diff -r 3884815c0629 -r 23b4a344fe02 vm/src/test/java/org/apidesign/vm4brwsr/tck/CompareStringsTest.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/tck/CompareStringsTest.java	Sat Dec 15 08:17:45 2012 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/tck/CompareStringsTest.java	Sun Dec 16 18:49:35 2012 +0100
@@ -17,7 +17,6 @@
  */
 package org.apidesign.vm4brwsr.tck;
 
-import java.lang.reflect.Method;
 import org.apidesign.vm4brwsr.Compare;
 import org.apidesign.vm4brwsr.CompareVMs;
 import org.testng.annotations.Factory;
@@ -43,6 +42,49 @@
     @Compare public String nameOfArrayClass() throws Exception {
         return Class.forName("org.apidesign.vm4brwsr.Array").getName();
     }
+    
+    @Compare public String lowerHello() {
+        return "HeLlO".toLowerCase();
+    }
+    
+    @Compare public String lowerA() {
+        return String.valueOf(Character.toLowerCase('A')).toString();
+    }
+    @Compare public String upperHello() {
+        return "hello".toUpperCase();
+    }
+    
+    @Compare public String upperA() {
+        return String.valueOf(Character.toUpperCase('a')).toString();
+    }
+    
+    @Compare public boolean matchRegExp() throws Exception {
+        return "58038503".matches("\\d*");
+    }
+
+    @Compare public boolean doesNotMatchRegExp() throws Exception {
+        return "58038503GH".matches("\\d*");
+    }
+
+    @Compare public boolean doesNotMatchRegExpFully() throws Exception {
+        return "Hello".matches("Hell");
+    }
+    
+    @Compare public String variousCharacterTests() throws Exception {
+        StringBuilder sb = new StringBuilder();
+        
+        sb.append(Character.isUpperCase('a'));
+        sb.append(Character.isUpperCase('A'));
+        sb.append(Character.isLowerCase('a'));
+        sb.append(Character.isLowerCase('A'));
+        
+        sb.append(Character.isLetter('A'));
+        sb.append(Character.isLetterOrDigit('9'));
+        sb.append(Character.isLetterOrDigit('A'));
+        sb.append(Character.isLetter('0'));
+        
+        return sb.toString().toString();
+    }
         
     @Factory
     public static Object[] create() {