cbor2 0.5.0

A serde implementation of CBOR (RFC 8949) with a dynamic Value type and tag support.
Documentation 
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//! Exhaustive tests for `Value` accessors, conversions and `Integer`.

use cbor2::value::Integer;
use cbor2::Value;

#[test]
fn accessors_match_their_variant() {
    let mut v = Value::Integer(7.into());
    assert!(v.is_integer());
    assert_eq!(v.as_integer(), Some(7.into()));
    assert_eq!(v.clone().into_integer(), Ok(7.into()));
    assert!(!v.is_bytes() && !v.is_float() && !v.is_text());
    assert!(!v.is_bool() && !v.is_null() && !v.is_tag());
    assert!(!v.is_array() && !v.is_map());
    assert!(v.as_bytes().is_none() && v.as_bytes_mut().is_none());
    assert!(v.as_float().is_none() && v.as_text().is_none());
    assert!(v.as_text_mut().is_none() && v.as_bool().is_none());
    assert!(v.as_tag().is_none() && v.as_tag_mut().is_none());
    assert!(v.as_array().is_none() && v.as_array_mut().is_none());
    assert!(v.as_map().is_none() && v.as_map_mut().is_none());

    let mut v = Value::Bytes(vec![1]);
    assert!(v.is_bytes());
    assert_eq!(v.as_bytes(), Some(&vec![1]));
    v.as_bytes_mut().unwrap().push(2);
    assert_eq!(v.clone().into_bytes(), Ok(vec![1, 2]));
    assert!(v.as_integer().is_none() && !v.is_integer());

    let v = Value::Float(1.5);
    assert!(v.is_float());
    assert_eq!(v.as_float(), Some(1.5));
    assert_eq!(v.clone().into_float(), Ok(1.5));

    let mut v = Value::Text("a".into());
    assert!(v.is_text());
    assert_eq!(v.as_text(), Some("a"));
    v.as_text_mut().unwrap().push('b');
    assert_eq!(v.clone().into_text(), Ok("ab".into()));

    let v = Value::Bool(true);
    assert!(v.is_bool());
    assert_eq!(v.as_bool(), Some(true));
    assert_eq!(v.clone().into_bool(), Ok(true));

    assert!(Value::Null.is_null());
    assert!(!Value::Bool(false).is_null());

    let mut v = Value::Tag(7, Box::new(Value::Null));
    assert!(v.is_tag());
    assert_eq!(v.as_tag(), Some((7, &Value::Null)));
    {
        let (tag, inner) = v.as_tag_mut().unwrap();
        *tag = 8;
        *inner = Value::Bool(true);
    }
    assert_eq!(v.clone().into_tag(), Ok((8, Box::new(Value::Bool(true)))));

    let mut v = Value::Array(vec![Value::Null]);
    assert!(v.is_array());
    assert_eq!(v.as_array().unwrap().len(), 1);
    v.as_array_mut().unwrap().clear();
    assert_eq!(v.clone().into_array(), Ok(vec![]));

    let mut v = Value::Map(vec![(Value::Null, Value::Null)]);
    assert!(v.is_map());
    assert_eq!(v.as_map().unwrap().len(), 1);
    v.as_map_mut().unwrap().clear();
    assert_eq!(v.clone().into_map(), Ok(vec![]));
}

#[test]
fn into_conversions_return_self_on_mismatch() {
    let v = Value::Null;
    assert_eq!(v.clone().into_integer(), Err(Value::Null));
    assert_eq!(v.clone().into_bytes(), Err(Value::Null));
    assert_eq!(v.clone().into_float(), Err(Value::Null));
    assert_eq!(v.clone().into_text(), Err(Value::Null));
    assert_eq!(v.clone().into_bool(), Err(Value::Null));
    assert_eq!(v.clone().into_tag(), Err(Value::Null));
    assert_eq!(v.clone().into_array(), Err(Value::Null));
    assert_eq!(v.into_map(), Err(Value::Null));
}

#[test]
fn from_impls() {
    assert_eq!(Value::from(Integer::from(3)), Value::Integer(3.into()));
    assert_eq!(Value::from(3u8), Value::Integer(3.into()));
    assert_eq!(Value::from(3u16), Value::Integer(3.into()));
    assert_eq!(Value::from(3u32), Value::Integer(3.into()));
    assert_eq!(Value::from(3u64), Value::Integer(3.into()));
    assert_eq!(Value::from(-3i8), Value::Integer((-3).into()));
    assert_eq!(Value::from(-3i16), Value::Integer((-3).into()));
    assert_eq!(Value::from(-3i32), Value::Integer((-3).into()));
    assert_eq!(Value::from(-3i64), Value::Integer((-3).into()));

    assert_eq!(Value::from(vec![1u8]), Value::Bytes(vec![1]));
    assert_eq!(Value::from(&b"ab"[..]), Value::Bytes(b"ab".to_vec()));

