assert expectedModules == seenModules
            } else {
                assert seenModules.containsAll(modules)
            }
        }
    }

    void hasNoModules() {
        hasModules([])
    }

    void assertXmlContents(String expected) {
        def actualContents = TextUtil.normaliseLineSeparators(verificationFile.text)

        then:
        assertMetadataIsMissing()

        when:
        writeVerificationMetadata()
        succeeds ':help'

        then:
        assertMetadataExists()
        hasNoModules()
    }

    def "warns if trying to generate with an unknown checksum type (#checksums)"() {
        when:
        writeVerificationMetadata(checksums)
        succeeds ':help'

        then: