test,tools: enable running tests under workers

Enable running tests inside workers by passing `--worker`
to `tools/test.py`. A number of tests are marked as skipped,
or have been slightly altered to fit the different environment.

PR-URL: https://github.com/nodejs/node/pull/20876
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Shingo Inoue <leko.noor@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: John-David Dalton <john.david.dalton@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>

2 files changed, 18 insertions, 0 deletions

diff --git a/tools/run-worker.js b/tools/run-worker.js
new file mode 100644
index 0000000000..a9dd773ecf
--- /dev/null
+++ b/tools/run-worker.js
@@ -0,0 +1,11 @@
+'use strict';
+if (typeof require === 'undefined') {
+  console.log('1..0 # Skipped: Not being run as CommonJS');
+  process.exit(0);
+}
+
+const path = require('path');
+const { Worker } = require('worker');
+
+new Worker(path.resolve(process.cwd(), process.argv[2]))
+  .on('exit', (code) => process.exitCode = code);
diff --git a/tools/test.py b/tools/test.py
index e5581e8da4..27a2722438 100755
--- a/tools/test.py
+++ b/tools/test.py
@@ -1375,6 +1375,8 @@ def BuildOptions():
       help="Expect test cases to fail", default=False, action="store_true")
   result.add_option("--valgrind", help="Run tests through valgrind",
       default=False, action="store_true")
+  result.add_option("--worker", help="Run parallel tests inside a worker context",
+      default=False, action="store_true")
   result.add_option("--check-deopts", help="Check tests for permanent deoptimizations",
       default=False, action="store_true")
   result.add_option("--cat", help="Print the source of the tests",
@@ -1617,6 +1619,11 @@ def Main():
     options.node_args.append("--always-opt")
     options.progress = "deopts"
 
+  if options.worker:
+    run_worker = join(workspace, "tools", "run-worker.js")
+    options.node_args.append('--experimental-worker')
+    options.node_args.append(run_worker)
+
   shell = abspath(options.shell)
   buildspace = dirname(shell)