}
        for (String fileName : relativePaths) {
            assertEquals(expectedCounts.get(fileName).size(), filesByRelativePath.get(fileName).size())
        }
        this
    }

    def hasDescendantsInOrder(String... relativePaths) {
        def expectedOrder = CollectionUtils.toList(relativePaths)
        def actualOrder = CollectionUtils.toList(filesByRelativePath.keySet())
        assertEquals(actualOrder, expectedOrder)