mod append_lib_tests {
    use relish::ast::{Ctr, eval, lex, SymTable};
    use relish::stdlib::{static_stdlib, dynamic_stdlib};

    #[test]
    fn test_append_to_empty_list() {
        let document = "(append () 1)";
        let result = "(1)";

        let mut syms = SymTable::new();
        static_stdlib(&mut syms).unwrap();
        dynamic_stdlib(false, &mut syms).unwrap();

        if let Ok(tree) = lex(&document.to_string()) {
            if let Ctr::Seg(ref s) = *eval(&tree, &mut syms).unwrap() {
                assert_eq!(s.to_string(), result);
            }
        } else {
            assert!(false)
        }
    }

    #[test]
    fn test_append_to_full_list() {
        let document = "(append (1 2) 3)";
        let result = "(1 2 3)";

        let mut syms = SymTable::new();
        static_stdlib(&mut syms).unwrap();
        dynamic_stdlib(false, &mut syms).unwrap();

        if let Ok(tree) = lex(&document.to_string()) {
            if let Ctr::Seg(ref s) = *eval(&tree, &mut syms).unwrap() {
                assert_eq!(s.to_string(), result);
            }
        } else {
            assert!(false);
        }
    }

    #[test]
    fn test_mono_append() {
        let document = "(append)";
        let result = "(<nil>)";

        let mut syms = SymTable::new();
        static_stdlib(&mut syms).unwrap();
        dynamic_stdlib(false, &mut syms).unwrap();

        if let Ok(tree) = lex(&document.to_string()) {
            if let Ctr::Seg(ref s) = *eval(&tree, &mut syms).unwrap() {
                assert_eq!(s.to_string(), result);
            }
        } else {
            assert!(false);
        }
    }

    #[test]
    fn test_append_no_list() {
        let document = "(append 'test' 1 2 3)";
        let result = "('test' 1 2 3)";

        let mut syms = SymTable::new();
        static_stdlib(&mut syms).unwrap();
        dynamic_stdlib(false, &mut syms).unwrap();

        if let Ok(tree) = lex(&document.to_string()) {
            if let Ctr::Seg(ref s) = *eval(&tree, &mut syms).unwrap() {
                assert_eq!(s.to_string(), result);
            }
        } else {
            assert!(false);
        }
    }
}