From 4b7e367a60d18e1af6acc4f14c41257625a45904 Mon Sep 17 00:00:00 2001
From: TomNicholas <tom@cworthy.org>
Date: Wed, 31 Jul 2024 02:04:19 -0400
Subject: [PATCH] add tests

---
 xarray/tests/test_datatree.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/xarray/tests/test_datatree.py b/xarray/tests/test_datatree.py
index 31d77ca17e7..6711212a5b1 100644
--- a/xarray/tests/test_datatree.py
+++ b/xarray/tests/test_datatree.py
@@ -35,6 +35,18 @@ def test_bad_names(self):
 
 
 class TestFamilyTree:
+    def test_dont_modify_parent_inplace(self):
+        # GH issue 9196
+        root = DataTree()
+        DataTree(name="child", parent=root)
+        assert root.children == {}
+
+    def test_dont_modify_children_inplace(self):
+        # GH issue 9196
+        child = DataTree()
+        DataTree(children={"child": child})
+        assert child.parent is None
+
     def test_setparent_unnamed_child_node_fails(self):
         john: DataTree = DataTree(name="john")
         with pytest.raises(ValueError, match="unnamed"):