test: lazily load modules on test runner

test/common/child_process.js

@@ -2,14 +2,14 @@
 
 const assert = require('assert');
 const { spawnSync, execFileSync } = require('child_process');
-const common = require('./');
-const util = require('util');
+const { platformTimeout, isWindows } = require('./');
+let inspect;
 
 // Workaround for Windows Server 2008R2
 // When CMD is used to launch a process and CMD is killed too quickly, the
 // process can stay behind running in suspended state, never completing.
 function cleanupStaleProcess(filename) {
-  if (!common.isWindows) {
+  if (!isWindows) {
     return;
   }
   process.once('beforeExit', () => {
@@ -30,7 +30,7 @@ function cleanupStaleProcess(filename) {
 
 // This should keep the child process running long enough to expire
 // the timeout.
-const kExpiringChildRunTime = common.platformTimeout(20 * 1000);
+const kExpiringChildRunTime = platformTimeout(20 * 1000);
 const kExpiringParentTimer = 1;
 assert(kExpiringChildRunTime > kExpiringParentTimer);
 
@@ -43,17 +43,18 @@ function logAfterTime(time) {
 }
 
 function checkOutput(str, check) {
+  inspect ??= require('util').inspect;
   if ((check instanceof RegExp && !check.test(str)) ||
     (typeof check === 'string' && check !== str)) {
-    return { passed: false, reason: `did not match ${util.inspect(check)}` };
+    return { passed: false, reason: `did not match ${inspect(check)}` };
   }
   if (typeof check === 'function') {
     try {
       check(str);
     } catch (error) {
       return {
         passed: false,
-        reason: `did not match expectation, checker throws:\n${util.inspect(error)}`,
+        reason: `did not match expectation, checker throws:\n${inspect(error)}`,
       };
     }
   }

test/common/crypto.js

@@ -1,20 +1,19 @@
 'use strict';
 
-const common = require('../common');
-if (!common.hasCrypto) {
-  common.skip('missing crypto');
+const { hasCrypto, skip } = require('../common');
+if (!hasCrypto) {
+  skip('missing crypto');
 }
 
 const assert = require('assert');
-const crypto = require('crypto');
 const {
   createSign,
   createVerify,
   publicEncrypt,
   privateDecrypt,
   sign,
   verify,
-} = crypto;
+} = require('crypto');  /* eslint-disable-line node-core/crypto-check */
 
 // The values below (modp2/modp2buf) are for a 1024 bits long prime from
 // RFC 2412 E.2, see https://tools.ietf.org/html/rfc2412. */
@@ -109,7 +108,7 @@ const opensslVersionNumber = (major = 0, minor = 0, patch = 0) => {
 
 let OPENSSL_VERSION_NUMBER;
 const hasOpenSSL = (major = 0, minor = 0, patch = 0) => {
-  if (!common.hasCrypto) return false;
+  if (!hasCrypto) return false;
   if (OPENSSL_VERSION_NUMBER === undefined) {
     const regexp = /(?<m>\d+)\.(?<n>\d+)\.(?<p>\d+)/;
     const { m, n, p } = process.versions.openssl.match(regexp).groups;

test/common/debugger.js

@@ -1,19 +1,19 @@
 'use strict';
-const common = require('../common');
-const spawn = require('child_process').spawn;
+const { isWindows, platformTimeout } = require('../common');
+const { spawn } = require('child_process');
 
 const BREAK_MESSAGE = new RegExp('(?:' + [
   'assert', 'break', 'break on start', 'debugCommand',
   'exception', 'other', 'promiseRejection', 'step',
 ].join('|') + ') in', 'i');
 
 // Some macOS machines require more time to receive the outputs from the client.
-let TIMEOUT = common.platformTimeout(10000);
-if (common.isWindows) {
+let TIMEOUT = platformTimeout(10000);
+if (isWindows) {
   // Some of the windows machines in the CI need more time to receive
   // the outputs from the client.
   // https://github.com/nodejs/build/issues/3014
-  TIMEOUT = common.platformTimeout(15000);
+  TIMEOUT = platformTimeout(15000);
 }
 
 function isPreBreak(output) {

test/common/dns.js

@@ -1,8 +1,8 @@
 'use strict';
 
 const assert = require('assert');
-const os = require('os');
-const { isIP } = require('net');
+let endianness;
+let isIP;
 
 const types = {
   A: 1,
@@ -284,11 +284,13 @@ function writeDNSPacket(parsed) {
     }
   }
 
