mod lex_tests {
    use relish::ast::{lex, ast_to_string};

    #[test]
    fn test_lex_basic_pair() {
        let document: &str = "(hello 'world')";
        match lex(document.to_string()) {
            Ok(tree) => {
                assert_eq!(ast_to_string(tree), document);
            },
            Err(s) => {
                print!("{}\n", s);
                assert!(false);
            }
        }
    }

    #[test]
    fn test_lex_basic_list() {
        let document: &str = "(hello 'world' 1 2 3)";
        match lex(document.to_string()) {
            Ok(tree) => {
                assert_eq!(ast_to_string(tree), document);
            },
            Err(s) => {
                print!("{}\n", s);
                assert!(false);
            }
        }
    }

    #[test]
    fn test_lex_complex_list() {
        let document: &str = "(hello 'world' (1 2 (1 2 3)) 1 2 3)";
        match lex(document.to_string()) {
            Ok(tree) => {
                assert_eq!(ast_to_string(tree), document);
            },
            Err(s) => {
                print!("{}\n", s);
                assert!(false);
            }
        }
    }

    #[test]
    fn test_bad_symbol() {
        let document: &str = "(as;dd)";
        let output: &str = "Problem lexing document: \"Unparsable token: as;dd\"";
        match lex(document.to_string()) {
            Ok(tree) => {
                print!("Bad token yielded: {}\n", ast_to_string(tree));
                assert!(false);
            },
            Err(s) => {
                assert_eq!(s, output.to_string());
            }
        }
    }

    #[test]
    fn test_unmatched_list_delim_flat() {
        let document: &str = "(one two";
        let output: &str = "Problem lexing document: \"Unmatched list delimiter in input\"";
        match lex(document.to_string()) {
            Ok(tree) => {
                print!("Bad token yielded: {}\n", ast_to_string(tree));
                assert!(false);
            },
            Err(s) => {
                assert_eq!(s, output.to_string());
            }
        }
    }

    #[test]
    fn test_unmatched_list_delim_complex() {
        let document: &str = "(one two (three)";
        let output: &str = "Problem lexing document: \"Unmatched list delimiter in input\"";
        match lex(document.to_string()) {
            Ok(tree) => {
                print!("Bad token yielded: {}\n", ast_to_string(tree));
                assert!(false);
            },
            Err(s) => {
                assert_eq!(s, output.to_string());
            }
        }
    }

    #[test]
    fn test_comment() {
        let document: &str = "#!/bin/relish\n(one two)";
        let output: &str = "(one two)";
        match lex(document.to_string()) {
            Ok(tree) => {
                assert_eq!(ast_to_string(tree), output.to_string());
            },
            Err(s) => {
                print!("{}\n", s);
                assert!(false);
            }
        }
    }

    #[test]
    fn test_postline_comment() {
        let document: &str = "#!/bin/relish\n((one two)# another doc comment\n(three four))";
        let output: &str = "((one two) (three four))";
        match lex(document.to_string()) {
            Ok(tree) => {
                assert_eq!(ast_to_string(tree), output.to_string());
            },
            Err(s) => {
                print!("{}\n", s);
                assert!(false);
            }
        }
    }

    #[test]
    fn test_inline_comment() {
        let document: &str = "#!/bin/relish\n((one two)\n# another doc comment\nthree)";
        let output: &str = "((one two) three)";
        match lex(document.to_string()) {
            Ok(tree) => {
                assert_eq!(ast_to_string(tree), output.to_string());
            },
            Err(s) => {
                print!("{}\n", s);
                assert!(false);
            }
        }
    }

    #[test]
    fn test_bad_token_list() {
        let document: &str = "(one t(wo)";
        let output: &str = "Problem lexing document: \"list started in middle of another token\"";
        match lex(document.to_string()) {
            Ok(tree) => {
                print!("Bad token yielded: {}\n", ast_to_string(tree));
                assert!(false);
            },
            Err(s) => {
                assert_eq!(s, output.to_string());
            }
        }
    }
}