test.rb

describe 'service object' do
  let(:data) { { a: 1, b: 2 } }
  let(:dependency) { double() }

  before do
    allow(dependency).to receive(:call).and_return(data)
  end
  
  it 'wraps data from dependency into a hash' do
    result = Service.new(dependency).exec()
    expect(result[:success]).to be(true)
    expect(result[:data]).to eql(data)
  end
end