(255, &[0x80, 0x7F]),
      (256, &[0x81, 0x00]),
      (16383, &[0xFE, 0x7F]),
      (16384, &[0xFF, 0x00]),
      (16511, &[0xFF, 0x7F]),
      (65535, &[0x82, 0xFE, 0x7F]),
      (1 << 32, &[0x8E, 0xFE, 0xFE, 0xFF, 0x00]),
    ];

    for (n, encoding) in TEST_VECTORS {
      let actual = encode(*n);
      assert_eq!(actual, *encoding);
      let (actual, length) = decode(encoding).unwrap();
      assert_eq!(actual, *n);
      assert_eq!(length, encoding.len());
    }
  }

  #[test]
  fn truncated_varint_returns_error() {
    assert_eq!(decode(&[128]), Err(Error::Varint));
  }
}