    assert_eq!(Value::from(0.5f64), Value::Float(0.5));
    assert_eq!(Value::from(0.5f32), Value::Float(0.5));

    assert_eq!(Value::from(String::from("x")), Value::Text("x".into()));
    assert_eq!(Value::from("x"), Value::Text("x".into()));
    assert_eq!(Value::from('æ°´'), Value::Text("æ°´".into()));

    assert_eq!(Value::from(true), Value::Bool(true));

    let items = [Value::Null];
    assert_eq!(Value::from(&items[..]), Value::Array(vec![Value::Null]));
    assert_eq!(
        Value::from(vec![Value::Null]),
        Value::Array(vec![Value::Null])
    );

    let pairs = [(Value::Null, Value::Null)];
    assert_eq!(
        Value::from(&pairs[..]),
        Value::Map(vec![(Value::Null, Value::Null)])
    );
    assert_eq!(
        Value::from(pairs.to_vec()),
        Value::Map(vec![(Value::Null, Value::Null)])
    );
}

#[test]
fn from_128_bit_boundaries() {
    // In range: plain integers.
    assert_eq!(
        Value::from(u64::MAX as u128),
        Value::Integer(u64::MAX.into())
    );
    assert_eq!(
        Value::from(-(u64::MAX as i128) - 1),
        Value::Integer(Integer::try_from(-(u64::MAX as i128) - 1).unwrap())
    );

    // Out of range: bignum tags with stripped payloads.
    let v = Value::from(u64::MAX as u128 + 1);
    assert_eq!(v.as_tag().unwrap().0, 2);
    assert_eq!(v.as_tag().unwrap().1.as_bytes().unwrap().len(), 9);

    let v = Value::from(-(u64::MAX as i128) - 2);
    assert_eq!(v.as_tag().unwrap().0, 3);
    assert_eq!(v.as_tag().unwrap().1.as_bytes().unwrap().len(), 9);
}

#[test]
fn integer_conversions() {
    // From all primitive widths...
    assert_eq!(i128::from(Integer::from(3u8)), 3);
    assert_eq!(i128::from(Integer::from(3u16)), 3);
    assert_eq!(i128::from(Integer::from(3u32)), 3);
    assert_eq!(i128::from(Integer::from(3u64)), 3);
    assert_eq!(i128::from(Integer::from(-3i8)), -3);
    assert_eq!(i128::from(Integer::from(-3i16)), -3);
    assert_eq!(i128::from(Integer::from(-3i32)), -3);
    assert_eq!(i128::from(Integer::from(-3i64)), -3);
    assert_eq!(i128::from(Integer::from(3usize)), 3);
    assert_eq!(i128::from(Integer::from(-3isize)), -3);

    // ...and back, with range checks.
    let big = Integer::from(u64::MAX);
    assert_eq!(u64::try_from(big), Ok(u64::MAX));
    assert!(u8::try_from(big).is_err());
    assert!(u16::try_from(big).is_err());
    assert!(u32::try_from(big).is_err());
    assert!(i8::try_from(big).is_err());
    assert!(i16::try_from(big).is_err());
    assert!(i32::try_from(big).is_err());
    assert!(i64::try_from(big).is_err());
    assert!(usize::try_from(Integer::from(1u8)).is_ok());
    assert!(isize::try_from(Integer::from(1u8)).is_ok());

    assert_eq!(u8::try_from(Integer::from(7u8)), Ok(7));
    assert_eq!(u16::try_from(Integer::from(7u8)), Ok(7));
    assert_eq!(u32::try_from(Integer::from(7u8)), Ok(7));
    assert_eq!(i8::try_from(Integer::from(-7i8)), Ok(-7));
    assert_eq!(i16::try_from(Integer::from(-7i8)), Ok(-7));
    assert_eq!(i32::try_from(Integer::from(-7i8)), Ok(-7));
    assert_eq!(i64::try_from(Integer::from(-7i8)), Ok(-7));

    // 128-bit constructors enforce the CBOR integer range.
    assert!(Integer::try_from(-2i128.pow(64)).is_ok());
    assert!(Integer::try_from(-2i128.pow(64) - 1).is_err());
    assert!(Integer::try_from(2u128.pow(64) - 1).is_ok());
    assert!(Integer::try_from(2u128.pow(64)).is_err());
    assert!(Integer::try_from(2i128.pow(64)).is_err());

    // 128-bit extractors.
    assert_eq!(
        u128::try_from(Integer::from(u64::MAX)),
        Ok(u64::MAX as u128)
    );
    assert!(u128::try_from(Integer::from(-1i8)).is_err());
    assert_eq!(
        i128::from(Integer::try_from(-2i128.pow(64)).unwrap()),
        -2i128.pow(64)
    );
}