diff -r 03be8510007c -r 51d08c49e9b6 vm/src/test/java/org/apidesign/vm4brwsr/StringTest.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/StringTest.java	Sun Nov 18 16:45:50 2012 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/StringTest.java	Sun Nov 18 21:58:44 2012 +0100
@@ -108,6 +108,14 @@
             "x_y_z", "x/y/z", (int)'/', (int)'_'
         );
     }
+
+    @Test public void insertBuilder() throws Exception {
+        assertExec(
+            "Can insert something into a buffer?",
+            "org_apidesign_vm4brwsr_StringSample_insertBufferLjava_lang_String",
+            "Ahoj Jardo!"
+        );
+    }
     
     @Test public void countAB() throws Exception {
         assertEquals(StringSample.countAB("Ahoj Bedo!"), 3, "Verify Java code is sane");