/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.jasper.servlet;

import java.util.ServiceLoader;

import javax.servlet.ServletContainerInitializer;

import org.junit.Test;

/**
 *
 */
public class TestJasperInitializer {

    @Test
    public void testServiceLoader() {
        ServiceLoader<ServletContainerInitializer> initializers =
                ServiceLoader.load(ServletContainerInitializer.class);
        for (ServletContainerInitializer initializer : initializers) {
            System.out.println(initializer.getClass().getName());
        }
    }
}

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.jasper.servlet;

import java.io.File;
import java.util.Collection;

import javax.servlet.ServletContainerInitializer;
import javax.servlet.ServletContext;

import org.junit.Assert;
import org.junit.Test;

import org.apache.catalina.core.StandardContext;
import org.apache.catalina.startup.Tomcat;
import org.apache.catalina.startup.TomcatBaseTest;
import org.apache.catalina.startup.WebappServiceLoader;

public class TestJasperInitializer extends TomcatBaseTest {

    @Test
    public void testServiceLoader() throws Exception {
        Tomcat tomcat = getTomcatInstance();
        File appDir = new File("test/webapp");
        // app dir is relative to server home
        StandardContext standardContext = (StandardContext) tomcat.addWebapp(null, "/test", appDir.getAbsolutePath());
        tomcat.start();

        ServletContext context = standardContext.getServletContext();
        WebappServiceLoader<ServletContainerInitializer> loader = new WebappServiceLoader<>(context);
        Collection<ServletContainerInitializer> initializers = loader.load(ServletContainerInitializer.class);
        Assert.assertEquals(1, initializers.size());
        Assert.assertTrue(initializers.iterator().next() instanceof JasperInitializer);
    }
}

Test case should assert SCI is actually loaded