class ActorsPackageDescriptionImpl implements ActorsPackageDescription {

    @NotNull
    @Override
    public String getBuilderClassName() {
        assert mElement != null;
        ActorsPackage annotation = mElement.getAnnotation(ActorsPackage.class);
        return annotation.builderName();
    }

}

class ActorsPackageDescriptionImplTest {

    private static final String PACKAGE_NAME;
    private static final String BUILDER_CLASS_NAME;
    @Mock
    private PackageElement mElement;
    @Mock
    private ActorsPackage mAnnotation;

    @Test
    public void getBuilderClassName_sameObject_provideConfiguredAnnotation() {

        ActorsPackageDescriptionImpl impl = new ActorsPackageDescriptionImpl(mElement);
        Assert.assertEquals(BUILDER_CLASS_NAME, impl.getBuilderClassName());
    }

}