forgot to add the test

Author: cjihrig

test/parallel/test-runner-cli-concurrency.js

@@ -0,0 +1,45 @@
+'use strict';
+const common = require('../common');
+const tmpdir = require('../common/tmpdir');
+const { deepStrictEqual, strictEqual } = require('node:assert');
+const { spawnSync } = require('node:child_process');
+const { readdirSync, writeFileSync } = require('node:fs');
+const { join } = require('node:path');
+const { beforeEach, test } = require('node:test');
+
+function createTestFile(name) {
+  writeFileSync(join(tmpdir.path, name), `
+    const fs = require('node:fs');
+
+    fs.unlinkSync(__filename);
+    setTimeout(() => {}, 1_000_000_000);
+  `);
+}
+
+beforeEach(() => {
+  tmpdir.refresh();
+  createTestFile('test-1.js');
+  createTestFile('test-2.js');
+});
+
+test('concurrency of one', () => {
+  const cp = spawnSync(process.execPath, ['--test', '--test-concurrency=1'], {
+    cwd: tmpdir.path,
+    timeout: common.platformTimeout(1000),
+  });
+
+  strictEqual(cp.stderr.toString(), '');
+  strictEqual(cp.error.code, 'ETIMEDOUT');
+  deepStrictEqual(readdirSync(tmpdir.path), ['test-2.js']);
+});
+
+test('concurrency of two', () => {
+  const cp = spawnSync(process.execPath, ['--test', '--test-concurrency=2'], {
+    cwd: tmpdir.path,
+    timeout: common.platformTimeout(1000),
+  });
+
+  strictEqual(cp.stderr.toString(), '');
+  strictEqual(cp.error.code, 'ETIMEDOUT');
+  deepStrictEqual(readdirSync(tmpdir.path), []);
+});