SERVER-21647 add missing $rename unit test

(cherry picked from commit b45dba8425b49714c5ca1394aba0bb97029c2560)

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mongo/db/ops/modifier_rename_test.cpp b/src/mongo/db/ops/modifier_rename_test.cpp
index e6d91c471b6..24d8be65a23 100644
--- a/src/mongo/db/ops/modifier_rename_test.cpp
+++ b/src/mongo/db/ops/modifier_rename_test.cpp
@@ -155,6 +155,12 @@ TEST(MoveOnSamePath, MoveDown) {
         mod.init(fromjson("{'b':'b.a'}").firstElement(), ModifierInterface::Options::normal()));
 }
 
+TEST(MoveOnSamePath, MoveToSelf) {
+    ModifierRename mod;
+    ASSERT_NOT_OK(
+        mod.init(fromjson("{'b.a':'b.a'}").firstElement(), ModifierInterface::Options::normal()));
+}
+
 TEST(MissingTo, SimpleNumberAtRoot) {
     Document doc(fromjson("{a: 2}"));
     Mod setMod(fromjson("{$rename: {'a':'b'}}"));