engine: add simple unit-testing (v3?)

engine/common/tests.h

@@ -0,0 +1,28 @@
+#ifndef TESTS_H
+#define TESTS_H
+
+#if XASH_ENGINE_TESTS
+
+struct tests_stats_s
+{
+	uint passed;
+	uint failed;
+};
+
+extern struct tests_stats_s tests_stats;
+
+#define TRUN( x ) Msg( "Running " #x "\n" ); x
+
+#define TASSERT( exp ) \
+	if(!( exp )) \
+	{ \
+		tests_stats.failed++; \
+		Msg( "assert failed at %s:%i\n", __FILE__, __LINE__ ) \
+	} \
+	else tests_stats.passed++;
+
+void Test_RunLibCommon( void );
+
+#endif
+
+#endif /* TESTS_H */