+  endianness ??= require('os').endianness();
+
   return Buffer.concat(buffers.map((typedArray) => {
     const buf = Buffer.from(typedArray.buffer,
                             typedArray.byteOffset,
                             typedArray.byteLength);
-    if (os.endianness() === 'LE') {
+    if (endianness === 'LE') {
       if (typedArray.BYTES_PER_ELEMENT === 2) buf.swap16();
       if (typedArray.BYTES_PER_ELEMENT === 4) buf.swap32();
     }
@@ -311,6 +313,7 @@ function errorLookupMock(code = mockedErrorCode, syscall = mockedSysCall) {
 }
 
 function createMockedLookup(...addresses) {
+  isIP ??= require('net').isIP;
   addresses = addresses.map((address) => ({ address: address, family: isIP(address) }));
 
   // Create a DNS server which replies with a AAAA and a A record for the same host

test/common/heap.js

@@ -1,6 +1,6 @@
 'use strict';
 const assert = require('assert');
-const util = require('util');
+const { inspect } = require('util');
 
 let _buildEmbedderGraph;
 function buildEmbedderGraph() {
@@ -91,7 +91,7 @@ function readHeapInfo(raw, fields, types, strings) {
 }
 
 function inspectNode(snapshot) {
-  return util.inspect(snapshot, { depth: 4 });
+  return inspect(snapshot, { depth: 4 });
 }
 
 function isEdge(edge, { node_name, edge_name }) {
@@ -144,7 +144,7 @@ class State {
           if (!hasChild) {
             throw new Error(
               'expected to find child ' +
-              `${util.inspect(expectedEdge)} in ${inspectNode(rootNodes)}`);
+              `${inspect(expectedEdge)} in ${inspectNode(rootNodes)}`);
           }
         }
       }
@@ -196,7 +196,7 @@ class State {
           if (!hasChild) {
             throw new Error(
               'expected to find child ' +
-              `${util.inspect(expectedEdge)} in ${inspectNode(rootNodes)}`);
+              `${inspect(expectedEdge)} in ${inspectNode(rootNodes)}`);
           }
         }
       }
@@ -269,7 +269,7 @@ function findByRetainingPath(rootName, retainingPath) {
     }
 
     if (newHaystack.length === 0) {
-      const format = (val) => util.inspect(val, { breakLength: 128, depth: 3 });
+      const format = (val) => inspect(val, { breakLength: 128, depth: 3 });
       console.error('#');
       console.error('# Retaining path to search for:');
       for (let j = 0; j < retainingPath.length; ++j) {

test/common/index.js

@@ -24,7 +24,10 @@ const process = globalThis.process;  // Some tests tamper with the process globa
 
 const assert = require('assert');
 const fs = require('fs');
-const net = require('net');
+const {
+  getDefaultAutoSelectFamilyAttemptTimeout,
+  setDefaultAutoSelectFamilyAttemptTimeout,
+} = require('net');
 // Do not require 'os' until needed so that test-os-checked-function can
 // monkey patch it. If 'os' is required here, that test will fail.
 const path = require('path');
@@ -139,8 +142,8 @@ function isPi() {
 }
 
 // When using high concurrency or in the CI we need much more time for each connection attempt
-net.setDefaultAutoSelectFamilyAttemptTimeout(platformTimeout(net.getDefaultAutoSelectFamilyAttemptTimeout() * 10));
-const defaultAutoSelectFamilyAttemptTimeout = net.getDefaultAutoSelectFamilyAttemptTimeout();
+const defaultAutoSelectFamilyAttemptTimeout = platformTimeout(getDefaultAutoSelectFamilyAttemptTimeout() * 10);
+setDefaultAutoSelectFamilyAttemptTimeout(defaultAutoSelectFamilyAttemptTimeout);
 
 const buildType = process.config.target_defaults ?
   process.config.target_defaults.default_configuration :

test/common/inspector-helper.js

@@ -5,7 +5,7 @@ const fs = require('fs');
 const http = require('http');
 const fixtures = require('../common/fixtures');
 const { spawn } = require('child_process');
-const { URL, pathToFileURL } = require('url');
+const { pathToFileURL } = require('url');
 const { EventEmitter, once } = require('events');
 
 const _MAINSCRIPT = fixtures.path('loop.js');

test/common/measure-memory.js

@@ -1,7 +1,7 @@
 'use strict';
 
 const assert = require('assert');
-const common = require('./');
+let expectWarning;
 
