describe UserSerializer do
  # A real world example might have the eager_loads defined as a class method like UserSerializer.eager_loads
  let(:eager_loads) { [cars: :companyyy] }

  it 'eager loads correctly' do
    errors = EagerBeaver.new(User, eager_loads).errors
    expect(errors).to be_empty # failure: [companny is not an association of cars] is not empty
  end
end