add Chapter 15 - runtime observer implementation

Chapter15/observer/libs/etl/test/UnitTest++/CurrentTest.h

@@ -0,0 +1,19 @@
+#ifndef UNITTEST_CURRENTTESTRESULTS_H
+#define UNITTEST_CURRENTTESTRESULTS_H
+
+#include "HelperMacros.h"
+
+namespace UnitTest {
+
+   class TestResults;
+   class TestDetails;
+
+   namespace CurrentTest
+   {
+      UNITTEST_LINKAGE TestResults*& Results();
+      UNITTEST_LINKAGE const TestDetails*& Details();
+   }
+
+}
+
+#endif