private MockFile findFile(Path path) {
      for (MockFile file: files) {
        if (file.path.equals(path)) {
          return file;
        }
      }
      for (MockFile file: globalFiles) {
        if (file.path.equals(path)) {
          return file;
        }
      }
      return null;
    }
WARNING: detele(Path...) don't actually delete
ql/src/test/org/apache/hadoop/hive/ql/io/orc/TestInputOutputFormat.java