public class MainClassApplicationUnderTest
extends ServerBackedApplicationUnderTest

An application under test fixture that can be used to test a server started by a “main” method.

 import ratpack.core.server.RatpackServer;
 import ratpack.test.MainClassApplicationUnderTest;

 import static org.junit.jupiter.api.Assertions.assertEquals;

 public class Example {

   public static class App {
     public static void main(String[] args) throws Exception {
       RatpackServer.start(s -> s
         .handlers(c -> c
           .get(ctx -> ctx.render("Hello world!"))
         )
       );
     }
   }

   public static void main(String[] args) throws Exception {
     new MainClassApplicationUnderTest(App.class).test(testHttpClient ->
       assertEquals("Hello world!", testHttpClient.getText())
     );
   }
 }
 

Note that this type implements CloseableApplicationUnderTest, and should be closed when no longer needed.