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✨ Add snapshot tests for Tree.node/clear expansion
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@davep
davep committed Jan 2, 2024
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157 changes: 157 additions & 0 deletions tests/snapshot_tests/__snapshots__/test_snapshots.ambr
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'''
# ---
# name: test_tree_clearing_and_expansion
'''
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'''
# ---
# name: test_tree_example
'''
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30 changes: 30 additions & 0 deletions tests/snapshot_tests/snapshot_apps/tree_clearing.py
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from textual.app import App, ComposeResult
from textual.widgets import Tree

class TreeClearingSnapshotApp(App[None]):

CSS = """
Screen {
layout: horizontal;
}
"""

@staticmethod
def _populate(tree: Tree) -> Tree:
for n in range(5):
branch = tree.root.add(str(n))
for m in range(5):
branch.add_leaf(f"{n}-{m}")
return tree

def compose(self) -> ComposeResult:
yield self._populate(Tree("Left", id="left"))
yield self._populate(Tree("Right", id="right"))

def on_mount(self) -> None:
self.query_one("#left", Tree).root.expand()
self.query_one("#left", Tree).clear()
self.query_one("#right", Tree).clear()

if __name__ == "__main__":
TreeClearingSnapshotApp().run()
7 changes: 7 additions & 0 deletions tests/snapshot_tests/test_snapshots.py
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Expand Up @@ -967,3 +967,10 @@ def test_zero_scrollbar_size(snap_compare):
"""Regression test for missing content with 0 sized scrollbars"""
# https://github.com/Textualize/textual/issues/3886
assert snap_compare(SNAPSHOT_APPS_DIR / "zero_scrollbar_size.py")


def test_tree_clearing_and_expansion(snap_compare):
"""Test the Tree.root.is_expanded state after a Tree.clear"""
# https://github.com/Textualize/textual/issues/3557
assert snap_compare(SNAPSHOT_APPS_DIR / "tree_clearing.py")

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