@Override
    public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
      Objects.requireNonNull(file);
      Files.delete(file);
      return FileVisitResult.CONTINUE;
    }
Test what happens if tagInfoFile does not contain a path, i.e. the value is simply
"image_info.json".
src/test/java/com/spotify/docker/BuildMojoTest.java