Add CallQueue unit test

modules/beast_core/thread/beast_ThreadWithCallQueue.cpp

@@ -165,10 +165,13 @@ public:
     {
         explicit TestThread (int id)
             : ThreadWithCallQueue ("#" + String::fromNumber (id))
+            , interruptedOnce (false)
         {
             start (this);
         }
 
+        bool interruptedOnce;
+
         void threadInit ()
         {
         }
@@ -187,7 +190,10 @@ public:
             {
                 interrupted = interruptionPoint ();
                 if (interrupted)
+                {
+                    interruptedOnce = true;
                     break;
+                }
 
                 s = s + String::fromNumber (m_random.nextInt ());
 
@@ -195,6 +201,8 @@ public:
                     s = String::empty;
             }
 
+            bassert (interrupted);
+
             return interrupted;
         }
 
@@ -243,6 +251,11 @@ public:
             };
         }
 
+        for (int i = 0; i < threads.size(); ++i)
+        {
+            expect (threads[i]->interruptedOnce);
+        }
+
         for (int i = 0; i < threads.size(); ++i)
             threads[i]->stop (false);
         for (int i = 0; i < threads.size(); ++i)