import { describe, it, expect } from "vitest";
import { parsePositiveIntId } from "./parseId";

describe("parsePositiveIntId", () => {
  it("accepts a positive integer", () => {
    expect(parsePositiveIntId("1")).toBe(1);
    expect(parsePositiveIntId("42")).toBe(42);
  });

  it("rejects empty / nullish", () => {
    expect(parsePositiveIntId("")).toBeNull();
    expect(parsePositiveIntId(null)).toBeNull();
    expect(parsePositiveIntId(undefined)).toBeNull();
  });

  it("rejects zero, negative, fractional, and non-numeric", () => {
    expect(parsePositiveIntId("0")).toBeNull();
    expect(parsePositiveIntId("-1")).toBeNull();
    expect(parsePositiveIntId("1.5")).toBeNull();
    expect(parsePositiveIntId("abc")).toBeNull();
    expect(parsePositiveIntId(" ")).toBeNull(); // Number(" ")===0
  });
});