mod lex_tests {
    use relish::ast::lex;

    #[test]
    fn test_lex_basic_pair() {
        let document = String::from("(hello 'world')");
        assert_eq!(
            lex(&document).unwrap().to_string(),
            document
        );
    }

    #[test]
    fn test_lex_basic_list() {
        let document = String::from("(hello 'world' 1 2 3)");
        assert_eq!(
            lex(&document).unwrap().to_string(),
            document
        );
    }

    #[test]
    fn test_lex_complex_list() {
        let document = String::from("(hello 'world' (1 2 (1 2 3)) 1 2 3)");
        assert_eq!(
            lex(&document).unwrap().to_string(),
            document
        );
    }

    #[test]
    fn test_bad_symbol() {
        let document = String::from("(as;dd)");
        let output: &str = "Problem lexing document: \"Unparsable token: as;dd\"";
         assert_eq!(
            lex(&document).err().unwrap(),
            output.to_string(),
        );
    }

    #[test]
    fn test_list_delim_in_str() {
        let document = String::from("('(')");
        assert_eq!(
            lex(&document).unwrap().to_string(),
            document
        );
    }

    #[test]
    fn test_empty_string() {
        let document = String::from("('')");
        assert_eq!(
            lex(&document).unwrap().to_string(),
            document
        );
    }

    #[test]
    fn test_unmatched_list_delim_flat() {
        let document = String::from("(one two");
        let output: &str = "Problem lexing document: \"Unmatched list delimiter in input\"";
         assert_eq!(
            lex(&document).err().unwrap(),
            output.to_string(),
        );
    }

    #[test]
    fn test_unmatched_list_delim_complex() {
        let document = String::from("(one two (three)");
        let output: &str = "Problem lexing document: \"Unmatched list delimiter in input\"";
         assert_eq!(
            lex(&document).err().unwrap(),
            output.to_string(),
        );
    }

    #[test]
    fn test_comment() {
        let document = String::from("#!/bin/relish\n(one two)");
        let output: &str = "(one two)";
         assert_eq!(
            lex(&document).unwrap().to_string(),
            output.to_string(),
        );
    }

    #[test]
    fn test_postline_comment() {
        let document =
            String::from("#!/bin/relish\n((one two)# another doc comment\n(three four))");
        let output: &str = "((one two) (three four))";
         assert_eq!(
            lex(&document).unwrap().to_string(),
            output.to_string(),
        );
    }

    #[test]
    fn test_inline_comment() {
        let document = String::from("#!/bin/relish\n((one two)\n# another doc comment\nthree)");
        let output: &str = "((one two) three)";
           assert_eq!(
            lex(&document).unwrap().to_string(),
            output.to_string(),
        );

    }

    #[test]
    fn test_bad_token_list() {
        let document = String::from("(one t(wo)");
        let output: &str = "Problem lexing document: \"list started in middle of another token\"";
         assert_eq!(
            lex(&document).err().unwrap(),
            output.to_string(),
        );
    }
}