checking in a failing test so that roman can take a look at it.

src/test/java/net/openhft/chronicle/map/ChronicleMapTest.java

@@ -1487,8 +1487,31 @@ public class ChronicleMapTest {
 
         }
 
+
     }
 
+
+    @Test
+    public void testOnheapAcquireUsingLockedStringBuilder() throws IOException {
+
+        try (final ChronicleMap<CharSequence, StringBuilder> map = ChronicleMapBuilder
+                .of(CharSequence.class, StringBuilder.class)
+                .entries(1000)
+                .defaultValue(new StringBuilder())
+                .entrySize(40).create()) {
+
+            StringBuilder value = new StringBuilder();
+
+
+            try (WriteContext<?, StringBuilder> context = map.acquireUsingLocked("one", value)) {
+                value.append("Hello World");
+            }
+
+            assertEquals("Hello World", value.toString());
+        }
+    }
+
+
     @Test
     public void testOnheapAcquireUsingLocked() throws IOException {
         ChronicleMapBuilder<CharSequence, LongValue> builder = ChronicleMapBuilder