when:
        snapshot(tmpDir.createFile("regular.txt"))

        then:
        1 * statisticsCollector.recordVisitHierarchy()

        then:
        1 * statisticsCollector.recordVisitFile()
        0 * _
    }

    def "can visit empty directory"() {
        when:
        snapshot(tmpDir.createDir("dir"))

        then:
        1 * statisticsCollector.recordVisitHierarchy()

            hierarchyCount.incrementAndGet();
        }

        public void recordVisitDirectory() {
            directoryCount.incrementAndGet();
        }

        public void recordVisitFile() {
            fileCount.incrementAndGet();
        }

        public void recordVisitFileFailed() {
            failedFileCount.incrementAndGet();
        }