SERVER-38036 Turn on hybrid builds for background, unique indexes

1 files changed, 11 insertions, 1 deletions

diff --git a/src/mongo/dbtests/indexupdatetests.cpp b/src/mongo/dbtests/indexupdatetests.cpp
index 9c44428ef6d..0244ff0122e 100644
--- a/src/mongo/dbtests/indexupdatetests.cpp
+++ b/src/mongo/dbtests/indexupdatetests.cpp
@@ -206,7 +206,17 @@ public:
 
         ASSERT_OK(indexer.init(spec).getStatus());
         const Status status = indexer.insertAllDocumentsInCollection();
-        ASSERT_EQUALS(status.code(), ErrorCodes::DuplicateKey);
+        if (!background) {
+            ASSERT_EQUALS(status.code(), ErrorCodes::DuplicateKey);
+            return;
+        }
+
+        // Background builds do not detect duplicates until they commit.
+        ASSERT_OK(status);
+
+        WriteUnitOfWork wunit(&_opCtx);
+        ASSERT_THROWS_CODE(indexer.commit(), AssertionException, ErrorCodes::DuplicateKey);
+        wunit.commit();
     }
 };