}

    List<TestFile> listCacheFiles() {
        cacheDir.listFiles().findAll { it.name ==~ /\p{XDigit}{${Hashing.defaultFunction().hexDigits}}/ }.sort()
    }

    void deleteCacheEntry(String cacheKey) {
        def entry = getTestFileCacheEntry(cacheKey)
        if (entry.file.exists()) {
            entry.file.deleteDir()
        }
    }

    boolean hasCacheEntry(String cacheKey) {

        remoteCache.hasCacheEntry(cacheKey)

        when:
        def cacheEntry = remoteCache.getCacheEntry(cacheKey)
        cacheEntry.text = "corrupt"
        localCache.deleteCacheEntry(cacheKey)

        then:
        fails("clean", "customTask")
        failureHasCause(~/Failed to load cache entry $CACHE_KEY_PATTERN for task ':customTask': Could not load from remote cache: Not in GZIP format/)

        def artifactFileCopy = file("artifact")
        // move it out of the local for us to use
        buildCache.getCacheEntry(initialPackOp.details.cacheKey.toString()).copyBytesTo(artifactFileCopy)
        buildCache.deleteCacheEntry(initialPackOp.details.cacheKey.toString())
        assert !buildCache.hasCacheEntry(initialPackOp.details.cacheKey.toString())

        when:
        settingsFile.text = ""