From http://javaevangelist.blogspot.com/2013/09/java-ee-tip-of-day-webfilter-testing.html

HeaderFilterIntegrationTest.java

package com.bluelotussoftware.example.filter;
 
import java.net.URL;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jboss.arquillian.container.test.api.Deployment;
import org.jboss.arquillian.container.test.api.RunAsClient;
import org.jboss.arquillian.drone.api.annotation.Drone;
import org.jboss.arquillian.junit.Arquillian;
import org.jboss.arquillian.test.api.ArquillianResource;
import org.jboss.arquillian.warp.Activity;
import org.jboss.arquillian.warp.Inspection;
import org.jboss.arquillian.warp.Warp;
import org.jboss.arquillian.warp.WarpTest;
import org.jboss.arquillian.warp.servlet.AfterServlet;
import org.jboss.arquillian.warp.servlet.BeforeServlet;
import org.jboss.shrinkwrap.api.ShrinkWrap;
import org.jboss.shrinkwrap.api.spec.WebArchive;
import org.junit.Test;
import static org.junit.Assert.*;
import org.junit.runner.RunWith;
import org.openqa.selenium.WebDriver;
 
/**
 * <p>
 * Checks the {@link HeaderFilter} initialization parameter set the enabled to
 * confirm that headers are added to the {@link HttpServletRequest}, and
 * {@link HttpServletResponse}.</p>
* <p>
 * This test class deployment represents the simplest test form for deployment
 * of a {@literal Servlet 3.0} based Filter that takes advantage of
 * annotations.</p>
*
 * @author John Yeary
 * @version 1.0
 * @see HeaderFilterRegistrationIntegrationTest
 */
@RunWith(value = Arquillian.class)
@WarpTest
@RunAsClient
public class HeaderFilterIntegrationTest {
 
    @ArquillianResource
    private URL contextPath;
    @Drone
    private WebDriver webdriver;
 
    /**
     * Default constructor.
     */
    public HeaderFilterIntegrationTest() {
    }
 
    /**
     * Creates a {@link WebArchive} for auto-deployment in Arquillian.
     *
     * @return an Web ARchive (war) file representing the filter to be tested.
     */
    @Deployment
    public static WebArchive createDeployment() {
        WebArchive war = ShrinkWrap.create(WebArchive.class)
                .addClass(HeaderFilter.class);
        System.out.println(war.toString(true));
        return war;
    }
 
    /**
     * Executes the doFilter() method of the filter and checks the expected
     * results.
     */
    @Test
    public void testDoFilter() {
        Warp.initiate(new Activity() {
 
            @Override
            public void perform() {
                System.out.println("TEST URL: " + contextPath.toString());
                webdriver.navigate().to(contextPath);
            }
        }).inspect(new Inspection() {
            private static final long serialVersionUID = 1489207995240215531L;
            @ArquillianResource
            HttpServletRequest request;
            @ArquillianResource
            HttpServletResponse response;
 
            @BeforeServlet
            public void before() {
                List attributeNames = Collections.list(request.getAttributeNames());
                System.out.println("Attributes: " + Arrays.toString(attributeNames.toArray()));
                String attribute = (String) request.getAttribute("X-ATTRIBUTE");
                assertEquals("Experimental Attribute", attribute);
            }
 
            @AfterServlet
            public void after() {
                System.out.println("Headers: " + Arrays.toString(response.getHeaderNames().toArray()));
                assertEquals("Experimental Header", response.getHeader("X-HEADER"));
            }
        });
    }
}

