Make tests a little more bullet-proof.
diff --git a/src/test/java/org/apache/commons/lang3/text/ExtendedMessageFormatTest.java b/src/test/java/org/apache/commons/lang3/text/ExtendedMessageFormatTest.java
index 7e2967c..b5f3717 100644
--- a/src/test/java/org/apache/commons/lang3/text/ExtendedMessageFormatTest.java
+++ b/src/test/java/org/apache/commons/lang3/text/ExtendedMessageFormatTest.java
@@ -406,7 +406,7 @@
 
         @Override
         public StringBuffer format(final Object obj, final StringBuffer toAppendTo, final FieldPosition pos) {
-            return toAppendTo.append(((String)obj).toLowerCase());
+            return toAppendTo.append(((String)obj).toLowerCase(Locale.ROOT));
         }
         @Override
         public Object parseObject(final String source, final ParsePosition pos) {