File touchfile = getTouchfile(metadata, file);

        String key = getMetadataKey(repository, file);

        return readLastUpdated(touchfile, key);
    }

    @Override
    public String getError(Artifact artifact, ArtifactRepository repository) {
        File touchFile = getTouchfile(artifact);
        return getError(touchFile, getRepositoryKey(repository));
    }

        File file = new File(localRepository.getBasedir(), localRepository.pathOf(a));
        file.delete();
        a.setFile(file);

        File touchFile = updateCheckManager.getTouchfile(a);
        touchFile.delete();

        assertTrue(updateCheckManager.isUpdateRequired(a, remoteRepository));

        file.getParentFile().mkdirs();
        file.createNewFile();

    }

    private
    fun touchFile(path: Path) {
        Files.createDirectories(path.parent)
        Files.write(path, byteArrayOf())
    }

    private
    fun someClasses(): Sequence<Path> {
        val directory = projectDir.resolve("classes")

        touchFile(directory.resolve("com/acme/Foo.class"))
        touchFile(directory.resolve("com/acme/internal/FooInternal.class"))