test: add test

test/browser/fixtures/benchmark/basic.bench.ts

@@ -0,0 +1,32 @@
+import { bench, describe } from 'vitest'
+
+describe('suite-a', () => {
+  bench('good', async () => {
+    await sleep(10)
+  }, options)
+
+  bench('bad', async () => {
+    await sleep(300)
+  }, options)
+})
+
+describe('suite-b', () => {
+  bench('good', async () => {
+    await sleep(25)
+  }, options)
+
+  describe('suite-b-nested', () => {
+    bench('good', async () => {
+      await sleep(50)
+    }, options)
+  })
+})
+
+const sleep = (ms: number) => new Promise(resolve => setTimeout(resolve, ms));
+
+const options = {
+  time: 0,
+  iterations: 2,
+  warmupIterations: 0,
+  warmupTime: 0,
+}

test/browser/fixtures/benchmark/vitest.config.ts

@@ -0,0 +1,17 @@
+import { fileURLToPath } from 'node:url'
+import { defineConfig } from 'vitest/config'
+
+const provider = process.env.PROVIDER || 'playwright'
+const name =
+  process.env.BROWSER || (provider === 'playwright' ? 'chromium' : 'chrome')
+
+export default defineConfig({
+  test: {
+    browser: {
+      enabled: true,
+      provider,
+      name,
+    },
+  },
+  cacheDir: fileURLToPath(new URL("./node_modules/.vite", import.meta.url)),
+})

test/browser/specs/benchmark.test.mjs

@@ -0,0 +1,19 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+import fs from 'node:fs'
+import { startVitest } from 'vitest/node'
+
+test('benchmark', async () => {
+  await fs.promises.rm('fixtures/benchmark/bench.json', { force: true })
+  await startVitest('benchmark', [], {
+    watch: false,
+    root: 'fixtures/benchmark',
+    browser: { headless: true },
+    benchmark: {
+      reporters: ['json'],
+      outputFile: 'bench.json',
+    },
+  })
+  const benchJson = JSON.parse(await fs.promises.readFile('fixtures/benchmark/bench.json', 'utf-8'))
+  assert.equal(benchJson.testResults['suite-a'][0].name, 'good')
+})