1 files changed, 10 insertions, 2 deletions
diff --git a/searchlib/src/tests/attribute/attribute_operation/attribute_operation_test.cpp b/searchlib/src/tests/attribute/attribute_operation/attribute_operation_test.cpp
index 12bac6c6b20..bdd5682acb6 100644
--- a/searchlib/src/tests/attribute/attribute_operation/attribute_operation_test.cpp
+++ b/searchlib/src/tests/attribute/attribute_operation/attribute_operation_test.cpp
@@ -45,10 +45,11 @@ TEST("test illegal operations on float attribute") {
 }
 
 AttributeVector::SP
-createAttribute(BasicType basicType, const vespalib::string &fieldName, bool fastSearch = false)
+createAttribute(BasicType basicType, const vespalib::string &fieldName, bool fastSearch = false, bool immutable = false)
 {
     Config cfg(basicType, CollectionType::SINGLE);
-    cfg.setFastSearch(fastSearch);
+    cfg.setMutable(!immutable)
+       .setFastSearch(fastSearch);
     auto av = search::AttributeFactory::createAttribute(fieldName, cfg);
     while (20 >= av->getNumDocs()) {
         AttributeVector::DocId checkDocId(0u);
@@ -176,4 +177,11 @@ TEST("test that fastsearch attributes will fail to update") {
     }
 }
 
+TEST("test that immutable attributes will fail to update") {
+    auto attr = createAttribute(BasicType::INT64, "ai", true, false);
+    for (auto operation : {"++", "--", "+=7", "-=9", "*=3", "/=3", "%=3"}) {
+        TEST_DO(verify<int64_t>(BasicType::INT64, operation, *attr, 7, 7));
+    }
+}
+
 TEST_MAIN() { TEST_RUN_ALL(); }