diff -r 28dc692f3b11 -r 66fdb47061aa rt/emul/compact/src/test/java/org/apidesign/bck2brwsr/tck/CompareStringsTest.java
--- a/rt/emul/compact/src/test/java/org/apidesign/bck2brwsr/tck/CompareStringsTest.java	Sun Apr 28 10:26:08 2013 +0200
+++ b/rt/emul/compact/src/test/java/org/apidesign/bck2brwsr/tck/CompareStringsTest.java	Sat Sep 28 02:43:18 2013 +0200
@@ -20,6 +20,7 @@
 import java.io.UnsupportedEncodingException;
 import java.net.MalformedURLException;
 import java.net.URL;
+import java.util.Locale;
 import org.apidesign.bck2brwsr.vmtest.Compare;
 import org.apidesign.bck2brwsr.vmtest.VMTest;
 import org.testng.annotations.Factory;
@@ -161,6 +162,19 @@
         assert res.equals("ba") : "Expecting ba: " + res;
         return res;
     }
+    
+    @Compare public String localeUS() {
+        return Locale.US.toString();
+    }
+    
+    @Compare public String localeFrench() {
+        return Locale.FRENCH.toString();
+    }
+    
+    
+    @Compare public String formatSimple() {
+        return String.format((Locale)null, "Hello %s!", "World");
+    }
 
     @Factory
     public static Object[] create() {