gradleManifest.getAttributes().put('Looong-Name-Of-Manifest-Entry', attributeValue)

        when:
        gradleManifest.writeTo('manifestFile')

        then:
        def javaManifest = readJavaManifest(manifestFile)
        javaManifest.mainAttributes.getValue('Looong-Name-Of-Manifest-Entry') == attributeValue
    }

        // Note that there's no need to cover this case with merge read charsets
        // other than UTF-8 because it's not supported by the JVM.
        given:
        def attributeNameMerged = 'Looong-Name-Of-Manifest-Entry'
        def attributeNameWritten = 'Another-Looooooong-Name-Entry'
        // Means 'long russian text'
        def attributeValue = 'com.acme.example.pack.**, длинный.текст.на.русском.языке.**'