 // The formats could change when V8 is updated, then the tests should be
 // updated accordingly.
@@ -43,7 +43,8 @@ function assertSingleDetailedShape(result) {
 }
 
 function expectExperimentalWarning() {
-  common.expectWarning(
+  expectWarning ??= require('./').expectWarning;
+  expectWarning(
     'ExperimentalWarning',
     'vm.measureMemory is an experimental feature and might change at any time',
   );

test/common/net.js

@@ -1,11 +1,11 @@
 'use strict';
-const net = require('net');
-
 const options = { port: 0, reusePort: true };
+let createServer;
 
 function checkSupportReusePort() {
+  createServer ??= require('net').createServer;
   return new Promise((resolve, reject) => {
-    const server = net.createServer().listen(options);
+    const server = createServer().listen(options);
     server.on('listening', () => {
       server.close(resolve);
     });

test/common/tls.js

@@ -2,11 +2,11 @@
 
 'use strict';
 const crypto = require('crypto');
-const net = require('net');
+const { Socket } = require('net');
 
 exports.ccs = Buffer.from('140303000101', 'hex');
 
-class TestTLSSocket extends net.Socket {
+class TestTLSSocket extends Socket {
   constructor(server_cert) {
     super();
     this.server_cert = server_cert;

test/common/udp.js

@@ -1,21 +1,21 @@
 'use strict';
-const dgram = require('dgram');
+const { createSocket } = require('dgram');
 
 const options = { type: 'udp4', reusePort: true };
 
 function checkSupportReusePort() {
-  return new Promise((resolve, reject) => {
-    const socket = dgram.createSocket(options);
-    socket.bind(0);
-    socket.on('listening', () => {
-      socket.close(resolve);
-    });
-    socket.on('error', (err) => {
-      console.log('The `reusePort` option is not supported:', err.message);
-      socket.close();
-      reject(err);
-    });
+  const { promise, resolve, reject } = Promise.withResolvers();
+  const socket = createSocket(options);
+  socket.bind(0);
+  socket.on('listening', () => {
+    socket.close(resolve);
   });
+  socket.on('error', (err) => {
+    console.log('The `reusePort` option is not supported:', err.message);
+    socket.close();
+    reject(err);
+  });
+  return promise;
 }
 
 module.exports = {

test/common/v8.js

@@ -1,15 +1,16 @@
 'use strict';
 const assert = require('assert');
-const { GCProfiler } = require('v8');
+let GCProfiler;
 
 function collectGCProfile({ duration }) {
-  return new Promise((resolve) => {
-    const profiler = new GCProfiler();
-    profiler.start();
-    setTimeout(() => {
-      resolve(profiler.stop());
-    }, duration);
-  });
+  GCProfiler ??= require('v8').GCProfiler;
+  const { promise, resolve } = Promise.withResolvers();
+  const profiler = new GCProfiler();
+  profiler.start();
+  setTimeout(() => {
+    resolve(profiler.stop());
+  }, duration);
+  return promise;
 }
 
 function checkGCProfile(data) {

test/common/wpt.js

@@ -6,12 +6,13 @@ const fs = require('fs');
 const fsPromises = fs.promises;
 const path = require('path');
 const events = require('events');
-const os = require('os');
 const { inspect } = require('util');
 const { Worker } = require('worker_threads');
 
 const workerPath = path.join(__dirname, 'wpt/worker.js');
 
+let osType;
+
 function getBrowserProperties() {
   const { node: version } = process.versions; // e.g. 18.13.0, 20.0.0-nightly202302078e6e215481
   const release = /^\d+\.\d+\.\d+$/.test(version);
@@ -28,7 +29,8 @@ function getBrowserProperties() {
  * https://github.com/web-platform-tests/wpt/blob/1c6ff12/tools/wptrunner/wptrunner/tests/test_update.py#L953-L958
  */
 function getOs() {
-  switch (os.type()) {
+  osType ??= require('os').type();
+  switch (osType) {
     case 'Linux':
       return 'linux';
     case 'Darwin':
@@ -512,10 +514,10 @@ const limit = (concurrency) => {
 };
 
 class WPTRunner {
-  constructor(path, { concurrency = os.availableParallelism() - 1 || 1 } = {}) {
+  constructor(path, { concurrency } = {}) {
     this.path = path;
     this.resource = new ResourceLoader(path);
-    this.concurrency = concurrency;
+    this.concurrency = concurrency ?? (require('os').availableParallelism() - 1 || 1);
 
     this.flags = [];
     this.globalThisInitScripts = [];