def exitHandler = Mock(Runnable)

    def "can work when empty"() {
        def parser = new RelativePathParser("tree-some/")

        expect:
        parser.root

        when:
        parser.exitToRoot(exitHandler)
        then:
        0 * _
    }

    def "can exit when moved to different root"() {
        def parser = new RelativePathParser("tree-some/")

        when:

    }

    public boolean isRoot() {
        return directoryNames.isEmpty() && currentPath.length() == rootLength;
    }

    public void exitToRoot(Runnable exitDirectoryHandler) {
        while (true) {
            if (exitDirectory(exitDirectoryHandler)) {
                break;
            }
        }
    }

                RegularFileSnapshot fileSnapshot = unpackFile(input, entry, file, parser.getName());
                builder.visitLeafElement(fileSnapshot);
            }
        }

        parser.exitToRoot(builder::leaveDirectory);
        builder.leaveDirectory();

        snapshots.put(treeName, builder.getResult());
        return entry;
    }

    /**