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    use std::fmt;

    use crate::{capitalize, transform};

    /// This trait defines an upper camel case conversion.
    ///
    /// In UpperCamelCase, word boundaries are indicated by capital letters,
    /// including the first word.
    ///
    /// ## Example:
    ///
    /// ```rust
    /// use heck::ToUpperCamelCase;
    ///
    /// let sentence = "We are not in the least afraid of ruins.";
    /// assert_eq!(sentence.to_upper_camel_case(), "WeAreNotInTheLeastAfraidOfRuins");
    /// ```
    pub trait ToUpperCamelCase: ToOwned {
        /// Convert this type to upper camel case.
        fn to_upper_camel_case(&self) -> Self::Owned;
    }

    impl ToUpperCamelCase for str {
        fn to_upper_camel_case(&self) -> String {
            AsUpperCamelCase(self).to_string()
        }
    }

    /// ToPascalCase is an alias for ToUpperCamelCase. See ToUpperCamelCase for more
    /// documentation.
    pub trait ToPascalCase: ToOwned {
        /// Convert this type to upper camel case.
        fn to_pascal_case(&self) -> Self::Owned;
    }

    impl<T: ?Sized + ToUpperCamelCase> ToPascalCase for T {
        fn to_pascal_case(&self) -> Self::Owned {
            self.to_upper_camel_case()
        }
    }

    /// This wrapper performs a upper camel case conversion in [`fmt::Display`].
    ///
    /// ## Example:
    ///
    /// ```
    /// use heck::AsUpperCamelCase;
    ///
    /// let sentence = "We are not in the least afraid of ruins.";
    /// assert_eq!(format!("{}", AsUpperCamelCase(sentence)), "WeAreNotInTheLeastAfraidOfRuins");
    /// ```
    pub struct AsUpperCamelCase<T: AsRef<str>>(pub T);

    impl<T: AsRef<str>> fmt::Display for AsUpperCamelCase<T> {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
            transform(self.0.as_ref(), capitalize, |_| Ok(()), f)
        }
    }

    #[cfg(test)]
    mod tests {
        use super::ToUpperCamelCase;

        macro_rules! t {
            ($t:ident : $s1:expr => $s2:expr) => {
                #[test]
                fn $t() {
                    assert_eq!($s1.to_upper_camel_case(), $s2)
                }
            };
        }

        t!(test1: "CamelCase" => "CamelCase");
        t!(test2: "This is Human case." => "ThisIsHumanCase");
        t!(test3: "MixedUP_CamelCase, with some Spaces" => "MixedUpCamelCaseWithSomeSpaces");
        t!(test4: "mixed_up_ snake_case, with some _spaces" => "MixedUpSnakeCaseWithSomeSpaces");
        t!(test5: "kebab-case" => "KebabCase");
        t!(test6: "SHOUTY_SNAKE_CASE" => "ShoutySnakeCase");
        t!(test7: "snake_case" => "SnakeCase");
        t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "ThisContainsAllKindsOfWordBoundaries");
        #[cfg(feature = "unicode")]
        t!(test9: "XΣXΣ baﬄe" => "XσxςBaﬄe");
        t!(test10: "XMLHttpRequest" => "XmlHttpRequest");
    }