ChromeDriver exception reporting “target window already closed” in headless mode

Question

I am using xUnit, SpecFlow, Selenium and headless Chrome to run automated tests, but every so often I will get a series of crashes when running on localhost when tr

Answer 1

As discussed the issue could be because of multiple reasons

1. svc.Port = Randomiser.Next(29700, 29900);. You should never assign the port yourself, it can be conflicting with some other program port as well and even the same port number can be generated in random which will cause the issue

2. You are launching scripts in parallel. In rare cases there could be a race condition in driver launch and the driver may fail to launch. So I would add Factory pattern to my driver initialization code like below

   public sealed class ChromeFactory 
   { 
       private static readonly object padlock = new object();
   
       ChromeFactory()
       {
       }
   
       public static WebDriver NewInstance
       {
           get
           {
               lock (padlock)
               {
                   return new ChromeDriver();
               }
           }
       }
   }
   

And initialize the driver like below

Context.Driver = ChromeFactory.NewInstance

3. Since you have parallel execution, I would recommend instead of using #2 suggestion, setup a selenium grid a browser limit count and use that. This will make life much more simpler for you