This is xnu-11215.1.10. See this file in:
#ifndef _XNU_TESTS_IOKIT_SERVICE_HELPERS_H_
#define _XNU_TESTS_IOKIT_SERVICE_HELPERS_H_
#include <IOKit/IOKitLib.h>
__BEGIN_DECLS
int IOTestServiceFindService(const char * name, io_service_t * serviceOut);
__END_DECLS
#endif /* _XNU_TESTS_IOKIT_SERVICE_HELPERS_H_ */