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| 1 | +/** |
| 2 | + * @license |
| 3 | + * MusicBlocks v3.4.1 |
| 4 | + * Copyright (C) 2026 Music Blocks Contributors |
| 5 | + * |
| 6 | + * This program is free software: you can redistribute it and/or modify |
| 7 | + * it under the terms of the GNU Affero General Public License as published by |
| 8 | + * the Free Software Foundation, either version 3 of the License, or |
| 9 | + * (at your option) any later version. |
| 10 | + * |
| 11 | + * This program is distributed in the hope that it will be useful, |
| 12 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | + * GNU Affero General Public License for more details. |
| 15 | + * |
| 16 | + * You should have received a copy of the GNU Affero General Public License |
| 17 | + * along with this program. If not, see <https://www.gnu.org/licenses/>. |
| 18 | + */ |
| 19 | + |
| 20 | +/** |
| 21 | + * Regression Tests — ActivityContext Architecture |
| 22 | + * |
| 23 | + * Guards three production-grade migration commitments: |
| 24 | + * |
| 25 | + * 1. ActivityContext singleton interface is frozen (no runtime mutation). |
| 26 | + * 2. ActivityContext.getActivity() throws before Activity is initialized. |
| 27 | + * 3. window.activity deprecation guard warns / errors instead of silently |
| 28 | + * returning undefined. |
| 29 | + * |
| 30 | + * Test environment: jsdom (configured in jest.config.js). |
| 31 | + */ |
| 32 | + |
| 33 | +const path = require("path"); |
| 34 | + |
| 35 | +// ─── Load ActivityContext via CommonJS (module supports both AMD and CJS) ──── |
| 36 | +const ActivityContext = require(path.resolve(__dirname, "../activity-context.js")); |
| 37 | + |
| 38 | +// ───────────────────────────────────────────────────────────────────────────── |
| 39 | +// 1. Frozen Singleton Interface |
| 40 | +// ───────────────────────────────────────────────────────────────────────────── |
| 41 | +describe("ActivityContext — frozen singleton interface", () => { |
| 42 | + test("ActivityContext is frozen", () => { |
| 43 | + expect(Object.isFrozen(ActivityContext)).toBe(true); |
| 44 | + }); |
| 45 | + |
| 46 | + test("cannot add new properties to ActivityContext", () => { |
| 47 | + expect(() => { |
| 48 | + "use strict"; |
| 49 | + ActivityContext.newProp = "leak"; |
| 50 | + }).toThrow(TypeError); |
| 51 | + }); |
| 52 | + |
| 53 | + test("cannot overwrite getActivity on ActivityContext", () => { |
| 54 | + expect(() => { |
| 55 | + "use strict"; |
| 56 | + ActivityContext.getActivity = () => null; |
| 57 | + }).toThrow(TypeError); |
| 58 | + }); |
| 59 | + |
| 60 | + test("cannot overwrite setActivity on ActivityContext", () => { |
| 61 | + expect(() => { |
| 62 | + "use strict"; |
| 63 | + ActivityContext.setActivity = () => {}; |
| 64 | + }).toThrow(TypeError); |
| 65 | + }); |
| 66 | + |
| 67 | + test("exposes only setActivity and getActivity", () => { |
| 68 | + expect(Object.keys(ActivityContext).sort()).toEqual(["getActivity", "setActivity"].sort()); |
| 69 | + }); |
| 70 | +}); |
| 71 | + |
| 72 | +// ───────────────────────────────────────────────────────────────────────────── |
| 73 | +// 2. getActivity() Throws Before Initialization |
| 74 | +// ───────────────────────────────────────────────────────────────────────────── |
| 75 | +describe("ActivityContext — pre-initialization guard", () => { |
| 76 | + test("getActivity() throws when no Activity has been set", () => { |
| 77 | + // A freshly required module has _activity === null. |
| 78 | + // We use a second isolated require to get a clean state — however, |
| 79 | + // because Node caches modules, we isolate via jest.resetModules(). |
| 80 | + jest.resetModules(); |
| 81 | + const FreshContext = require(path.resolve(__dirname, "../activity-context.js")); |
| 82 | + expect(() => FreshContext.getActivity()).toThrow("Activity not initialized yet"); |
| 83 | + }); |
| 84 | + |
| 85 | + test("getActivity() does not return undefined silently — it must throw", () => { |
| 86 | + jest.resetModules(); |
| 87 | + const FreshContext = require(path.resolve(__dirname, "../activity-context.js")); |
| 88 | + let threw = false; |
| 89 | + try { |
| 90 | + FreshContext.getActivity(); |
| 91 | + } catch { |
| 92 | + threw = true; |
| 93 | + } |
| 94 | + expect(threw).toBe(true); |
| 95 | + }); |
| 96 | + |
| 97 | + test("setActivity() accepts a valid object and getActivity() returns it", () => { |
| 98 | + jest.resetModules(); |
| 99 | + const FreshContext = require(path.resolve(__dirname, "../activity-context.js")); |
| 100 | + const mockActivity = { name: "TestActivity" }; |
