diff --git a/jspwiki-util/src/test/java/org/apache/wiki/util/TextUtilTest.java b/jspwiki-util/src/test/java/org/apache/wiki/util/TextUtilTest.java
index f3d6375..3f98af0 100644
--- a/jspwiki-util/src/test/java/org/apache/wiki/util/TextUtilTest.java
+++ b/jspwiki-util/src/test/java/org/apache/wiki/util/TextUtilTest.java
@@ -330,4 +330,11 @@
         Assertions.assertThrows( NoSuchElementException.class, () -> TextUtil.getRequiredProperty( props, "ber" ) );
     }
 
+    @Test
+    public void testCleanString() {
+        Assertions.assertNull( TextUtil.cleanString( null, TextUtil.PUNCTUATION_CHARS_ALLOWED ) );
+        Assertions.assertEquals( " This is a link ", TextUtil.cleanString( " [ This is a link ] ", TextUtil.PUNCTUATION_CHARS_ALLOWED ) );
+        Assertions.assertEquals( "ThisIsALink", TextUtil.cleanString( " [ This is a link ] ", TextUtil.LEGACY_CHARS_ALLOWED ) );
+    }
+
 }