diff --git a/redfish-core/ut/registries_test.cpp b/redfish-core/ut/registries_test.cpp
index 87b92dc..95a093e 100644
--- a/redfish-core/ut/registries_test.cpp
+++ b/redfish-core/ut/registries_test.cpp
@@ -13,17 +13,13 @@
 
 TEST(FillMessageArgs, ArgsAreFilledCorrectly)
 {
-    std::string toFill("%1");
-    fillMessageArgs({{"foo"}}, toFill);
-    EXPECT_EQ(toFill, "foo");
-
-    toFill = "";
-    fillMessageArgs({}, toFill);
-    EXPECT_EQ(toFill, "");
-
-    toFill = "%1, %2";
-    fillMessageArgs({{"foo", "bar"}}, toFill);
-    EXPECT_EQ(toFill, "foo, bar");
+    EXPECT_EQ(fillMessageArgs({{"foo"}}, "%1"), "foo");
+    EXPECT_EQ(fillMessageArgs({}, ""), "");
+    EXPECT_EQ(fillMessageArgs({{"foo", "bar"}}, "%1, %2"), "foo, bar");
+    EXPECT_EQ(fillMessageArgs({{"foo"}}, "%1 bar"), "foo bar");
+    EXPECT_EQ(fillMessageArgs({}, "%1"), "");
+    EXPECT_EQ(fillMessageArgs({}, "%"), "");
+    EXPECT_EQ(fillMessageArgs({}, "%foo"), "");
 }
 } // namespace
-} // namespace redfish::registries
\ No newline at end of file
+} // namespace redfish::registries