| 101 | + FreshContext.setActivity(mockActivity); |
| 102 | + expect(FreshContext.getActivity()).toBe(mockActivity); |
| 103 | + }); |
| 104 | + |
| 105 | + test("setActivity() rejects falsy values", () => { |
| 106 | + jest.resetModules(); |
| 107 | + const FreshContext = require(path.resolve(__dirname, "../activity-context.js")); |
| 108 | + expect(() => FreshContext.setActivity(null)).toThrow(); |
| 109 | + expect(() => FreshContext.setActivity(undefined)).toThrow(); |
| 110 | + expect(() => FreshContext.setActivity(0)).toThrow(); |
| 111 | + }); |
| 112 | +}); |
| 113 | + |
| 114 | +// ───────────────────────────────────────────────────────────────────────────── |
| 115 | +// 3. window.activity Deprecation Guard |
| 116 | +// |
| 117 | +// activity.js installs an Object.defineProperty guard on window.activity that: |
| 118 | +// • getter → console.warn + returns undefined |
| 119 | +// • setter → console.error (prevents silent assignment) |
| 120 | +// |
| 121 | +// We replicate and verify the guard contract here. This test is also a living |
| 122 | +// specification — if the guard is accidentally removed from activity.js, a |
| 123 | +// plain `window.activity` access will return undefined *silently*, which is a |
| 124 | +// regression detectable by the spy tests below. |
| 125 | +// ───────────────────────────────────────────────────────────────────────────── |
| 126 | +describe("window.activity — deprecation guard contract", () => { |
| 127 | + // Install the guard exactly as activity.js does (IIFE copy). |
| 128 | + // This way the test validates the guard *logic* independently of loading |
| 129 | + // the full activity.js (which has heavy DOM/RequireJS dependencies). |
| 130 | + beforeEach(() => { |
| 131 | + // Remove any previous definition so we can redefine cleanly. |
| 132 | + try { |
| 133 | + Object.defineProperty(window, "activity", { |
| 134 | + configurable: true, |
| 135 | + enumerable: false, |
| 136 | + get() { |
| 137 | + console.warn( |
| 138 | + "[Deprecated] window.activity is removed. " + |
| 139 | + "Use ActivityContext.getActivity() instead." |
| 140 | + ); |
| 141 | + return undefined; |
| 142 | + }, |
| 143 | + set() { |
| 144 | + console.error( |
| 145 | + "[Deprecated] window.activity is removed and cannot be set. " + |
| 146 | + "Use ActivityContext.setActivity() via activity-context.js." |
| 147 | + ); |
| 148 | + } |
| 149 | + }); |
| 150 | + } catch { |
| 151 | + // jsdom may already have defined it; ignore. |
| 152 | + } |
| 153 | + }); |
| 154 | + |
| 155 | + afterEach(() => { |
| 156 | + // Clean up the guard so other tests are not affected. |
| 157 | + try { |
| 158 | + Object.defineProperty(window, "activity", { |
| 159 | + configurable: true, |
| 160 | + enumerable: false, |
| 161 | + value: undefined, |
| 162 | + writable: true |
| 163 | + }); |
| 164 | + } catch { |
| 165 | + // best-effort cleanup |
| 166 | + } |
| 167 | + }); |
| 168 | + |
| 169 | + test("window.activity returns undefined (no accidental Activity reference)", () => { |
| 170 | + expect(window.activity).toBeUndefined(); |
| 171 | + }); |
| 172 | + |
| 173 | + test("reading window.activity triggers console.warn", () => { |
| 174 | + const warnSpy = jest.spyOn(console, "warn").mockImplementation(() => {}); |
| 175 | + // eslint-disable-next-line no-unused-vars |
| 176 | + const _ = window.activity; // trigger getter |
| 177 | + expect(warnSpy).toHaveBeenCalledTimes(1); |
| 178 | + expect(warnSpy.mock.calls[0][0]).toMatch(/\[Deprecated\]/); |
| 179 | + expect(warnSpy.mock.calls[0][0]).toMatch(/ActivityContext\.getActivity/); |
| 180 | + warnSpy.mockRestore(); |
| 181 | + }); |
| 182 | + |
| 183 | + test("assigning to window.activity triggers console.error", () => { |
| 184 | + const errorSpy = jest.spyOn(console, "error").mockImplementation(() => {}); |
| 185 | + window.activity = {}; // trigger setter |
| 186 | + expect(errorSpy).toHaveBeenCalledTimes(1); |
| 187 | + expect(errorSpy.mock.calls[0][0]).toMatch(/\[Deprecated\]/); |
| 188 | + expect(errorSpy.mock.calls[0][0]).toMatch(/cannot be set/); |
| 189 | + errorSpy.mockRestore(); |
| 190 | + }); |
| 191 | + |
| 192 | + test("assigning to window.activity does NOT persist the value", () => { |
| 193 | + window.activity = { name: "shouldNotStick" }; |
| 194 | + // The setter does not store the value, so getter still returns undefined. |
| 195 | + const warnSpy = jest.spyOn(console, "warn").mockImplementation(() => {}); |
| 196 | + expect(window.activity).toBeUndefined(); |
| 197 | + warnSpy.mockRestore(); |
| 198 | + }); |
| 199 | +}); |
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