engine: make test assert failure more pretty

engine/common/tests.h

@@ -17,12 +17,13 @@ extern struct tests_stats_s tests_stats;
 	if(!( exp )) \
 	{ \
 		tests_stats.failed++; \
-		Msg( "assert failed at %s:%i\n", __FILE__, __LINE__ ); \
+		Msg( S_ERROR "assert failed at %s:%i\n", __FILE__, __LINE__ ); \
 	} \
 	else tests_stats.passed++;
 
 void Test_RunImagelib( void );
 void Test_RunLibCommon( void );
+void Test_RunCommon( void );
 
 #endif