nEngine/apps/editor/test/mods-model.test.ts

import { describe, expect, it } from "vitest";
import type { EditorModsList } from "../src/ipc.js";
import { enabledModsCount, isModEnabled, toggleEnabled } from "../src/renderer/mods-model.js";

function list(enabled: string[] | null, ids: string[]): EditorModsList {
  return { enabled, mods: ids.map((id) => ({ id, version: "1.0.0", hooks: ["onDayStart"], loaded: true })) };
}

describe("mods-model toggle logic (F1)", () => {
  it("a null enabled list means every known mod is enabled", () => {
    const l = list(null, ["a-mod", "b-mod"]);
    expect(isModEnabled(l, "a-mod")).toBe(true);
    expect(isModEnabled(l, "b-mod")).toBe(true);
    expect(enabledModsCount(l)).toBe(2);
  });

  it("disabling a mod with no explicit list makes the rest explicit", () => {
    const l = list(null, ["a-mod", "b-mod", "c-mod"]);
    const next = toggleEnabled(l, "b-mod", false);
    expect(next).toEqual(["a-mod", "c-mod"]);
    const l2 = list(next, ["a-mod", "b-mod", "c-mod"]);
    expect(isModEnabled(l2, "b-mod")).toBe(false);
    expect(enabledModsCount(l2)).toBe(2);
  });

  it("re-enabling appends the id back", () => {
    const l = list(["a-mod", "c-mod"], ["a-mod", "b-mod", "c-mod"]);
    const next = toggleEnabled(l, "b-mod", true);
    expect(next).toEqual(["a-mod", "c-mod", "b-mod"]);
  });

  it("disabling with an explicit list removes only that id", () => {
    const l = list(["a-mod", "b-mod", "c-mod"], ["a-mod", "b-mod", "c-mod"]);
    expect(toggleEnabled(l, "a-mod", false)).toEqual(["b-mod", "c-mod"]);
  });

  it("disabling the last mod yields an empty list (all disabled), never a deletion", () => {
    const l = list(null, ["a-mod"]);
    expect(toggleEnabled(l, "a-mod", false)).toEqual([]);
    const l2 = list([], ["a-mod"]);
    expect(toggleEnabled(l2, "a-mod", true)).toEqual(["a-mod"]);
    expect(enabledModsCount(list([], ["a-mod"]))).toBe(0);
  });

  it("an unknown id in the enabled list is counted but never toggles others", () => {
    const l = list(["ghost"], ["a-mod"]);
    expect(enabledModsCount(l)).toBe(0);
    expect(isModEnabled(l, "a-mod")).toBe(false);
  });
});