private JavadocOptionFileWriterContext writerContextMock = Mock()
    private final String optionName = "testOption"

    private MultilineStringsJavadocOptionFileOption linksOption

    def setup() {
        linksOption = new MultilineStringsJavadocOptionFileOption(optionName, new ArrayList<>())
    }

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

    }

    public JavadocOptionFileOption<List<String>> addMultilineStringsOption(String option) {
        return addOption(new MultilineStringsJavadocOptionFileOption(option, new ArrayList<>()));
    }

    public JavadocOptionFileOption<Boolean> addBooleanOption(String option) {
        return addBooleanOption(option, false);
    }

Class <org.gradle.external.javadoc.internal.MultilineStringsJavadocOptionFileOption> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (MultilineStringsJavadocOptionFileOption.java:0)