diff --git a/inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/string/TestInitCapFunction.java b/inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/string/TestInitCapFunction.java
index 3a57833f9f3..3e98561618e 100644
--- a/inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/string/TestInitCapFunction.java
+++ b/inlong-sdk/transform-sdk/src/test/java/org/apache/inlong/sdk/transform/process/function/string/TestInitCapFunction.java
@@ -56,6 +56,6 @@ public void testInitCapFunction() throws Exception {
         // case3: initcap(null)
         List<String> output3 = processor2.transform("apache inLong", new HashMap<>());
         Assert.assertEquals(1, output3.size());
-        Assert.assertEquals(output3.get(0), "result=null");
+        Assert.assertEquals(output3.get(0), "result=");
     }
 }
\ No newline at end of file