81 lines
3.2 KiB
TypeScript
81 lines
3.2 KiB
TypeScript
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import { afterEach, beforeEach, describe, expect, test } from 'bun:test';
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import { getRuntimeKey } from './runtime-switch';
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/**
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* `getRuntimeKey` runs on store, event, and render paths, so its cost is
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* multiplied by everything the UI does. These tests pin both directions of the
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* derived-key cache: repeated calls with unchanged inputs must do no work, and
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* any change to the inputs it derives from must still be observed.
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*
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* This lives in its own file because the cache is only reachable while the
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* runtime endpoint has not been explicitly initialised, and module state is
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* shared across tests within a file.
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*/
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type RuntimeWindow = typeof globalThis & {
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__OPENCHAMBER_API_BASE_URL__?: string;
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__OPENCHAMBER_LOCAL_ORIGIN__?: string;
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};
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const previousWindow = Object.getOwnPropertyDescriptor(globalThis, 'window');
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const NativeURL = globalThis.URL;
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let urlConstructions = 0;
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const setRuntimeWindow = (apiBaseUrl: string | undefined, localOrigin: string | undefined): void => {
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const runtimeWindow = {} as RuntimeWindow;
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if (apiBaseUrl !== undefined) runtimeWindow.__OPENCHAMBER_API_BASE_URL__ = apiBaseUrl;
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if (localOrigin !== undefined) runtimeWindow.__OPENCHAMBER_LOCAL_ORIGIN__ = localOrigin;
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Object.defineProperty(globalThis, 'window', { value: runtimeWindow, configurable: true, writable: true });
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};
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beforeEach(() => {
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urlConstructions = 0;
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class CountingURL extends NativeURL {
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constructor(url: string | URL, base?: string | URL) {
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urlConstructions += 1;
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super(url, base);
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}
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}
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globalThis.URL = CountingURL as unknown as typeof URL;
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});
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afterEach(() => {
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globalThis.URL = NativeURL;
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if (previousWindow) Object.defineProperty(globalThis, 'window', previousWindow);
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else Reflect.deleteProperty(globalThis, 'window');
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});
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describe('getRuntimeKey caching', () => {
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test('resolves a same-origin endpoint to the local runtime key', () => {
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setRuntimeWindow('https://app.example.com/api', 'https://app.example.com');
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expect(getRuntimeKey()).toBe('local');
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});
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test('performs no URL work on repeated calls with unchanged inputs', () => {
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setRuntimeWindow('https://remote.example.com', 'https://app.example.com');
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const first = getRuntimeKey();
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expect(first).toBe('url:https://remote.example.com');
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urlConstructions = 0;
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for (let index = 0; index < 50; index += 1) expect(getRuntimeKey()).toBe(first);
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expect(urlConstructions).toBe(0);
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});
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test('recomputes when the injected API base URL changes at runtime', () => {
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setRuntimeWindow('https://first.example.com', 'https://app.example.com');
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expect(getRuntimeKey()).toBe('url:https://first.example.com');
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(globalThis as RuntimeWindow & { window: RuntimeWindow }).window.__OPENCHAMBER_API_BASE_URL__ = 'https://second.example.com';
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expect(getRuntimeKey()).toBe('url:https://second.example.com');
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});
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test('recomputes when the injected local origin changes at runtime', () => {
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setRuntimeWindow('https://app.example.com', 'https://other.example.com');
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expect(getRuntimeKey()).toBe('url:https://app.example.com');
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(globalThis as RuntimeWindow & { window: RuntimeWindow }).window.__OPENCHAMBER_LOCAL_ORIGIN__ = 'https://app.example.com';
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expect(getRuntimeKey()).toBe('local');
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});
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});
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