convenient macro declaring friend for unittest classes to test private methods

CppUnitLite/Test.h

@@ -68,6 +68,12 @@ protected:
     testGroup##testName##Instance; \
   void testGroup##testName##Test::run (TestResult& result_) 
 
+/**
+ * Declare friend in a class to test its private methods
+ */
+#define FRIEND_TEST(testGroup, testName) \
+    friend class testGroup##testName##Test;
+
 /**
  * For debugging only: use TEST_UNSAFE to allow debuggers to have access to exceptions, as this
  * will not wrap execution with a try/catch block