@@ -0,0 +1,78 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const { spawnSync } = require('child_process');
+
+const spawnTimeout = common.platformTimeout(30_000);
+
+function spawnNode(args, options = undefined) {
+  const result = spawnSync(process.execPath, args, {
+    __proto__: null,
+    encoding: 'utf8',
+    timeout: spawnTimeout,
+    ...options,
+  });
+  assert.ifError(result.error);
+  assert.strictEqual(result.signal, null);
+  return result;
+}
+
+function spawnBench(args, options = undefined) {
+  return spawnNode(['--no-warnings', '--bench', ...args], options);
+}
+
+for (const { args, message } of [
+  {
+    args: ['--bench-isolation=invalid', 'unused.js'],
+    message: /invalid value for --bench-isolation/,
+  },
+  {
+    args: ['--bench-samples=0', 'unused.js'],
+    message: /--bench-samples must be greater than 0/,
+  },
+  {
+    args: ['--bench-warmup=4294967296', 'unused.js'],
+    message: /--bench-warmup.*out of range/,
+  },
+  {
+    args: ['--bench-samples=2x', 'unused.js'],
+    message: /invalid value for --bench-samples/,
+  },
+  {
+    args: ['--bench-warmup=abc', 'unused.js'],
+    message: /invalid value for --bench-warmup/,
+  },
+  {
+    args: ['--bench-name-pattern=[', 'unused.js'],
+    message: /invalid regular expression/,
+  },
+  {
+    args: ['--eval=1', 'unused.js'],
+    message: /either --bench or --eval can be used, not both/,
+  },
+  {
+    args: ['--interactive', 'unused.js'],
+    message: /either --bench or --interactive can be used, not both/,
+  },
+  {
+    args: ['--watch', 'unused.js'],
+    message: /either --bench or --watch can be used, not both/,
+  },
+  {
+    args: ['--watch-path=.', 'unused.js'],
+    message: /either --bench or --watch can be used, not both/,
+  },
+  {
+    args: ['--check', 'unused.js'],
+    message: /either --bench or --check can be used, not both/,
+  },
+  {
+    args: ['--test', 'unused.js'],
+    message: /either --bench or --test can be used, not both/,
+  },
+]) {
+  const result = spawnBench(args);
+  assert.notStrictEqual(result.status, 0);
+  assert.match(result.stderr, message);
+}
@@ -0,0 +1,62 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const { spawnSync } = require('child_process');
+const fixtures = require('../common/fixtures');
+
+const spawnTimeout = common.platformTimeout(30_000);
+
+function spawnNode(args, options = undefined) {
+  const result = spawnSync(process.execPath, args, {
+    __proto__: null,
+    encoding: 'utf8',
+    timeout: spawnTimeout,
+    ...options,
+  });
+  assert.ifError(result.error);
+  assert.strictEqual(result.signal, null);
+  return result;
+}
+
+function spawnBench(args, options = undefined) {
+  return spawnNode(['--no-warnings', '--bench', ...args], options);
+}
+
+function parseRecords(result) {
+  assert.strictEqual(result.stderr, '');
+  return parseOutput(result.stdout);
+}
+
+function parseOutput(output) {
+  return output.trim().split('\n').map((line) => JSON.parse(line));
+}
+
+{
+  const result = spawnBench([
+    `--bench-reporter=${fixtures.fileURL('bench-runner/slow-reporter.cjs')}`,
+    fixtures.path('bench-runner/many-records.cjs'),
+  ]);
+  assert.strictEqual(result.status, 0);
+  assert.strictEqual(result.stderr, '');
+  const report = JSON.parse(result.stdout);
+  assert.strictEqual(report.samples, 30);
+  assert.strictEqual(report.stdout,
+                     Array.from({ length: 30 }, (_, i) => `${i}\n`).join(''));
+}
+
+{
+  const result = spawnBench([
+    '--bench-reporter=json',
+    fixtures.path('bench-runner/acknowledged-records.mjs'),
+  ]);
+  assert.strictEqual(result.status, 0);
+  assert.strictEqual(result.stderr, '');
+  const records = parseRecords(result);
+  const diagnostics = records.filter(
+    ({ type }) => type === 'bench:diagnostic');
+  assert.strictEqual(diagnostics.length, 32);
+  assert(diagnostics.every(
+    ({ data }) => /^acknowledged 10\d{3}$/.test(data.message)));
+  assert.strictEqual(records.at(-1).data.success, true);
+}