// Error-format helper tests cover the non-Error cause stringifier contract.

import { describe, expect, it } from "vitest";

import { stringifyNonErrorCause } from "./error-format.js";

describe("stringifyNonErrorCause", () => {

it("returns a string for values JSON.stringify serializes to undefined", () => {

// JSON.stringify(fn|symbol|undefined) is undefined; the `string`-typed helper must not leak it.

expect(stringifyNonErrorCause(() => {})).toBe("[object Function]");

expect(stringifyNonErrorCause(Symbol("x"))).toBe("[object Symbol]");

expect(stringifyNonErrorCause(undefined)).toBe("[object Undefined]");

});

it("stringifies ordinary scalar and object causes", () => {

expect(stringifyNonErrorCause({ a: 1 })).toBe('{"a":1}');

expect(stringifyNonErrorCause("hi")).toBe("hi");

expect(stringifyNonErrorCause(42)).toBe("42");

expect(stringifyNonErrorCause(null)).toBe("null");

});

});