3}))
def test_closest_to_zero(self):
spy_float_distance = mock.MagicMock()
spy_float_distance.side_effect = self.float_distance
self.assertEqual(self.tree.closest_to(0, spy_float_distance), (1, 1))
calls_args = spy_float_distance.call_args_list
expected_calls_args = [mock.call(0, 1)]
self.assertEqual(calls_args, expected_calls_args)
def test_closest_to_one_and_three_quarters(self):
spy_float_distance = mock.MagicMock()
spy_float_distance.side_effect = self.float_distance
closest_to, distance = self.tree.closest_to(1.75, spy_float_distance)
self.assertEqual(closest_to, 2)
self.assertEqual(distance, 0.25)
calls_args = spy_float_distance.call_args_list
expected_calls_args = [mock.call(1.75, 2), mock.call(1.75, 1)]
self.assertEqual(calls_args, expected_calls_args)
def test_closest_to_two_and_three_quarters(self):
spy_float_distance = mock.MagicMock()
spy_float_distance.side_effect = self.float_distance
closest_to, distance = self.tree.closest_to(2.75, spy_float_distance)
self.assertEqual(closest_to, 3)
self.assertEqual(distance, 0.25)
calls_args = spy_float_distance.call_args_list
expected_calls_args = [mock.call(2.75, 2), mock.call(2.75, 3)]
self.assertEqual(calls_args, expected_calls_args)
def test_closest_to_two_and_three_quarters_without_three(self):
spy_float_distance = mock.MagicMock()
spy_float_distance.side_effect = self.float_distance
tree = BST(2., BST(1.))
closest_to, distance = tree.closest_to(2.75, spy_float_distance)
self.assertEqual(closest_to, 2)
self.assertEqual(distance, 0.75)
calls_args = spy_float_distance.call_args_list
expected_calls_args = [mock.call(2.75, 2)]
self.assertEqual(calls_args, expected_calls_args)
def test_closest_to_zero_with_degenerate_tree(self):
spy_float_distance = mock.MagicMock()
spy_float_distance.side_effect = self.float_distance
tree = BST(3, BST(2, BST(1)))
closest_to, distance = tree.closest_to(0, spy_float_distance)
self.assertEqual(closest_to, 1)
self.assertEqual(distance, 1)
calls_args = spy_float_distance.call_args_list
expected_calls_args = [mock.call(0, 1)]
self.assertEqual(calls_args, expected_calls_args)
def test_closest_to_four_with_degenerate_tree(self):
spy_float_distance = mock.MagicMock()
spy_float_distance.side_effect = self.float_distance
tree = BST(1, None, BST(2, None, BST(3)))
closest_to, distance = tree.closest_to(4, spy_float_distance)
self.assertEqual(closest_to, 3)
self.assertEqual(distance, 1)
calls_args = spy_float_distance.call_args_list
expected_calls_args = [mock.call(4, 3)]
self.assertEqual(calls_args, expected_calls_args)
@staticmethod
def float_distance(a, b):
return abs(a - b)
