Add some test infrastructure.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3658 ed5197a5-7fde-0310-b194-c3ffbd925b24

src/tests.h

@@ -1,3 +1,9 @@
 #pragma once
 
-void tf_tests(const char* exe_path);
+typedef struct _tf_test_options_t
+{
+	const char* exe_path;
+	const char* tests;
+} tf_test_options_t;
+
+void tf_tests(const tf_test_options_t* options);