nix-js/nix-js/tests/to_string.rs

mod utils;

use nix_js::value::Value;
use utils::eval;

#[test]
fn string_returns_as_is() {
    assert_eq!(
        eval(r#"toString "hello""#),
        Value::String("hello".to_string())
    );
}

#[test]
fn integer_to_string() {
    assert_eq!(eval("toString 42"), Value::String("42".to_string()));
    assert_eq!(eval("toString (-5)"), Value::String("-5".to_string()));
    assert_eq!(eval("toString 0"), Value::String("0".to_string()));
}

#[test]
fn float_to_string() {
    assert_eq!(eval("toString 3.14"), Value::String("3.14".to_string()));
    assert_eq!(eval("toString 0.0"), Value::String("0".to_string()));
    assert_eq!(eval("toString (-2.5)"), Value::String("-2.5".to_string()));
}

#[test]
fn bool_to_string() {
    assert_eq!(eval("toString true"), Value::String("1".to_string()));
    assert_eq!(eval("toString false"), Value::String("".to_string()));
}

#[test]
fn null_to_string() {
    assert_eq!(eval("toString null"), Value::String("".to_string()));
}

#[test]
fn simple_list_to_string() {
    assert_eq!(eval("toString [1 2 3]"), Value::String("1 2 3".to_string()));
    assert_eq!(
        eval(r#"toString ["a" "b" "c"]"#),
        Value::String("a b c".to_string())
    );
}

#[test]
fn nested_list_flattens() {
    assert_eq!(
        eval("toString [[1 2] [3 4]]"),
        Value::String("1 2 3 4".to_string())
    );
    assert_eq!(
        eval("toString [1 [2 3] 4]"),
        Value::String("1 2 3 4".to_string())
    );
}

#[test]
fn empty_list_in_list_no_extra_space() {
    assert_eq!(eval("toString [1 [] 2]"), Value::String("1 2".to_string()));
    assert_eq!(eval("toString [[] 1 2]"), Value::String("1 2".to_string()));
    assert_eq!(eval("toString [1 2 []]"), Value::String("1 2 ".to_string()));
}

#[test]
fn list_with_multiple_empty_lists() {
    assert_eq!(
        eval("toString [1 [] [] 2]"),
        Value::String("1 2".to_string())
    );
    assert_eq!(eval("toString [[] [] 1]"), Value::String("1".to_string()));
}

#[test]
fn list_with_bool_and_null() {
    assert_eq!(
        eval("toString [true false null]"),
        Value::String("1  ".to_string())
    );
    assert_eq!(
        eval("toString [1 true 2 false 3]"),
        Value::String("1 1 2  3".to_string())
    );
}

#[test]
fn mixed_type_list() {
    assert_eq!(
        eval(r#"toString [1 "hello" 2.5 true]"#),
        Value::String("1 hello 2.5 1".to_string())
    );
}

#[test]
fn attrs_with_out_path() {
    assert_eq!(
        eval(r#"toString { outPath = "/nix/store/foo"; }"#),
        Value::String("/nix/store/foo".to_string())
    );
}

#[test]
fn attrs_with_to_string_method() {
    assert_eq!(
        eval(r#"toString { __toString = self: "custom"; }"#),
        Value::String("custom".to_string())
    );
}

#[test]
fn attrs_to_string_self_reference() {
    assert_eq!(
        eval(
            r#"let obj = { x = 42; __toString = self: "x is ${toString self.x}"; }; in toString obj"#
        ),
        Value::String("x is 42".to_string())
    );
}

#[test]
fn attrs_to_string_priority() {
    assert_eq!(
        eval(r#"toString { __toString = self: "custom"; outPath = "/nix/store/foo"; }"#),
        Value::String("custom".to_string())
    );
}

#[test]
fn derivation_like_object() {
    assert_eq!(
        eval(
            r#"let drv = { type = "derivation"; outPath = "/nix/store/hash-pkg"; }; in toString drv"#
        ),
        Value::String("/nix/store/hash-pkg".to_string())
    );
}

#[test]
fn string_interpolation_with_int() {
    assert_eq!(
        eval(r#""value: ${toString 42}""#),
        Value::String("value: 42".to_string())
    );
}

#[test]
fn string_interpolation_with_list() {
    assert_eq!(
        eval(r#""items: ${toString [1 2 3]}""#),
        Value::String("items: 1 2 3".to_string())
    );
}

#[test]
fn nested_to_string_calls() {
    assert_eq!(
        eval(r#"toString (toString 42)"#),
        Value::String("42".to_string())
    );
}

#[test]
fn to_string_in_let_binding() {
    assert_eq!(
        eval(r#"let x = toString 42; y = toString 10; in "${x}-${y}""#),
        Value::String("42-10".to_string())
    );
}

#[test]
fn empty_string() {
    assert_eq!(eval(r#"toString """#), Value::String("".to_string()));
}

#[test]
fn empty_list() {
    assert_eq!(eval("toString []"), Value::String("".to_string()));
}

#[test]
fn to_string_preserves_spaces_in_strings() {
    assert_eq!(
        eval(r#"toString "hello  world""#),
        Value::String("hello  world".to_string())
    );
}

#[test]
fn list_of_empty_strings() {
    assert_eq!(
        eval(r#"toString ["" "" ""]"#),
        Value::String("  ".to_string())
    );
}

#[test]
fn deeply_nested_lists() {
    assert_eq!(
        eval("toString [[[1] [2]] [[3] [4]]]"),
        Value::String("1 2 3 4".to_string())
    );
}

#[test]
fn list_with_nested_empty_lists() {
    assert_eq!(
        eval("toString [1 [[]] 2]"),
        Value::String("1  2".to_string())
    );
}

#[test]
fn attrs_without_out_path_or_to_string_fails() {
    let result = utils::eval_result(r#"toString { foo = "bar"; }"#);
    assert!(result.is_err());
}

#[test]
fn function_to_string_fails() {
    let result = utils::eval_result("toString (x: x)");
    assert!(result.is_err());
}

#[test]
fn to_string_method_must_return_string() {
    assert_eq!(
        utils::eval(r#"toString { __toString = self: 42; }"#),
        Value::String("42".into())
    );
    assert_eq!(
        utils::eval(r#"toString { __toString = self: true; }"#),
        Value::String("1".into())
    );
}

#[test]
fn out_path_can_be_nested() {
    assert_eq!(
        eval(r#"toString { outPath = { outPath = "/final/path"; }; }"#),
        Value::String("/final/path".to_string())
    );
}

#[test]
fn list_spacing_matches_nix_behavior() {
    assert_eq!(
        eval(r#"toString ["a" "b"]"#),
        Value::String("a b".to_string())
    );

    assert_eq!(
        eval(r#"toString ["a" ["b" "c"] "d"]"#),
        Value::String("a b c d".to_string())
    );
}