def test_objects_regular_expression():
"""
Ensures regular expressions are compiled correctly
"""
tree = Tree('regular_expression', ['regexp'])
result = Objects.regular_expression(tree)
assert result == {'$OBJECT': 'regexp', 'regexp': tree.child(0)}
def test_tree_child_overflow():
tree = Tree('rule', ['child'])
assert tree.child(1) is None
def test_tree_child():
tree = Tree('rule', ['child'])
assert tree.child(0) == 'child'
def test_tree_child_overflow():
tree = Tree('rule', ['child'])
with raises(AssertionError):
tree.child(1)
def test_tree_child_overflow():
tree = Tree("rule", ["child"])
with raises(AssertionError):
tree.child(1)
def test_tree_child():
tree = Tree("rule", ["child"])
assert tree.child(0) == "child"
