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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687// UNIT test (mine to maintain — see ../../TESTING.md): the pure theme resolver and the// tolerant preference (de)serialization that backs the theme picker.import { describe, test, expect, beforeEach } from "bun:test";import { DEFAULT_PREFERENCE, DEFAULT_SYSTEM_MAPPING, THEME_STORAGE_KEY, loadThemePreference, parseThemePreference, resolveTheme, saveThemePreference, type ThemePreference,} from "./theme";
describe("resolveTheme", () => { test("a fixed preference returns its theme regardless of OS appearance", () => { const pref: ThemePreference = { mode: "fixed", theme: "light" }; expect(resolveTheme(pref, true)).toBe("light"); expect(resolveTheme(pref, false)).toBe("light"); });
test("a system preference maps OS dark/light to the configured theme", () => { const pref: ThemePreference = { mode: "system", mapping: { light: "light", dark: "dark" } }; expect(resolveTheme(pref, true)).toBe("dark"); expect(resolveTheme(pref, false)).toBe("light"); });
test("a system preference honors a non-default mapping", () => { const pref: ThemePreference = { mode: "system", mapping: { light: "solarized-light", dark: "solarized-dark" }, }; expect(resolveTheme(pref, true)).toBe("solarized-dark"); expect(resolveTheme(pref, false)).toBe("solarized-light"); });});
describe("parseThemePreference", () => { test("null (nothing stored) falls back to follow-system", () => { expect(parseThemePreference(null)).toEqual(DEFAULT_PREFERENCE); });
test("malformed JSON falls back to follow-system rather than throwing", () => { expect(parseThemePreference("{not json")).toEqual(DEFAULT_PREFERENCE); });
test("an unknown/legacy shape falls back to follow-system", () => { expect(parseThemePreference(JSON.stringify({ mode: "wat" }))).toEqual(DEFAULT_PREFERENCE); expect(parseThemePreference(JSON.stringify("dark"))).toEqual(DEFAULT_PREFERENCE); });
test("round-trips a fixed preference", () => { const pref: ThemePreference = { mode: "fixed", theme: "dark" }; expect(parseThemePreference(JSON.stringify(pref))).toEqual(pref); });
test("round-trips a system preference", () => { const pref: ThemePreference = { mode: "system", mapping: { light: "light", dark: "dark" }, }; expect(parseThemePreference(JSON.stringify(pref))).toEqual(pref); });
test("a system preference missing mapping slots is filled from the default", () => { const parsed = parseThemePreference(JSON.stringify({ mode: "system" })); expect(parsed).toEqual({ mode: "system", mapping: DEFAULT_SYSTEM_MAPPING }); });});
describe("loadThemePreference / saveThemePreference", () => { beforeEach(() => { localStorage.clear(); });
test("defaults to follow-system when nothing is stored", () => { expect(loadThemePreference()).toEqual(DEFAULT_PREFERENCE); });
test("persists under the papyrus:theme key and reads back", () => { const pref: ThemePreference = { mode: "fixed", theme: "light" }; saveThemePreference(pref); expect(localStorage.getItem(THEME_STORAGE_KEY)).toBe(JSON.stringify(pref)); expect(loadThemePreference()).toEqual(pref); });});