* @return paths of all artifacts placed on the classpath
     * @throws DependencyResolutionRequiredException if an artifact file is used, but has not been resolved
     */
    private List<String> getClasspathElements(final Predicate<String> scopeFilter, final boolean includeTestDir)
            throws DependencyResolutionRequiredException {
        final List<String> list = new ArrayList<>(getArtifacts().size() + 2);