diff --git a/tests/test_cases/expected_kdl/preserve_duplicate_nodes.kdl b/tests/test_cases/expected_kdl/preserve_duplicate_nodes.kdl
new file mode 100644
index 0000000..3e545b1
--- /dev/null
+++ b/tests/test_cases/expected_kdl/preserve_duplicate_nodes.kdl
@@ -0,0 +1,2 @@
+node
+node
diff --git a/tests/test_cases/input/preserve_duplicate_nodes.kdl b/tests/test_cases/input/preserve_duplicate_nodes.kdl
new file mode 100644
index 0000000..3e545b1
--- /dev/null
+++ b/tests/test_cases/input/preserve_duplicate_nodes.kdl
@@ -0,0 +1,2 @@
+node
+node