Fix input test

Add mocks for some SDL functions related to joysticks/gamepads.

__mocks__/subprojects/SDL/SDL_joystick.mock.h

@@ -3,6 +3,7 @@
 
 #include <bdd-for-c-mocks.h>
 #include <SDL_joystick.h>
+#include <SDL_rwops.h>
 #include "../../../src/packages/common/IZ_common.h"
 
 #define MOCK_OPEN_JOYSTICKS 1
@@ -30,4 +31,13 @@ mock(SDL_JoystickGetGUID) SDL_JoystickGUID SDL_JoystickGetGUID(SDL_Joystick* joy
 	};
 }
 
+mock(SDL_GameControllerAddMappingsFromRW) int SDL_GameControllerAddMappingsFromRW(SDL_RWops *rw, int freerw) {
+	mock_return(SDL_GameControllerAddMappingsFromRW) 0;
+}
+
+mock(SDL_JoystickFromInstanceID) SDL_Joystick* SDL_JoystickFromInstanceID(SDL_JoystickID instance_id) {
+	static void* joystick = (void*) 1;
+	mock_return(SDL_JoystickFromInstanceID) (SDL_Joystick*) &joystick;
+}
+
 #endif