fluent4rs 2.3.1

Parser / codec for [Fluent FTL files](https://github.com/projectfluent/fluent/blob/master/spec/fluent.ebnf), written for [lingora](https://github.com/nigeleke/lingora) (a localization management program), and may be found to be useful outside of that context. It is not intended to replace any aspects of the [fluent-rs](https://github.com/projectfluent/fluent-rs) crate implemented by [Project Fluent](https://projectfluent.org/), and, for the majority of language translation needs, the reader is referred back to that crate.
Documentation 
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use fluent4rs::prelude::{Fluent4rsError, Parser};
use pretty_assertions::assert_eq;

#[test]
fn full_grammar_will_be_parsed() {
    // ftl0 may not be layed out, but will be parsable.
    let ftl0 = include_str!("data/full_grammar_example.ftl");
    let ast0 = Parser::parse(ftl0).unwrap();

    // ftl1 will laid out and will parse to same AST as ast0.
    let ftl1 = ast0.to_string();
    let ast1 = Parser::parse(&ftl1).unwrap();

    assert_eq!(ast1, ast0);

    // ,,, and layed out version of second ast should be the same as the first.
    let ftl2 = ast1.to_string();
    assert_eq!(ftl2, ftl1);
}

#[test]
fn empty_grammar_will_be_parsed() {
    // ftl0 may not be layed out, but will be parsable.
    let ftl0 = "";
    let ast0 = Parser::parse(ftl0).unwrap();

    // ftl1 will laid out and will parse to same AST as ast0.
    let ftl1 = ast0.to_string();
    let ast1 = Parser::parse(&ftl1).unwrap();

    assert_eq!(ast1, ast0);

    // ,,, and layed out version of second ast should be the same as the first.
    let ftl2 = ast1.to_string();
    assert_eq!(ftl2, ftl1);
}

#[test]
fn garbage_grammar_will_be_an_error() {
    // ftl0 may not be layed out, but will be parsable.
    let ftl0 = r#"asdhj asdasdkjhk { &&*$%$% }
        dfsdfjh jhksdfh *($(*%&$&
"#;
    let error = Parser::parse(ftl0).unwrap_err();
    assert!(matches!(error, Fluent4rsError::UnwantedJunk(_)));
}

#[test]
fn garbage_grammar_will_be_returned() {
    // ftl0 may not be layed out, but will be parsable.
    let ftl0 = r#"asdhj asdasdkjhk { &&*$%$% }
        dfsdfjh jhksdfh *($(*%&$&
"#;
    let ast0 = Parser::parse_with_junk(ftl0).unwrap();

    // ftl1 will laid out and will parse to same AST as ast0.
    let ftl1 = ast0.to_string();
    let ast1 = Parser::parse_with_junk(&ftl1).unwrap();

    assert_eq!(ast1, ast0);

    // ,,, and layed out version of second ast should be the same as the first.
    let ftl2 = ast1.to_string();
    assert_eq!(ftl2, ftl1);
}