clearcheck 0.0.2

Elegant and extensible assertions in rust.
Documentation 
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use std::fmt::Debug;

use crate::matchers::{Matcher, MatcherResult};

/// DuplicateContentMatcher offers a flexible way to assert whether a collection contains any duplicates.
///
/// clearcheck implements DuplicateContentMatcher for collection types including vector, arrays and reference to slices.
///
/// # Example
///```
/// use clearcheck::matchers::collection::duplicate::contain_duplicates;
/// use clearcheck::matchers::Matcher;
///
/// let matcher = contain_duplicates();
/// let collection = vec!["junit", "clearcheck", "junit"];
///
/// assert!(matcher.test(&collection).passed());
/// ```
pub struct DuplicateContentMatcher;

impl DuplicateContentMatcher {
    fn test<T: Eq + Debug>(&self, collection: &[T]) -> MatcherResult {
        let mut unique = Vec::new();
        collection.iter().for_each(|source| {
            if !unique.contains(&source) {
                unique.push(source)
            }
        });

        MatcherResult::formatted(
            unique.len() != collection.len(),
            format!("{:?} should have duplicates", collection),
            format!("{:?} should not have duplicates", collection),
        )
    }
}

impl<T: Eq + Debug> Matcher<Vec<T>> for DuplicateContentMatcher {
    fn test(&self, collection: &Vec<T>) -> MatcherResult {
        self.test(collection)
    }
}

impl<T: Eq + Debug, const N: usize> Matcher<[T; N]> for DuplicateContentMatcher {
    fn test(&self, collection: &[T; N]) -> MatcherResult {
        self.test(collection as &[T])
    }
}

impl<T: Eq + Debug> Matcher<&[T]> for DuplicateContentMatcher {
    fn test(&self, collection: &&[T]) -> MatcherResult {
        self.test(collection)
    }
}

/// Creates a DuplicateContentMatcher that asserts whether the underlying collection contains any duplicates.
pub fn contain_duplicates() -> DuplicateContentMatcher {
    DuplicateContentMatcher
}

#[cfg(test)]
mod tests {
    use crate::assertions::bool::TrueFalseAssertion;
    use crate::matchers::collection::duplicate::contain_duplicates;

    #[test]
    fn should_contains_duplicates() {
        let matcher = contain_duplicates();
        let collection = vec!["junit", "assert4j", "junit"];
        matcher.test(&collection).passed.should_be_true();
    }

    #[test]
    #[should_panic]
    fn should_contains_duplicates_but_it_did_not() {
        let matcher = contain_duplicates();
        let collection = vec!["junit", "assert4j", ""];
        matcher.test(&collection).passed.should_be_true();
    }
}