clearcheck 0.0.2

Elegant and extensible assertions in rust.
Documentation 
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use crate::matchers::{Matcher, MatcherResult};

/// CaseMatcher offers a flexible way to assert that a string is either lowercase or uppercase.
///
/// # Example
///```
/// use clearcheck::matchers::Matcher;
/// use clearcheck::matchers::string::case::be_lowercase;
///
/// let matcher = be_lowercase();
/// assert!(matcher.test(&"clearcheck").passed());
/// ```
pub enum CaseMatcher {
    Lower,
    Upper,
}

impl<T> Matcher<T> for CaseMatcher
where T: AsRef<str> + PartialEq
{
    fn test(&self, value: &T) -> MatcherResult {
        match self {
            CaseMatcher::Lower => MatcherResult::formatted(
                value.as_ref() == value.as_ref().to_lowercase(),
                format!("{:?} should be lowercase", value.as_ref()),
                format!("{:?} should not be lowercase", value.as_ref()),
            ),
            CaseMatcher::Upper => MatcherResult::formatted(
                value.as_ref() == value.as_ref().to_uppercase(),
                format!("{:?} should be uppercase", value.as_ref()),
                format!("{:?} should not be uppercase", value.as_ref()),
            ),
        }
    }
}

/// Creates a CaseMatcher that asserts whether a string value is composed of lowercase letters.
pub fn be_lowercase() -> CaseMatcher {
    CaseMatcher::Lower
}

/// Creates a CaseMatcher that asserts whether a string value is composed of uppercase letters.
pub fn be_uppercase() -> CaseMatcher {
    CaseMatcher::Upper
}

#[cfg(test)]
mod tests {
    use crate::assertions::bool::TrueFalseAssertion;
    use crate::matchers::string::case::{be_lowercase, be_uppercase};
    use crate::matchers::Matcher;

    #[test]
    fn should_be_lowercase() {
        let matcher = be_lowercase();
        matcher.test(&"goselect").passed.should_be_true();
    }

    #[test]
    #[should_panic]
    fn should_be_lowercase_but_was_not() {
        let matcher = be_lowercase();
        matcher.test(&"GoSelect").passed.should_be_true();
    }

    #[test]
    fn should_be_uppercase() {
        let matcher = be_uppercase();
        matcher.test(&"GOSELECT").passed.should_be_true();
    }

    #[test]
    #[should_panic]
    fn should_be_uppercase_but_was_not() {
        let matcher = be_uppercase();
        matcher.test(&"GoSelect").passed.should_be_true();
    }
}