You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mod.rs
    path of file: ./repos/grafbase/engine/crates/parser-openapi/src/tests
    
    the code of the file until where you have to start completion: use std::sync::Once;

use assert_matches::assert_matches;
use engine::registry::{MetaType, UnionType};

u
    
fn test_all_of_schema_complex() {
    // Some allOf schemas have properties defined in multiple branches
    // of the allOf, with required sometiems being in one branch but not
    // another.  This is a test of that....
    insta::assert_snapshot!(build_registry(
        "test_data/all-ofs-complex.json",
        Format::Json,
        metadata("petstore", true)
    )
    .unwrap()
    .export_sdl(false));
}