Add an extra test

Author: jg-rp

CHANGELOG.md

@@ -4,8 +4,8 @@
 
 **Features**
 
-- Added `JSONPathNode.parent`, a reference the the node's parent node.
-- Changed `JSONPathNode.value` to be a `@property` and `setter`. When assigning to `JSONPathNode.value`, source data is updated too.
+- Added `JSONPathNode.parent`, a reference the the node's parent node. See [#21](https://github.com/jg-rp/python-jsonpath-rfc9535/issues/21).
+- Changed `JSONPathNode.value` to be a `@property` and `setter`. When assigning to `JSONPathNode.value`, source data is updated too. See [#21](https://github.com/jg-rp/python-jsonpath-rfc9535/issues/21).
 
 ## Version 0.1.6
 

jsonpath_rfc9535/node.py

@@ -17,7 +17,7 @@
 class JSONPathNode:
     """A JSON-like value and its location in a JSON document.
 
-    Assigning to `JSONPathNode.value` will automatically mutate source data.
+    Assigning to `JSONPathNode.value` will update and mutate source data too.
     Updating data after evaluating a query can invalidate existing child
     nodes. Use at your own risk.
 

tests/test_issues.py

@@ -4,3 +4,23 @@
 def test_issue_13() -> None:
     # This was failing with "unbalanced parentheses".
     _q = jsonpath.compile("$[? count(@.likes[? @.location]) > 3]")
+
+
+def test_issue_21() -> None:
+    data = {"foo": {"bar": {"baz": 42}}}
+    node = jsonpath.find_one("$.foo.bar.baz", data)
+
+    expected = 42
+    assert node is not None
+    assert node.value == expected
+    assert data["foo"]["bar"]["baz"] == expected
+
+    new_value = 99
+    node.value = new_value
+    assert node.value == new_value
+    assert data["foo"]["bar"]["baz"] == new_value
+
+    parent = node.parent
+    assert parent is not None
+    assert parent.value == {"baz": new_value}
+    assert parent.value["baz"] == new_value  # type: ignore