mrml 6.0.0

Rust implementation of MJML renderer
Documentation 
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#[cfg(test)]
mod tests {
    use std::marker::PhantomData;

    use crate::comment::Comment;
    use crate::mj_preview::{MjPreview, MjPreviewChild};
    use crate::prelude::OneOrMany;
    use crate::text::Text;

    #[test]
    fn serialize() {
        let elt = MjPreview::from("Hello World");
        assert_eq!(
            serde_json::to_string(&elt).unwrap(),
            r#"{"type":"mj-preview","children":"Hello World"}"#
        );

        let elt = MjPreview {
            tag: PhantomData,
            attributes: (),
            children: OneOrMany::Many(vec![
                MjPreviewChild::Text(Text::from("Hello World")),
                MjPreviewChild::Comment(Comment::from("this is a comment")),
            ]),
        };
        assert_eq!(
            serde_json::to_string(&elt).unwrap(),
            r#"{"type":"mj-preview","children":["Hello World",{"type":"comment","children":"this is a comment"}]}"#
        );
    }

    #[test]
    fn deserialize() {
        let elt = MjPreview::from("Hello World");
        let json = serde_json::to_string(&elt).unwrap();
        let res: MjPreview = serde_json::from_str(&json).unwrap();
        assert_eq!(res.children, elt.children);
    }

    #[test]
    fn deserialize_single_child() {
        // for backward compatibility
        let first: MjPreview =
            serde_json::from_str(r#"{"type":"mj-preview","children":"Hello World"}"#).unwrap();
        let second: MjPreview =
            serde_json::from_str(r#"{"type":"mj-preview","children":["Hello World"]}"#).unwrap();
        let first_children = Vec::from_iter(first.children.iter());
        let second_children = Vec::from_iter(second.children.iter());
        assert_eq!(first_children, second_children);
    }
}