public void Invoices()
{
var controller = new PdfController(apiClient);
var result = controller.Invoices("order", "xxx");
Assert.IsNull(result.Result);
var pdfKey = Portal.Properties.Settings.Default.pdfKey;
result = controller.Invoices("order", pdfKey);
Assert.IsTrue(apiClient.Parameters.ContainsKey("order_nos"));
Assert.IsInstanceOfType(result.Result, typeof(ViewResult));
Assert.IsInstanceOfType((result.Result as ViewResult).Model, typeof(List <Order>));
}