test: try to stabalize test-child-process-fork-exec-path.js

PR-URL: #27277
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>

test/parallel/test-child-process-fork-exec-path.js

@@ -21,45 +21,41 @@
 
 'use strict';
 const common = require('../common');
+
+// Test that `fork()` respects the `execPath` option.
+
+const tmpdir = require('../common/tmpdir');
+const { addLibraryPath } = require('../common/shared-lib-util');
 const assert = require('assert');
-const fs = require('fs');
-const { COPYFILE_FICLONE } = fs.constants;
 const path = require('path');
-const tmpdir = require('../common/tmpdir');
+const fs = require('fs');
+const { fork } = require('child_process');
+
 const msg = { test: 'this' };
 const nodePath = process.execPath;
 const copyPath = path.join(tmpdir.path, 'node-copy.exe');
-const { addLibraryPath } = require('../common/shared-lib-util');
 
 addLibraryPath(process.env);
 
+// Child
 if (process.env.FORK) {
-  assert(process.send);
-  assert.strictEqual(process.argv[0], copyPath);
+  assert.strictEqual(process.execPath, copyPath);
+  assert.ok(process.send);
   process.send(msg);
-  process.exit();
-} else {
-  tmpdir.refresh();
-  try {
-    fs.unlinkSync(copyPath);
-  } catch (e) {
-    if (e.code !== 'ENOENT') throw e;
-  }
-  fs.copyFileSync(nodePath, copyPath, COPYFILE_FICLONE);
-  fs.chmodSync(copyPath, '0755');
-
-  // slow but simple
-  const envCopy = JSON.parse(JSON.stringify(process.env));
-  envCopy.FORK = 'true';
-  const child = require('child_process').fork(__filename, {
-    execPath: copyPath,
-    env: envCopy
-  });
-  child.on('message', common.mustCall(function(recv) {
-    assert.deepStrictEqual(msg, recv);
-  }));
-  child.on('exit', common.mustCall(function(code) {
-    fs.unlinkSync(copyPath);
-    assert.strictEqual(code, 0);
-  }));
+  return process.exit();
 }
+
+// Parent
+tmpdir.refresh();
+assert.strictEqual(fs.existsSync(copyPath), false);
+fs.copyFileSync(nodePath, copyPath, fs.constants.COPYFILE_FICLONE);
+fs.chmodSync(copyPath, '0755');
+
+const envCopy = Object.assign({}, process.env, { 'FORK': 'true' });
+const child = fork(__filename, { execPath: copyPath, env: envCopy });
+child.on('message', common.mustCall(function(recv) {
+  assert.deepStrictEqual(recv, msg);
+}));
+child.on('exit', common.mustCall(function(code) {
+  assert.strictEqual(code, 0);
+}));