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  * accompanied this code. If applicable, add the following below the

  * License Header, with the fields enclosed by brackets [] replaced by

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  * The Original Software is NetBeans. The Initial Developer of the Original

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 package org.netbeans.html.boot.impl;

 import java.io.Closeable;

 import java.io.IOException;

 import java.io.Reader;

 import java.lang.reflect.Method;

 import java.net.URL;

 import java.util.Collection;

 import java.util.Enumeration;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import net.java.html.js.JavaScriptBody;

 import net.java.html.js.JavaScriptResource;

 import org.apidesign.html.boot.spi.Fn;

 import static org.testng.Assert.assertEquals;

 import org.testng.annotations.Test;

 /**

  *

  * @author Jaroslav Tulach

  */

 @JavaScriptResource("empty.js")

 public class CountFnCreationTest implements Fn.Presenter {

     private int cnt;

     @JavaScriptBody(args = {}, body = "return;")

     public static native void body();

     @Test public void countManyTimes() throws Exception {

         class Res implements FindResources {

             @Override

             public void findResources(String path, Collection<? super URL> results, boolean oneIsEnough) {

                 try {

                     ClassLoader l = CountFnCreationTest.class.getClassLoader();

                     Enumeration<URL> en = l.getResources(path);

                     while (en.hasMoreElements()) {

                         results.add(en.nextElement());

                     }

                 } catch (IOException ex) {

                     throw new IllegalStateException(ex);

                 }

             }

         }

         ClassLoader l = FnUtils.newLoader(new Res(), this, CountFnCreationTest.class.getClassLoader().getParent());

         Method m = l.loadClass(CountFnCreationTest.class.getName()).getMethod("body");

         Closeable c = Fn.activate(this);

         try {

             assertEquals(cnt, 0, "No functions yet");

             m.invoke(null);

             assertEquals(cnt, 1, "One function defined");

             m.invoke(null);

             assertEquals(cnt, 1, "Still one function");

         } finally {

             c.close();

         }

     }

     @Override

     public Fn defineFn(String code, String... names) {

         cnt++;

         return new MyFn(this);

     }

     @Override

     public void displayPage(URL page, Runnable onPageLoad) {

     }

     @Override

     public void loadScript(Reader code) throws Exception {

     }

     private static final class MyFn extends Fn {

         public MyFn(Presenter presenter) {

             super(presenter);

         }

         @Override

         public Object invoke(Object thiz, Object... args) throws Exception {

             return null;

         }

     }

 }