HeaderFilterRegistrationIntegrationDisabledTest.java

package com.bluelotussoftware.example.filter;
 
import java.net.URL;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jboss.arquillian.container.test.api.Deployment;
import org.jboss.arquillian.container.test.api.RunAsClient;
import org.jboss.arquillian.drone.api.annotation.Drone;
import org.jboss.arquillian.junit.Arquillian;
import org.jboss.arquillian.test.api.ArquillianResource;
import org.jboss.arquillian.warp.Activity;
import org.jboss.arquillian.warp.Inspection;
import org.jboss.arquillian.warp.Warp;
import org.jboss.arquillian.warp.WarpTest;
import org.jboss.arquillian.warp.servlet.AfterServlet;
import org.jboss.arquillian.warp.servlet.BeforeServlet;
import org.jboss.shrinkwrap.api.ShrinkWrap;
import org.jboss.shrinkwrap.api.asset.Asset;
import org.jboss.shrinkwrap.api.asset.StringAsset;
import org.jboss.shrinkwrap.api.spec.WebArchive;
import org.jboss.shrinkwrap.descriptor.api.Descriptors;
import org.jboss.shrinkwrap.descriptor.api.webapp30.WebAppDescriptor;
import org.jboss.shrinkwrap.descriptor.api.webcommon30.WebAppVersionType;
import org.junit.Test;
import static org.junit.Assert.*;
import org.junit.runner.RunWith;
import org.openqa.selenium.WebDriver;
 
/**
 * Checks the {@link HeaderFilter} initialization parameter set the disabled to
 * confirm that headers are not added to the {@link HttpServletRequest}, or
 * {@link HttpServletResponse}.
 *
 * @author John Yeary
 * @version 1.0
 * @see HeaderFilterDisabledIntegrationTest
 */
@RunWith(Arquillian.class)
@WarpTest
@RunAsClient
public class HeaderFilterRegistrationIntegrationDisabledTest {
 
    public static final String URL_PATTERN = "/*";
    public static final String PARAM_NAME = "enabled";
    public static final String PARAM_VALUE = "false";
    @ArquillianResource
    private URL contextPath;
    @Drone
    private WebDriver webdriver;
 
    /**
     * Default constructor.
     */
    public HeaderFilterRegistrationIntegrationDisabledTest() {
    }
 
    /**
     * Creates a {@link WebArchive} for auto-deployment in Arquillian.
     *
     * @return an Web ARchive (war) file representing the filter to be tested.
     */
    @Deployment
    public static WebArchive createDeployment() {
        WebArchive war = ShrinkWrap.create(WebArchive.class)
                .addClass(HeaderFilter.class)
                .setWebXML(generateWebXMLAsset());
        System.out.println(war.toString(true));
        return war;
    }
 
    /**
     * This builder constructs a web.xml descriptor for a filter and converts it
     * to a {@link StringAsset}.
     *
     * @return the web.xml represented as an {@link Asset}.
     */
    private static Asset generateWebXMLAsset() {
        WebAppDescriptor wad = Descriptors.create(WebAppDescriptor.class);
 
        wad.version(WebAppVersionType._3_0)
                .createFilter()
                .filterName(HeaderFilter.class.getSimpleName())
                .filterClass(HeaderFilter.class.getName())
                .createInitParam()
                .paramName(PARAM_NAME)
                .paramValue(PARAM_VALUE)
                .up()
                .up()
                .createFilterMapping()
                .filterName(HeaderFilter.class.getSimpleName())
                .urlPattern(URL_PATTERN)
                .up();
        System.out.println(wad.exportAsString());
        return new StringAsset(wad.exportAsString());
    }
 
    /**
     * Executes the doFilter() method of the filter and checks the expected
     * results.
     */
    @Test
    public void testDoFilter() {
        Warp.initiate(new Activity() {
 
            @Override
            public void perform() {
                System.out.println("TEST URL: " + contextPath.toString());
                webdriver.navigate().to(contextPath);
            }
        }).inspect(new Inspection() {
            private static final long serialVersionUID = 1489207995240215531L;
            @ArquillianResource
            HttpServletRequest request;
            @ArquillianResource
            HttpServletResponse response;
 
            @BeforeServlet
            public void before() {
                List attributeNames = Collections.list(request.getAttributeNames());
                System.out.println("Attributes: " + Arrays.toString(attributeNames.toArray()));
                assertNull(request.getAttribute("X-ATTRIBUTE"));
            }
 
            @AfterServlet
            public void after() {
                System.out.println("Headers: " + Arrays.toString(response.getHeaderNames().toArray()));
                assertNull(response.getHeader("X-HEADER"));
            }
        });
    }
}