fn read_elements_from()

in math/src/field/f128/tests.rs [196:233]

• 32 lines of code
• 1 McCabe index (conditional complexity)

fn read_elements_from() {
    let bytes: Vec<u8> = vec![
        1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    ];
    let expected = vec![
        BaseElement::new(1),
        BaseElement::new(2),
        BaseElement::new(3),
        BaseElement::new(4),
    ];

    // fill whole target
    let mut reader = SliceReader::new(&bytes[..64]);
    let result = BaseElement::read_batch_from(&mut reader, 4);
    assert!(result.is_ok());
    assert_eq!(expected, result.unwrap());
    assert_eq!(false, reader.has_more_bytes());

    // partial number of elements
    let mut reader = SliceReader::new(&bytes[..65]);
    let result = BaseElement::read_batch_from(&mut reader, 4);
    assert!(result.is_ok());
    assert_eq!(expected, result.unwrap());
    assert_eq!(true, reader.has_more_bytes());

    // invalid element
    let mut reader = SliceReader::new(&bytes[16..]);
    let result = BaseElement::read_batch_from(&mut reader, 4);
    assert!(result.is_err());
    match result {
        Err(err) => {
            assert!(matches!(err, DeserializationError::InvalidValue(_)));
        }
        _ => (),
    }
}