assertEquals("lib/tools.jar", config0.getChild("toolsJar").getValue());
            assertEquals(2, config0.getChildCount());
            Xpp3Dom config1 = (Xpp3Dom) jdks.getToolchains().get(1).getConfiguration();
            assertEquals(2, config1.getChildCount());
            assertEquals("lib/classes.jar", config1.getChild("toolsJar").getValue());
            assertEquals(2, jdksExtend.getToolchains().size());

        for (final String a : getAttributeNames()) {
            buf.append(' ').append(a).append("=\"").append(getAttribute(a)).append('"');
        }
        if (getChildCount() > 0) {
            buf.append('>');
            for (int i = 0, size = getChildCount(); i < size; i++) {
                buf.append(getChild(i));
            }
            buf.append("</").append(getName()).append('>');
        } else if (null != getValue()) {

                } else {
                    result = evaluator.evaluate(value);
                }
            }
            if (null == result && configuration.getChildCount() == 0) {
                value = configuration.getAttribute("default-value");
                if (null != value && !value.isEmpty()) {
                    if (evaluator instanceof TypeAwareExpressionEvaluator) {

        if (config == null) {
            return false;
        }

        // there are sub items ... so configuration is declared
        if (config.getChildCount() > 0) {
            return true;
        }

        String strValue = config.getValue();

        if (strValue == null || strValue.isEmpty()) {
            return false;
        }

        assertEquals(1, md.getRequirements().size());
        assertEquals(1, md.getParameters().size());

        assertNotNull(md.getMojoConfiguration());
        assertEquals(1, md.getMojoConfiguration().getChildCount());

        PlexusConfiguration pc = md.getMojoConfiguration().getChild(0);

        assertEquals("${jar.finalName}", pc.getValue());
        assertEquals("${project.build.finalName}", pc.getAttribute("default-value"));

    }

    private void checkUnknownMojoConfigurationParameters(MojoExecution mojoExecution) {
        if (mojoExecution.getConfiguration() == null
                || mojoExecution.getConfiguration().getChildCount() == 0) {
            return;
        }

        MojoDescriptor mojoDescriptor = mojoExecution.getMojoDescriptor();

        // in first step get parameter names of current goal