rust iterator equality stuff.rs

#[cfg(test)]
use std::fmt::Debug;
#[cfg(test)]
use std::cmp::PartialEq;

#[cfg(test)]
pub fn assert_iter_eq<T: Iterator, U: ExactSizeIterator>(a: T, b: U)
where
    T: ExactSizeIterator,
    <T as Iterator>::Item: Debug + PartialEq,
    U: ExactSizeIterator + Iterator<Item = <T as Iterator>::Item>,
{
    assert_eq!(a.len(), b.len());
    for (left, right) in a.zip(b) {
        assert_eq!(left, right);
    }
}

#[cfg(test)]
pub fn assert_iter_ne<T: ExactSizeIterator, U: ExactSizeIterator>(a: T, b: U)
where
    T: ExactSizeIterator,
    <T as Iterator>::Item: Debug + PartialEq,
    U: ExactSizeIterator + Iterator<Item = <T as Iterator>::Item>
{
    if a.len() != b.len() {
        return;
    }
    let mut same_count = 0;
    let a_len = a.len();
    for (left, right) in a.zip(b) {
        if left == right {
            same_count += 1;
        }
    }
    assert!(same_count < a_len);
}