Here is my code, AC on my local jest env, but can't pass the test
<pre class="shiki github-dark shaku"><code> class APICache { constructor(threshold, size, fetcher = () =&gt; Promise.resolve()) { this.threshold = threshold; this.size = size; this.fetcher = fetcher; this.cache = []; } /** * @param {string} path * @param {object} config * only plain objects/array made up serializable primitives * @returns {Promise&lt;any&gt;} */ add(path, config) { this.evictCache(); const cachedPromise = this.findCache(path, config); if (cachedPromise) { return cachedPromise; } const promise = this.fetcher(path, config); this.cache.push([[path, config], +new Date(), promise]); if (this.cache.length &gt; this.size) { this.cache.shift(); } return promise; } clear() { this.cache = []; } evictCache() { const now = +new Date(); this.cache = this.cache.filter(([_, time]) =&gt; { const passed = now - time; return passed &lt;= this.threshold; }); } /** * @param {string} path * @param {object} config * only plain objects/array made up serializable primitives * @returns {Promise&lt;any&gt;} */ findCache(path, config) { const result = this.cache.find(([[cachedPath, cachedConfig]]) =&gt; { if (path !== cachedPath) { return false; } return APICache.deepEqual(config, cachedConfig); }); if (!result) { return result; } return result[2]; } /** * @param {any} input1 * @param {any} input2 */ static deepEqual(input1, input2) { let visited = new Set(); function dfs(val1, val2) { if (typeof val1 !== "object" || typeof val2 !== "object") { return val1 === val2; } if (visited.has(val1) &amp;&amp; visited.has(val2)) { return true; } const sortKey = (a, b) =&gt; ("" + a).localeCompare("" + b); let ks1 = Object.keys(val1).sort(sortKey); let ks2 = Object.keys(val2).sort(sortKey); if (ks1.length !== ks2.length) { return false; } visited.add(val1); visited.add(val2); for (let i = 0; i &lt; ks1.length; i++) { const k1 = ks1[i]; const k2 = ks2[i]; if (k1 !== k2) { return false; } const v1 = val1[k1]; const v2 = val2[k2]; if (!dfs(v1, v2)) { return false; } } return true; } return dfs(input1, input2); }}getAPIWithMerging.apiCache = new APICache(1000, 5, getAPI);function getAPIWithMerging(path, config) { return getAPIWithMerging.apiCache.add(path, config);}getAPIWithMerging.clearCache = () =&gt; { getAPIWithMerging.apiCache.clear();};</code></pre>

Something wrong with the test env

> ⚠️ This questions is updated on Oct 22, 2022 which has breaking changes on test specs.Thanks to @Qzlt4LK. Suppose we have a utility function getAPI(…