arbitrary_support.rs

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use crate::{std::convert::TryInto, Builder, Uuid};

use arbitrary::{Arbitrary, Unstructured};

impl Arbitrary<'_> for Uuid {

    fn arbitrary(u: &mut Unstructured<'_>) -> arbitrary::Result<Self> {

        let b = u

            .bytes(16)?

            .try_into()

            .map_err(|_| arbitrary::Error::NotEnoughData)?;

        Ok(Builder::from_random_bytes(b).into_uuid())

    fn size_hint(depth: usize) -> (usize, Option<usize>) {

        (16, Some(16))

#[cfg(test)]

mod tests {

    use super::*;

    use crate::{Variant, Version};

    #[test]

    fn test_arbitrary() {

        let mut bytes = Unstructured::new(&[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]);

        let uuid = Uuid::arbitrary(&mut bytes).unwrap();

        assert_eq!(Some(Version::Random), uuid.get_version());

        assert_eq!(Variant::RFC4122, uuid.get_variant());

    #[test]

    fn test_arbitrary_empty() {

        let mut bytes = Unstructured::new(&[]);

        // Ensure we don't panic when building an arbitrary `Uuid`

        let uuid = Uuid::arbitrary(&mut bytes);

        assert!(uuid.is_err());