public Parameter() {}

    public Parameter(org.apache.maven.api.plugin.descriptor.Parameter p) {
        this.setAlias(p.getAlias());
        this.setName(p.getName());
        this.setRequired(p.isRequired());
        this.setEditable(p.isEditable());
        this.setDescription(p.getDescription());
        this.setExpression(p.getExpression());
        this.setDeprecated(p.getDeprecated());

        this.missingParameters = new HashMap<>();

        if (mojoDescriptor.getParameters() != null) {
            for (Parameter param : mojoDescriptor.getParameters()) {
                if (param.isRequired()) {
                    missingParameters.put(param.getName(), param);
                }
            }
        }
    }

    public Collection<Parameter> getMissingParameters() {

        assertEquals("java.lang.String", mp.getImplementation());
        assertTrue(mp.isEditable(), "Expected " + mp + ".isEditable() to return true");
        assertFalse(mp.isRequired(), "Expected " + mp + ".isRequired() to return false");
        assertEquals("parameter-description", mp.getDescription());
        assertEquals("deprecated-parameter", mp.getDeprecated());

            return;
        }

        List<Parameter> invalidParameters = new ArrayList<>();

        for (Parameter parameter : mojoDescriptor.getParameters()) {
            if (!parameter.isRequired()) {
                continue;
            }

            Object value = null;

            PlexusConfiguration config = configuration.getChild(parameter.getName(), false);
            if (config != null) {