Add Dumas JSON object iterator node

tests/test_dumas_json_nodes.py

@@ -6,6 +6,7 @@ from dumas_json_nodes import (
     DumasJSONGetValueNode,
     DumasJSONKeysNode,
     DumasJSONMergeObjectsNode,
+    DumasJSONObjectIteratorNode,
     DumasJSONObjectToStringNode,
     DumasJSONStringToObjectNode,
     DumasJSONSetValueNode,
@@ -109,6 +110,41 @@ class DumasJSONNodeTests(unittest.TestCase):
 
         self.assertEqual(result, (None, -1, 0))
 
+    def test_object_iterator_fixed_mode_uses_given_index(self):
+        node = DumasJSONObjectIteratorNode()
+
+        result = node.iterate({"first": "a", "second": "b", "third": "c"}, 1, "fixed")
+
+        self.assertEqual(result, ("second", "b", 1, 3))
+
+    def test_object_iterator_incr_mode_advances_index(self):
+        node = DumasJSONObjectIteratorNode()
+
+        result = node.iterate({"first": "a", "second": "b", "third": "c"}, 1, "incr")
+
+        self.assertEqual(result, ("third", "c", 2, 3))
+
+    def test_object_iterator_decr_mode_decrements_index(self):
+        node = DumasJSONObjectIteratorNode()
+
+        result = node.iterate({"first": "a", "second": "b", "third": "c"}, 1, "decr")
+
+        self.assertEqual(result, ("first", "a", 0, 3))
+
+    def test_object_iterator_clamps_out_of_range_index(self):
+        node = DumasJSONObjectIteratorNode()
+
+        result = node.iterate({"first": "a", "second": "b", "third": "c"}, 99, "fixed")
+
+        self.assertEqual(result, ("third", "c", 2, 3))
+
+    def test_object_iterator_handles_empty_objects(self):
+        node = DumasJSONObjectIteratorNode()
+
+        result = node.iterate({}, 0, "fixed")
+
+        self.assertEqual(result, (None, None, -1, 0))
+
 
 if __name__ == "__main__":
     unittest.main()