unit testing EJBs with Maven 2 and Glassfish 3

I've been trying to set my application up so that I can unit test it's EJBs all day but I can't seem to get past what seems like a really simple problem.

I have a standard Maven web application set up in NetBeans 6.9. I've automatically generated a unit test for one of the EJBs but whenever I go to run it I get the error message:

Testcase: initializationError(com.example.ExampleTest): Caused an ERROR
Absent Code attribute in method that is not native or abstract in class file javax/ejb/embeddable/EJBContainer
java.lang.ClassFormatError: Absent Code attribute in method that is not native or abstract in class file javax/ejb/embeddable/EJBContainer
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)

I've researched this one to death and I'm pretty sure the problem is that my pom currently points to a jar which contains only the API

<dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>6.0</version>
            <scope>provided</scope>
        </dependency>

Not and implementation that can be used for running the tests. I'm pretty sure the test is failing in the method marked with @BeforeClass when it tries to execute

container = EJBContainer.createEJBContainer();

The standard recommended solution is to add the glassfish-embedded-all artifact as the first project dependency with test scope

<dependency>
            <groupId>org.glassfish.extras</groupId>
            <artifactId>glassfish-embedded-all</artifactId>
            <version>3.0.1</version>