flat-tree implementation coming down the tubes

test/conftest.py

@@ -0,0 +1,15 @@
+import pytest
+
+from flat_tree.accessor import FlatTreeAccessor
+
+
+@pytest.fixture
+def tree():
+    return FlatTreeAccessor()
+
+
+@pytest.fixture
+def FlatTreeIterator():
+    from flat_tree.iterator import FlatTreeIterator
+
+    return FlatTreeIterator

test/test_accessor.py

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+import pytest
+
+
+def test_index(tree):
+    assert tree.index(0, 0) == 0
+    assert tree.index(0, 1) == 2
+    assert tree.index(0, 2) == 4
+
+
+def test_depth(tree):
+    assert tree.depth(5) == 1
+    assert tree.depth(3) == 2
+    assert tree.depth(4) == 0
+
+
+def test_offset(tree):
+    assert tree.offset(0) == 0
+    assert tree.offset(1) == 0
+    assert tree.offset(2) == 1
+    assert tree.offset(3) == 0
+    assert tree.offset(4) == 2
+
+    assert isinstance(tree.offset(0), int)
+
+
+def test_parent(tree):
+    assert tree.index(1, 0) == 1
+    assert tree.index(1, 1) == 5
+    assert tree.index(2, 0) == 3
+
+    assert tree.parent(0) == 1
+    assert tree.parent(2) == 1
+    assert tree.parent(1) == 3
+
+
+def test_sibling(tree):
+    assert tree.sibling(0) == 2
+    assert tree.sibling(2) == 0
+    assert tree.sibling(1) == 5
+    assert tree.sibling(5) == 1
+
+
+def test_children(tree):
+    assert tree.children(0) == []
+    assert tree.children(1) == [0, 2]
+    assert tree.children(3) == [1, 5]
+    assert tree.children(9) == [8, 10]
+
+
+def test_count(tree):
+    assert tree.count(0) == 1
+    assert tree.count(1) == 3
+    assert tree.count(3) == 7
+    assert tree.count(5) == 3
+    assert tree.count(23) == 15
+    assert tree.count(27) == 7
+
+
+def test_spans(tree):
+    assert tree.spans(0) == [0, 0]
+    assert tree.spans(1) == [0, 2]
+    assert tree.spans(3) == [0, 6]
+    assert tree.spans(23) == [16, 30]
+    assert tree.spans(27) == [24, 30]
+
+
+def test_left_span(tree):
+    assert tree.left_span(0) == 0
+    assert tree.left_span(1) == 0
+    assert tree.left_span(3) == 0
+    assert tree.left_span(23) == 16
+    assert tree.left_span(27) == 24
+
+
+def test_right_span(tree):
+    assert tree.right_span(0) == 0
+    assert tree.right_span(1) == 2
+    assert tree.right_span(3) == 6
+    assert tree.right_span(23) == 30
+    assert tree.right_span(27) == 30
+
+
+def test_full_roots(tree):
+    assert tree.full_roots(0) == []
+    assert tree.full_roots(2) == [0]
+    assert tree.full_roots(8) == [3]
+    assert tree.full_roots(20) == [7, 17]
+    assert tree.full_roots(18) == [7, 16]
+    assert tree.full_roots(16) == [7]
+
+    with pytest.raises(ValueError):
+        tree.full_roots(1)
+
+
+def test_left_child(tree):
+    assert tree.left_child(0) == -1
+    assert tree.left_child(1) == 0
+    assert tree.left_child(3) == 1
+
+
+def test_right_child(tree):
+    assert tree.right_child(0) == -1
+    assert tree.right_child(1) == 2
+    assert tree.right_child(3) == 5
+
+
+def test_parent_big_index(tree):
+    assert tree.parent(10000000000) == 10000000001
+
+
+def test_child_parent_child(tree):
+    child = 0
+
+    for _ in range(50):
+        child = tree.parent(child)
+    assert child == 1125899906842623
+
+    for _ in range(50):
+        child = tree.left_child(child)
+    assert child == 0

test/test_iterator.py

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+def test_iter_from_leaf(FlatTreeIterator):
+    tree_iter = FlatTreeIterator()
+
+    assert tree_iter.index == 0
+    assert tree_iter.parent() == 1
+    assert tree_iter.parent() == 3
+    assert tree_iter.parent() == 7
+    assert tree_iter.right_child() == 11
+    assert tree_iter.left_child() == 9
+    assert tree_iter.next() == 13
+    assert tree_iter.left_span() == 12
+
+
+def test_iter_not_from_leaf(FlatTreeIterator):
+    tree_iter = FlatTreeIterator(index=1)
+
+    assert tree_iter.index == 1
+    assert tree_iter.parent() == 3
+    assert tree_iter.parent() == 7
+    assert tree_iter.right_child() == 11
+    assert tree_iter.left_child() == 9
+    assert tree_iter.next() == 13
+    assert tree_iter.left_span() == 12

test/test_version.py

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+"""Version test module."""
+
+
+def test_version_fails_gracefully(mocker):
+    target = 'pkg_resources.get_distribution'
+    with mocker.patch(target, side_effect=Exception()):
+        from flat_tree.__init__ import __version__
+
+        assert __version__ == 'unknown'