<dependency>
    <groupId>com.agiliumlabs.arquillian</groupId>
    <artifactId>arquillian-gwt-dev-mode</artifactId>
    <version>1.0.1.Final</version>
    <scope>test</scope>
</dependency>

<?xml version="1.0" encoding="UTF-8"?>
<arquillian xmlns="http://jboss.org/schema/arquillian" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://jboss.org/schema/arquillian http://jboss.org/schema/arquillian/arquillian_1_0.xsd">
    <container qualifier="gwt" default="true">
    	<configuration>
    		<property name="modules">package.Module1,package.Module2</property>
    		<property name="startPage">App.html</property>
    	</configuration>
    </container>
</arquillian>

@RunAsClient
@RunWith(Arquillian.class)
public class YourTest {

    @ArquillianResource
    private GwtApplicationContext gwtApplication;

    @Deployment
    public static GwtArchive buildDeployment() {
        GwtArchive.create().addMavenDependencies().
                addPackages(true, "your.app.package").
				addAsWebResource(new File("src/main/webapp/App.html"));   
	}

  	/* The rest of your test goes here */