}

    private Element getSection(String title) {
        def sections = classSection.section.findAll {
            it.title[0] && it.title[0].text().trim() == title
        }
        if (sections.size() < 1) {
            throw new RuntimeException("Docbook content for $className does not contain a '$title' section.")
        }
        return sections[0]
    }

    Element getDescription() {

            doc.interfaces << superType
            builder.build(doc)
            return doc
        }

        then:
        doc.classProperties.size() == 3

        def prop = doc.classProperties[0]
        prop.name == 'a'
        prop.additionalValues.size() == 3
        format(prop.additionalValues[0].title) == 'inherited'
        format(prop.additionalValues[0].value) == 'specific1'

        def parent = sibling.parentNode
        def next = sibling.nextSibling
        builder.elements.each { element ->
            parent.insertBefore(element, next)
        }
        return builder.elements.size() == 1 ? builder.elements[0] : builder.elements
    }

            doc
        }

        then:
        doc.classProperties.size() == 2
        doc.classProperties[0].name == 'block'
        doc.classProperties[1].name == 'listBlock'

        doc.classMethods.size() == 3

        doc.classBlocks.size() == 2
        doc.classBlocks[0].name == 'block'
        doc.classBlocks[0].type.signature == 'org.gradle.Type'

                        "acceptation": "@Incubating interface has been removed"
                    }
                ]
            }
        """)

        then:
        changes.acceptedChanges.size() == 1
        def acceptedChange = changes.acceptedChanges.entrySet().iterator().next()
        def change = acceptedChange.key
        change.type == "org.gradle.api.initialization.ConfigurableIncludedBuild"

                classesContainingMethod.add(current)
            } else {
                break
            }
            current = current.getSuperclass()
        }

        for (int i = classesContainingMethod.size() - 1; i > 0; --i) {
            current = classesContainingMethod.get(i)
            if (!isInternal(current)) {
                // there's another public super class which contains target method

            doc.mergeContent()
        }

        then:
        doc.classExtensions.size() == 2

        doc.classExtensions[0].pluginId == 'a'
        doc.classExtensions[0].extensionClasses == [n1: extensionA1, n2: extensionA2]
        doc.classExtensions[0].extensionProperties.size() == 2
        doc.classExtensions[0].extensionBlocks.size() == 2

        doc.classExtensions[1].pluginId == 'b'

            List<Boolean> newParametersNullability = parametersNullabilityOf(newBehavior)

            for (int idx = 0; idx < oldParametersNullability.size(); idx++) {
                def oldNullability = oldParametersNullability[idx]
                def newNullability = newParametersNullability[idx]
                if (oldNullability && !newNullability) {

        } finally {
            THREAD_POOL.shutdown()
        }
    }

    static void checkCommit(String commit) {
        List<String> parentCommits = parentCommitsOf(commit)
        if (parentCommits.size() != 2) {
            println("$commit is not a merge commit we're looking for. Parents: $parentCommits")
            return
        }

        // The correct state we are looking for is:
        // 1. It's a merge commit.