change fixed length test

tests/sensitiveMessageFormatterTest.php

@@ -84,6 +84,12 @@ class sensitiveMessageFormatterTest extends ApiTestCase
             );
         }
 
+        $this->setValue(
+            $this->sut,
+            'fixedReplacementLength',
+            $fixedReplacementLenth
+        );
+
         $this->callMethod(
             $this->sut,
             'createReplacements',