package org.apidesign.component;

 import java.util.Iterator;

 import org.junit.BeforeClass;

 import org.junit.Test;

 import org.netbeans.junit.MockServices;

 import static org.junit.Assert.*;

 // BEGIN: lookup.mockservices.serviceloader

 public class InjectionViaServiceLoaderTest {

     public InjectionViaServiceLoaderTest() {

     }

     @BeforeClass

     public static void setUpClass() throws Exception {

         // this is a support for "dynamic" registration of any class

         // into the global pool of Lookup.getDefault() and 

         // java.util.ServiceLoader

         // either in @BeforeClass or @Before register 

         // classes of the mock instances that you want your code 

         // to find

         MockServices.setServices(ImplOne.class, ImplTwo.class);

     }

     @Test

     public void singleSlot() {

         InjectionSlot result = InjectionViaServiceLoader.singleSlot();

         assertNotNull("Some result found", result);

         assertEquals(

             "The first is ImplOne", ImplOne.class, result.getClass()

         );

     }

     @Test

     public void multiSlot() {

         Iterator<? extends InjectionSlot> it = 

             InjectionViaServiceLoader.multiSlot().iterator();

         assertTrue("Has at least one", it.hasNext());

         assertEquals(

             "The first is ImplOne", ImplOne.class, it.next().getClass()

         );

         assertTrue("Has two", it.hasNext());

         assertEquals(

             "The second is ImplTwo", ImplTwo.class, it.next().getClass()

         );

         assertFalse("No other instance registered", it.hasNext());

     }

     public static final class ImplOne extends InjectionSlot {

     }

     public static final class ImplTwo extends InjectionSlot {

     }

 }

 // END: lookup.mockservices.serviceloader