message: Avoid MockApi::new
diff: @@ -586,7 +586,7 @@ mod test {
  leave_default_data(&mut env);
  - let api = MockApi::new(8);
  + let api = MockApi::default();
  do_canonicalize_address::<MA, MS, MQ>(api, &mut env, source_ptr, dest_ptr).unwrap();
  let data = force_read(&env, dest_ptr);
  assert_eq!(data.len(), api.canonical_length);
  