def test_given_tree_then_correct_prune(self) -> None:
from cmaj.testing.ast import tree, token
node = tree(('X', [('X', [token('Y', 0), ('X', [token('Y', 1), token('Y', 2)])]),
('Y', [('X', [token('X', 3)])])]))
result = prune(node, 'Y')
expected = tree(('X', []))
self.assertEqual(expected, result)
def test_given_single_child_then_child_becomes_root(self) -> None:
from cmaj.testing.ast import tree, token
node = tree(('X', [token('X', 0)]))
result = skip(node, 'X')
expected = tree(token('X', 0))
self.assertEqual(expected, result)
def test_when_all_children_are_pruned_then_prune_empty_nodes(self) -> None:
from cmaj.testing.ast import tree, token
node = tree(('X', [token('Y', 0), ('Y', [token('X', 1), token('X', 2)])]))
result = prune(node, 'X')
expected = tree(('X', [token('Y', 0)]))
self.assertEqual(expected, result)
def test_given_nodes_to_squash_separated_by_other_node_then_no_squash(self) -> None:
from cmaj.testing.ast import tree, token
tree_def = ('X', [('Y', [token('X', 0)])])
result = squash(tree(tree_def), 'X')
self.assertEqual(tree(tree_def), result)
def test_given_root_with_leaf_to_prune_then_root_becomes_leaf(self) -> None:
from cmaj.testing.ast import tree, token
node = tree(('X', [token('X', 0)]))
result = prune(node, 'X')
expected = tree(('X', []))
self.assertEqual(expected, result)
def test_given_chain_then_squash_to_single_node(self) -> None:
from cmaj.testing.ast import tree, token
node = tree(('Y', [('X', [('X', [('X', [token('Y', 0)])])])]))
result = squash(node, 'X')
expected = tree(('Y', [('X', [token('Y', 0)])]))
self.assertEqual(expected, result)
def test_given_inner_node_to_squash_then_grandchildren_become_children(self) -> None:
from cmaj.testing.ast import tree, token
node = tree(('Y', [('X', [('X', [token('Y', 0), token('Y', 1)])])]))
result = squash(node, 'X')
expected = tree(('Y', [('X', [token('Y', 0), token('Y', 1)])]))
self.assertEqual(expected, result)
def test_given_many_children_to_squash_when_parent_is_root_then_no_squash(self) -> None:
from cmaj.testing.ast import tree, token
tree_def = ('X', [token('X', 0), token('X', 1)])
result = squash(tree(tree_def), 'X')
self.assertEqual(tree(tree_def), result)
def test_given_inner_nodes_not_to_skip_then_not_skipped(self) -> None:
from cmaj.testing.ast import tree, token
tree_def = ('X', [('Y', [token('X', 0)])])
result = skip(tree(tree_def), 'X')
self.assertEqual(tree(tree_def), result)
def test_given_many_children_then_not_skipped(self) -> None:
from cmaj.testing.ast import tree, token
tree_def = ('X', [token('X', 0), token('X', 1)])
result = skip(tree(tree_def), 'X')
self.assertEqual(tree(tree_def), result)
