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33 lines
1.2 KiB
Python
33 lines
1.2 KiB
Python
import pytest
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from textual.widgets import Tree, TreeNode
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def label_of(node: TreeNode[None]):
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"""Get the label of a node.
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TODO: This is just a helper function to reduce the number of type
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errors, which can and will be remove once this code is merged with a
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version of main that also has the TreeNode.label PR merged.
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"""
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return str(node._label)
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def test_tree_node_children() -> None:
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"""A node's children property should act like an immutable list."""
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CHILDREN=23
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tree = Tree[None]("Root")
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for child in range(CHILDREN):
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tree.root.add(str(child))
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assert len(tree.root.children)==CHILDREN
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for child in range(CHILDREN):
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assert label_of(tree.root.children[child]) == str(child)
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assert label_of(tree.root.children[0]) == "0"
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assert label_of(tree.root.children[-1]) == str(CHILDREN-1)
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assert [label_of(node) for node in tree.root.children] == [str(n) for n in range(CHILDREN)]
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assert [label_of(node) for node in tree.root.children[:2]] == [str(n) for n in range(2)]
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with pytest.raises(TypeError):
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tree.root.children[0] = tree.root.children[1]
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with pytest.raises(TypeError):
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del tree.root.children[0]
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with pytest.raises(TypeError):
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del tree.root.children[0:2]
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