import { expect, test } from "vitest";

import { formatDate } from "./format-date";

test("formats a date-only string in the locale without a timezone day-shift", () => {
  expect(formatDate("1962-04-03", "en")).toBe("Apr 3, 1962");
});

test("returns the em-dash placeholder for null", () => {
  expect(formatDate(null, "en")).toBe("—");
});

test("returns an unparseable string unchanged", () => {
  expect(formatDate("not-a-date", "en")).toBe("not-a-date");
});

test("stringifies a non-string, non-null value", () => {
  expect(formatDate(42, "en")).toBe("42");
});