}

        @Override
        public boolean onJavadocTag(String tag, String value) {
            listener.warning(String.format("Unsupported Javadoc tag '%s'", tag));
            Element element = document.createElement("UNHANDLED-TAG");
            element.appendChild(document.createTextNode(String.format("{@%s %s}", tag, value)));
            nodes.appendChild(element);
            return true;
        }
    }

        then:
        format(result.docbook) == '''<para><UNHANDLED-ELEMENT>&lt;unknown&gt;text&lt;/unknown&gt;</UNHANDLED-ELEMENT><UNHANDLED-ELEMENT>&lt;inheritdoc&gt;<UNHANDLED-TAG>{@unknown text}</UNHANDLED-TAG><UNHANDLED-TAG>{@p text}</UNHANDLED-TAG><UNHANDLED-TAG>{@ unknown}</UNHANDLED-TAG>&lt;/inheritdoc&gt;</UNHANDLED-ELEMENT></para>'''
    }

    def handlesMissingStartTags() {
        _ * classMetaData.rawCommentText >> 'a para</b></p>'

            // Note there is an issue: https://github.com/spockframework/spock/issues/1288
            // JUnit Platform `includeTags` works before Spock engine, thus excludes all spock tests.
            // As a workaround, we tag all non-spock integration tests and use `includeTags(none() | Flaky)` here.
            (options as JUnitPlatformOptions).includeTags("none() | org.gradle.test.fixtures.Flaky")

                ?: versionNotFound,
            nodeName(node, this, sourceFile)
        )

    private
    fun findVersionFromJavadoc(javadoc: Javadoc): String? =
        javadoc.blockTags
            .find { tag -> tag.tagName == "since" }
            ?.content?.elements?.find { description -> description is JavadocSnippet }
            ?.toText()

    private