Function ffi_utils::test_utils::call_0

pub fn call_0<F>(f: F) -> Result<(), i32> where
    F: FnOnce(*mut c_void, extern "C" fn(_: *mut c_void, _: FfiResult)), 

Call a FFI function and block until its callback gets called. Use this if the callback accepts no arguments in addition to user_data and error_code.