diff -r 0f3e13581901 -r 40cabcdcd2be samples/privilegedcreator/test/org/apidesign/privileged/use/MutexTest.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/samples/privilegedcreator/test/org/apidesign/privileged/use/MutexTest.java	Thu Oct 30 21:30:10 2014 +0100
@@ -0,0 +1,51 @@
+package org.apidesign.privileged.use;
+
+import org.apidesign.privileged.api.Mutex;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class MutexTest {
+    // BEGIN: mutex.init
+    private static final Mutex.Privileged PRIVILEGED = new Mutex.Privileged();
+    public static final Mutex MUTEX = new Mutex(PRIVILEGED);
+    // END: mutex.init
+
+    public MutexTest() {
+    }
+
+    /**
+     * Test of withLock method, of class Mutex.
+     */
+    @Test
+    public void readAccess() {
+        // BEGIN: mutex.use
+        class R implements Runnable {
+            int cnt;
+            
+            public void run() {
+                cnt++;
+            }
+        }
+        R r = new R();
+        MUTEX.withLock(r);
+        assertEquals("Counter increased", 1, r.cnt);
+        // END: mutex.use
+    }
+    
+    @Test
+    public void usePrivileged() {
+        int cnt = 0;
+        // BEGIN: mutex.privileged
+        try {
+            PRIVILEGED.lock();
+            // do the operation
+            cnt++;
+        } finally {
+           PRIVILEGED.unlock();
+        }
+        assertEquals("Counter increased", 1, cnt);
+        // END: mutex.privileged
+        
+    }
+
+}