async def METHOD_NAME(spawn_auth_client):
    client = await spawn_auth_client()
    await client.add(
        ReferenceRoleAssignment("new_ref", "ryanf", ReferenceRole.BUILDER),
        ReferenceRoleAssignment("new_ref", "igboyes", ReferenceRole.MANAGER),
    )
    assert await client.list_reference_users("new_ref") == [
        ("igboyes", "manager"),
        ("ryanf", "builder"),
    ]