Add unit tests for all the expand/collapse/toggle Tree methods

tests/tree/test_tree_expand_etc.py

@@ -0,0 +1,106 @@
+from __future__ import annotations
+
+from textual.app import App, ComposeResult
+from textual.widgets import Tree
+
+
+class TreeApp(App[None]):
+    """Test tree app."""
+
+    def compose(self) -> ComposeResult:
+        yield Tree("Test")
+
+    def on_mount(self) -> None:
+        tree = self.query_one(Tree)
+        for n in range(10):
+            tree.root.add(f"Trunk {n}")
+        node = tree.root.children[0]
+        for n in range(10):
+            node = node.add(str(n))
+
+
+async def test_tree_node_expand() -> None:
+    """Expanding one node should not expand all nodes."""
+    async with TreeApp().run_test() as pilot:
+        pilot.app.query_one(Tree).root.expand()
+        assert pilot.app.query_one(Tree).root.is_expanded is True
+        check_node = pilot.app.query_one(Tree).root.children[0]
+        while check_node.children:
+            assert any(child.is_expanded for child in check_node.children) is False
+            check_node = check_node.children[0]
+
+
+async def test_tree_node_expand_all() -> None:
+    """Expanding all on a node should expand all child nodes too."""
+    async with TreeApp().run_test() as pilot:
+        pilot.app.query_one(Tree).root.expand_all()
+        assert pilot.app.query_one(Tree).root.is_expanded is True
+        check_node = pilot.app.query_one(Tree).root.children[0]
+        while check_node.children:
+            assert check_node.children[0].is_expanded is True
+            assert any(child.is_expanded for child in check_node.children[1:]) is False
+            check_node = check_node.children[0]
+
+
+async def test_tree_node_collapse() -> None:
+    """Collapsing one node should not collapse all nodes."""
+    async with TreeApp().run_test() as pilot:
+        pilot.app.query_one(Tree).root.expand_all()
+        pilot.app.query_one(Tree).root.children[0].collapse()
+        assert pilot.app.query_one(Tree).root.children[0].is_expanded is False
+        check_node = pilot.app.query_one(Tree).root.children[0].children[0]
+        while check_node.children:
+            assert all(child.is_expanded for child in check_node.children) is True
+            check_node = check_node.children[0]
+
+
+async def test_tree_node_collapse_all() -> None:
+    """Collapsing all on a node should collapse all child noes too."""
+    async with TreeApp().run_test() as pilot:
+        pilot.app.query_one(Tree).root.expand_all()
+        pilot.app.query_one(Tree).root.children[0].collapse_all()
+        assert pilot.app.query_one(Tree).root.children[0].is_expanded is False
+        check_node = pilot.app.query_one(Tree).root.children[0].children[0]
+        while check_node.children:
+            assert check_node.children[0].is_expanded is False
+            assert all(child.is_expanded for child in check_node.children[1:]) is True
+            check_node = check_node.children[0]
+
+
+async def test_tree_node_toggle() -> None:
+    """Toggling one node should not toggle all nodes."""
+    async with TreeApp().run_test() as pilot:
+        assert pilot.app.query_one(Tree).root.is_expanded is False
+        check_node = pilot.app.query_one(Tree).root.children[0]
+        while check_node.children:
+            assert any(child.is_expanded for child in check_node.children) is False
+            check_node = check_node.children[0]
+        pilot.app.query_one(Tree).root.toggle()
+        assert pilot.app.query_one(Tree).root.is_expanded is True
+        check_node = pilot.app.query_one(Tree).root.children[0]
+        while check_node.children:
+            assert any(child.is_expanded for child in check_node.children) is False
+            check_node = check_node.children[0]
+
+
+async def test_tree_node_toggle_all() -> None:
+    """Toggling all on a node should toggle all child nodes too."""
+    async with TreeApp().run_test() as pilot:
+        assert pilot.app.query_one(Tree).root.is_expanded is False
+        check_node = pilot.app.query_one(Tree).root.children[0]
+        while check_node.children:
+            assert any(child.is_expanded for child in check_node.children) is False
+            check_node = check_node.children[0]
+        pilot.app.query_one(Tree).root.toggle_all()
+        assert pilot.app.query_one(Tree).root.is_expanded is True
+        check_node = pilot.app.query_one(Tree).root.children[0]
+        while check_node.children:
+            assert check_node.children[0].is_expanded is True
+            assert any(child.is_expanded for child in check_node.children[1:]) is False
+            check_node = check_node.children[0]
+        pilot.app.query_one(Tree).root.toggle_all()
+        assert pilot.app.query_one(Tree).root.is_expanded is False
+        check_node = pilot.app.query_one(Tree).root.children[0]
+        while check_node.children:
+            assert any(child.is_expanded for child in check_node.children) is False
+            check_node = check_node.children[0]