message: Add tests to cover SEEK_CUR and SEEK_END
diff: @@ -45,6 +45,17 @@ fn main() {
  let mut contents = Vec::new();
  file.read_to_end(&mut contents).unwrap();
  assert_eq!(bytes, contents.as_slice());
  + // Test seeking relative to the end of the file.
  + file.seek(SeekFrom::End(-1)).unwrap();
  + let mut contents = Vec::new();
  + file.read_to_end(&mut contents).unwrap();
  + assert_eq!(&bytes[bytes.len() - 1..], contents.as_slice());
  + // Test seeking relative to the current position.
  + file.seek(SeekFrom::Start(5)).unwrap();
  + file.seek(SeekFrom::Current(-3)).unwrap();
  + let mut contents = Vec::new();
  + file.read_to_end(&mut contents).unwrap();
  + assert_eq!(&bytes[2..], contents.as_slice());
  // Test that metadata of an absolute path is correct.
  test_metadata(bytes, &path).unwrap();
  