1 files changed, 37 insertions, 0 deletions
diff --git a/src/mongo/db/ops/modifier_set_test.cpp b/src/mongo/db/ops/modifier_set_test.cpp
index 1579b096722..b83270da957 100644
--- a/src/mongo/db/ops/modifier_set_test.cpp
+++ b/src/mongo/db/ops/modifier_set_test.cpp
@@ -429,6 +429,43 @@ TEST(IndexedMod, PrepareNonViablePath) {
     ASSERT_NOT_OK(setMod.prepare(doc.root(), "", &execInfo));
 }
 
+TEST(IndexedMod, PrepareReportCreatedArrayElement) {
+    Document doc(fromjson("{a: [{b: 0}]}"));
+    Mod setMod(fromjson("{$set: {'a.1.c': 2}}"));
+
+    ModifierInterface::ExecInfo execInfo;
+    ASSERT_OK(setMod.prepare(doc.root(), "", &execInfo));
+
+    ASSERT_EQUALS(execInfo.fieldRef[0]->dottedField(), "a.1.c");
+    ASSERT_TRUE(execInfo.indexOfArrayWithNewElement[0]);
+    ASSERT_EQUALS(*execInfo.indexOfArrayWithNewElement[0], 0u);
+    ASSERT_FALSE(execInfo.noOp);
+}
+
+TEST(IndexedMod, PrepareDoNotReportModifiedArrayElement) {
+    Document doc(fromjson("{a: [{b: 0}]}"));
+    Mod setMod(fromjson("{$set: {'a.0.c': 2}}"));
+
+    ModifierInterface::ExecInfo execInfo;
+    ASSERT_OK(setMod.prepare(doc.root(), "", &execInfo));
+
+    ASSERT_EQUALS(execInfo.fieldRef[0]->dottedField(), "a.0.c");
+    ASSERT_FALSE(execInfo.indexOfArrayWithNewElement[0]);
+    ASSERT_FALSE(execInfo.noOp);
+}
+
+TEST(IndexedMod, PrepareDoNotReportCreatedNumericObjectField) {
+    Document doc(fromjson("{a: {'0': {b: 0}}}"));
+    Mod setMod(fromjson("{$set: {'a.1.c': 2}}"));
+
+    ModifierInterface::ExecInfo execInfo;
+    ASSERT_OK(setMod.prepare(doc.root(), "", &execInfo));
+
+    ASSERT_EQUALS(execInfo.fieldRef[0]->dottedField(), "a.1.c");
+    ASSERT_FALSE(execInfo.indexOfArrayWithNewElement[0]);
+    ASSERT_FALSE(execInfo.noOp);
+}
+
 TEST(IndexedMod, PrepareApplyInPlace) {
     Document doc(fromjson("{a: [{b: 0},{b: 1},{b: 1}]}"));
     Mod setMod(fromjson("{$set: {'a.2.b': 2}}"));