LUCENE-2155: add assertion to check if something changes default locale behind our back when using LocalizedTestCase

git-svn-id: https://svn.apache.org/repos/asf/lucene/java/trunk@890427 13f79535-47bb-0310-9956-ffa450edef68

src/test/org/apache/lucene/util/LocalizedTestCase.java

@@ -73,6 +73,8 @@ public abstract class LocalizedTestCase extends LuceneTestCase {
 
   @Override
   protected void tearDown() throws Exception {
+    assertEquals("default locale unexpectedly changed:", locale, Locale
+        .getDefault());
     Locale.setDefault(defaultLocale);
     super.tearDown();
   }