Tests - check rand num source of threads are initialised

Author: ethancrawford

app/server/ruby/test/lang/core/test_threads.rb

@@ -38,6 +38,14 @@ def test_in_thread
 
     end
 
+    def test_in_thread_random_source_initialised
+      @lang.run do
+        t = in_thread do
+          assert_equal :white, current_random_source
+        end
 
+        t.join
+      end
+    end
   end
 end