}

    def writeNullValue() {
        when:
        linksOption.writeCollectionValue(writerContextMock)

        then:
        0 * _._
    }

    def writeNonNullValue() {
        final String extDocUrl = "extDocUrl"
        linksOption.getValue().add(extDocUrl)

        when:
        linksOption.writeCollectionValue(writerContextMock)

        then:

    }

    @Override
    public void write(JavadocOptionFileWriterContext writerContext) throws IOException {
        if (value != null && !value.isEmpty()) {
            writeCollectionValue(writerContext);
        }
    }

    protected abstract void writeCollectionValue(JavadocOptionFileWriterContext writerContext) throws IOException;

    public StringsJavadocOptionFileOption(String option, List<String> value, String joinBy) {
        super(option, value, joinBy);
    }

    @Override
    public void writeCollectionValue(JavadocOptionFileWriterContext writerContext) throws IOException {
        writerContext.writeValuesOption(option, value, joinBy);
    }

    @Override
    public StringsJavadocOptionFileOption duplicate() {

            copyValues.add(Lists.newArrayList(occurrence));
        }
        return new MultilineMultiValueJavadocOptionFileOption(option, copyValues, joinBy);
    }

    @Override
    protected void writeCollectionValue(JavadocOptionFileWriterContext writerContext) throws IOException {
        for (List<String> occurrence : getValue()) {
            writerContext.writeOption(option);
            for (String value : occurrence) {

    public PathJavadocOptionFileOption(String option, List<File> value, String joinBy) {
        super(option, value, joinBy);
    }

    @Override
    public void writeCollectionValue(JavadocOptionFileWriterContext writerContext) throws IOException {
        writerContext.writePathOption(option, value, joinBy);
    }

    @Override
    public PathJavadocOptionFileOption duplicate() {

    public MultilineStringsJavadocOptionFileOption(String option, List<String> value) {
        super(option, value, JOIN_BY);
    }

    @Override
    public void writeCollectionValue(JavadocOptionFileWriterContext writerContext) throws IOException {
        if (value != null && !value.isEmpty()) {
            writerContext.writeMultilineValuesOption(option, value);
        }
    }