public async Task Browsing_invoices()
 {
     await Runner
     .AddAsyncSteps(
         _ => Given_invoice("Invoice-1"),
         _ => Given_invoice("Invoice-2"))
     .AddSteps(
         When_I_request_all_historical_invoices)
     .AddSteps(
         _ => Then_I_should_see_invoices("Invoice-1", "Invoice-2"))
     .RunAsync();
 }