Function mrml::to_preview

pub fn to_preview(input: &str, options: Options) -> Result<String, Error>

generate the preview from mjml

use mrml::{to_preview, Options};
let result = to_preview("<mjml></mjml>", Options::default());
assert!(result.is_ok());

use mrml::{to_preview, Options};
let result = to_preview("<mjml", Options::default());
assert!(result.is_err());