Measure test time

test/jest-light-runner/src/worker-runner.js

@@ -1,12 +1,13 @@
 import path from "path";
 import { fileURLToPath, pathToFileURL } from "url";
+import { performance } from "perf_hooks";
 import snapshot from "jest-snapshot";
 import expect from "expect";
 import * as circus from "jest-circus";
 
 import "./global-setup.js";
 
-/** @typedef {{ failures: number, passses: number, pending: number }} Stats */
+/** @typedef {{ failures: number, passses: number, pending: number, start: number, end: number }} Stats */
 /** @typedef {{ ancestors: string[], title: string, errors: Error[], skipped: boolean }} InternalTestResult */
 
 // Node.js workers (worker_therads) don't support
@@ -26,7 +27,7 @@ export default async function ({ test, updateSnapshot, port }) {
   port.postMessage("start");
 
   /** @type {Stats} */
-  const stats = { passes: 0, failures: 0, pending: 0 };
+  const stats = { passes: 0, failures: 0, pending: 0, start: 0, end: 0 };
   /** @type {Array<InternalTestResult>} */
   const results = [];
 
@@ -38,7 +39,9 @@ export default async function ({ test, updateSnapshot, port }) {
   );
   expect.setState({ snapshotState });
 
+  stats.start = performance.now();
   await runTestBlock(tests, hasFocusedTests, results, stats);
+  stats.end = performance.now();
 
   snapshotState._inlineSnapshots.forEach(({ frame }) => {
     // When using native ESM, errors have an URL location.
@@ -47,7 +50,7 @@ export default async function ({ test, updateSnapshot, port }) {
   });
   snapshotState.save();
 
-  return toTestResult(stats, results, test.path);
+  return toTestResult(stats, results, test);
 }
 
 async function loadTests(testFile) {
@@ -160,10 +163,13 @@ function callAsync(fn) {
  *
  * @param {Stats} stats
  * @param {Array<InternalTestResult>} tests
- * @param {string} path
+ * @param {import("@jest/test-result").Test} testInput
  * @returns {import("@jest/test-result").TestResult}
  */
-function toTestResult(stats, tests, path) {
+function toTestResult(stats, tests, { path, context }) {
+  const { start, end } = stats;
+  const runtime = end - start;
+
   return {
     coverage: globalThis.__coverage__,
     console: null,
@@ -175,8 +181,10 @@ function toTestResult(stats, tests, path) {
     numPassingTests: stats.passes,
     numPendingTests: stats.pending,
     perfStats: {
-      end: +new Date(stats.end),
-      start: +new Date(stats.start),
+      start,
+      end,
+      runtime: Math.round(runtime), // ms precision
+      slow: runtime / 1000 > context.config.slowTestThreshold,
     },
     skipped: false,
     snapshot: {