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from __future__ import annotations
import pytest
from textual.app import App, ComposeResult
from textual.widgets import Tree
from textual.widgets.tree import RemoveRootError
class VerseBody:
pass
class VerseStar(VerseBody):
pass
class VersePlanet(VerseBody):
pass
class VerseMoon(VerseBody):
pass
class VerseTree(Tree[VerseBody]):
pass
class TreeClearApp(App[None]):
"""Tree clearing test app."""
def compose(self) -> ComposeResult:
yield VerseTree("White Sun", data=VerseStar())
def on_mount(self) -> None:
tree = self.query_one(VerseTree)
node = tree.root.add("Londinium", VersePlanet())
node.add_leaf("Balkerne", VerseMoon())
node.add_leaf("Colchester", VerseMoon())
node = tree.root.add("Sihnon", VersePlanet())
node.add_leaf("Airen", VerseMoon())
node.add_leaf("Xiaojie", VerseMoon())
async def test_tree_simple_clear() -> None:
"""Clearing a tree should keep the old root label and data."""
async with TreeClearApp().run_test() as pilot:
tree = pilot.app.query_one(VerseTree)
assert len(tree.root.children) > 1
pilot.app.query_one(VerseTree).clear()
assert len(tree.root.children) == 0
assert str(tree.root.label) == "White Sun"
assert isinstance(tree.root.data, VerseStar)
async def test_tree_reset_with_label() -> None:
"""Resetting a tree with a new label should use the new label and set the data to None."""
async with TreeClearApp().run_test() as pilot:
tree = pilot.app.query_one(VerseTree)
assert len(tree.root.children) > 1
pilot.app.query_one(VerseTree).reset(label="Jiangyin")
assert len(tree.root.children) == 0
assert str(tree.root.label) == "Jiangyin"
assert tree.root.data is None
async def test_tree_reset_with_label_and_data() -> None:
"""Resetting a tree with a label and data have that label and data used."""
async with TreeClearApp().run_test() as pilot:
tree = pilot.app.query_one(VerseTree)
assert len(tree.root.children) > 1
pilot.app.query_one(VerseTree).reset(label="Jiangyin", data=VersePlanet())
assert len(tree.root.children) == 0
assert str(tree.root.label) == "Jiangyin"
assert isinstance(tree.root.data, VersePlanet)
async def test_remove_node():
async with TreeClearApp().run_test() as pilot:
tree = pilot.app.query_one(VerseTree)
assert len(tree.root.children) == 2
tree.root.children[0].remove()
assert len(tree.root.children) == 1
async def test_remove_node_children():
async with TreeClearApp().run_test() as pilot:
tree = pilot.app.query_one(VerseTree)
assert len(tree.root.children) == 2
assert len(tree.root.children[0].children) == 2
tree.root.children[0].remove_children()
assert len(tree.root.children) == 2
assert len(tree.root.children[0].children) == 0
async def test_tree_remove_children_of_root():
"""Test removing the children of the root."""
async with TreeClearApp().run_test() as pilot:
tree = pilot.app.query_one(VerseTree)
assert len(tree.root.children) > 1
tree.root.remove_children()
assert len(tree.root.children) == 0
async def test_attempt_to_remove_root():
"""Attempting to remove the root should be an error."""
async with TreeClearApp().run_test() as pilot:
with pytest.raises(RemoveRootError):
pilot.app.query_one(VerseTree).root.remove()
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