diff -r d954a0212b95 -r 6f9f52ad75f5 vm/src/test/java/org/apidesign/vm4brwsr/StringTest.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/StringTest.java	Sat Nov 17 19:03:17 2012 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/StringTest.java	Sun Nov 18 08:28:28 2012 +0100
@@ -52,6 +52,22 @@
         );
     }
 
+    @Test public void concatCharsFromInts() throws Exception {
+        assertExec(
+            "Composing yields ABC",
+            "org_apidesign_vm4brwsr_StringSample_charsFromNumbersLjava_lang_String",
+            "ABC"
+        );
+    }
+
+    @Test public void concatCharsFromChars() throws Exception {
+        assertExec(
+            "Composing yields ABC",
+            "org_apidesign_vm4brwsr_StringSample_charsFromCharsLjava_lang_String",
+            "ABC"
+        );
+    }
+
     @Test(timeOut=10000) public void toStringConcatenation() throws Exception {
         assertExec(
             "Five executions should generate 5Hello World!",