Improve the unordered tests support for some older compilers.

Better testing of elements with equivalent keys.


[SVN r7458]

test/helpers/fwd.hpp

@@ -12,6 +12,7 @@ namespace test
 {
     int generate(int const*);
     char generate(char const*);
+    signed char generate(signed char const*);
     std::string generate(std::string*);
     float generate(float const*);
     template <class T1, class T2>

test/helpers/generators.hpp

@@ -56,6 +56,12 @@ namespace test
         return (rand() >> 1) % (128-32) + 32;
     }
 
+    inline signed char generate(signed char const*)
+    {
+        using namespace std;
+        return rand();
+    }
+
     inline std::string generate(std::string const*)
     {
         using namespace std;