diff --git a/designer-base/src/test/java/com/fr/design/formula/FormulaPaneTest.java b/designer-base/src/test/java/com/fr/design/formula/FormulaPaneTest.java
index c82423daa3..4ac71b5ac0 100644
--- a/designer-base/src/test/java/com/fr/design/formula/FormulaPaneTest.java
+++ b/designer-base/src/test/java/com/fr/design/formula/FormulaPaneTest.java
@@ -22,4 +22,12 @@ public class FormulaPaneTest extends TestCase {
         Assert.assertArrayEquals(result, strs);
     }
 
-}
\ No newline at end of file
+    @Test
+    public void test4SimilarComparator() {
+        String[] strs = new String[]{"TESTB", "TESTACD", "Ftest", "Gtest", "TEST"};
+        String[] result = new String[]{"TEST", "TESTACD", "TESTB", "Ftest", "Gtest"};
+        Arrays.sort(strs, new FormulaPane.SimilarComparator("test"));
+        Assert.assertArrayEquals(result, strs);
+    }
+
+}