File size: 2,294 Bytes
fc93158 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 | import { afterEach, describe, expect, it, vi } from "vitest";
import { resolveGlobalMap, resolveGlobalSingleton } from "./global-singleton.js";
const TEST_KEY = Symbol("global-singleton:test");
const TEST_MAP_KEY = Symbol("global-singleton:test-map");
afterEach(() => {
delete (globalThis as Record<PropertyKey, unknown>)[TEST_KEY];
delete (globalThis as Record<PropertyKey, unknown>)[TEST_MAP_KEY];
});
describe("resolveGlobalSingleton", () => {
it("reuses an initialized singleton", () => {
const create = vi.fn(() => ({ value: 1 }));
const first = resolveGlobalSingleton(TEST_KEY, create);
const second = resolveGlobalSingleton(TEST_KEY, create);
expect(first).toBe(second);
expect(create).toHaveBeenCalledTimes(1);
});
it("does not re-run the factory when undefined was already stored", () => {
const create = vi.fn(() => undefined);
expect(resolveGlobalSingleton(TEST_KEY, create)).toBeUndefined();
expect(resolveGlobalSingleton(TEST_KEY, create)).toBeUndefined();
expect(create).toHaveBeenCalledTimes(1);
});
it("reuses a prepopulated global value without calling the factory", () => {
const existing = { value: 7 };
const create = vi.fn(() => ({ value: 1 }));
(globalThis as Record<PropertyKey, unknown>)[TEST_KEY] = existing;
expect(resolveGlobalSingleton(TEST_KEY, create)).toBe(existing);
expect(create).not.toHaveBeenCalled();
});
});
describe("resolveGlobalMap", () => {
it("reuses the same map instance", () => {
const first = resolveGlobalMap<string, number>(TEST_MAP_KEY);
const second = resolveGlobalMap<string, number>(TEST_MAP_KEY);
expect(first).toBe(second);
});
it("preserves existing map contents across repeated resolution", () => {
const map = resolveGlobalMap<string, number>(TEST_MAP_KEY);
map.set("a", 1);
expect(resolveGlobalMap<string, number>(TEST_MAP_KEY).get("a")).toBe(1);
});
it("reuses a prepopulated global map without creating a new one", () => {
const existing = new Map<string, number>([["a", 1]]);
(globalThis as Record<PropertyKey, unknown>)[TEST_MAP_KEY] = existing;
const resolved = resolveGlobalMap<string, number>(TEST_MAP_KEY);
expect(resolved).toBe(existing);
expect(resolved.get("a")).toBe(1);
});
});
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