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: #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>

Author: addaleax

test/async-hooks/init-hooks.js

@@ -1,7 +1,7 @@
 'use strict';
 // Flags: --expose-gc
 
-require('../common');
+const common = require('../common');
 const assert = require('assert');
 const async_hooks = require('async_hooks');
 const util = require('util');
@@ -162,6 +162,10 @@ class ActivityCollector {
         const stub = { uid, type: 'Unknown', handleIsObject: true };
         this._activities.set(uid, stub);
         return stub;
+      } else if (!common.isMainThread) {
+        // Worker threads start main script execution inside of an AsyncWrap
+        // callback, so we don't yield errors for these.
+        return null;
       } else {
         const err = new Error(`Found a handle whose ${hook}` +
                               ' hook was invoked but not its init hook');

test/async-hooks/test-crypto-pbkdf2.js

@@ -3,6 +3,8 @@
 const common = require('../common');
 if (!common.hasCrypto)
   common.skip('missing crypto');
+if (!common.isMainThread)
+  common.skip('Worker bootstrapping works differently -> different async IDs');
 
 const assert = require('assert');
 const tick = require('./tick');

test/async-hooks/test-crypto-randomBytes.js

@@ -3,6 +3,8 @@
 const common = require('../common');
 if (!common.hasCrypto)
   common.skip('missing crypto');
+if (!common.isMainThread)
+  common.skip('Worker bootstrapping works differently -> different async IDs');
 
 const assert = require('assert');
 const tick = require('./tick');

test/async-hooks/test-emit-before-after.js

@@ -7,6 +7,9 @@ const spawnSync = require('child_process').spawnSync;
 const async_hooks = require('internal/async_hooks');
 const initHooks = require('./init-hooks');
 
+if (!common.isMainThread)
+  common.skip('Worker bootstrapping works differently -> different async IDs');
+
 switch (process.argv[2]) {
   case 'test_invalid_async_id':
     async_hooks.emitBefore(-2, 1);

test/async-hooks/test-enable-disable.js

@@ -88,6 +88,10 @@ const assert = require('assert');
 const tick = require('./tick');
 const initHooks = require('./init-hooks');
 const { checkInvocations } = require('./hook-checks');
+
+if (!common.isMainThread)
+  common.skip('Worker bootstrapping works differently -> different timing');
+
 // Include "Unknown"s because hook2 will not be able to identify
 // the type of the first Immediate  since it will miss its `init` invocation.
 const types = [ 'Immediate', 'Unknown' ];

test/async-hooks/test-fseventwrap.js

@@ -1,12 +1,15 @@
 'use strict';
-require('../common');
+const common = require('../common');
 
 const assert = require('assert');
 const initHooks = require('./init-hooks');
 const tick = require('./tick');
 const { checkInvocations } = require('./hook-checks');
 const fs = require('fs');
 
+if (!common.isMainThread)
+  common.skip('Worker bootstrapping works differently -> different async IDs');
+
 const hooks = initHooks();
 
 hooks.enable();

test/async-hooks/test-fsreqwrap-readFile.js

@@ -7,6 +7,9 @@ const initHooks = require('./init-hooks');
 const { checkInvocations } = require('./hook-checks');
 const fs = require('fs');
 
+if (!common.isMainThread)
+  common.skip('Worker bootstrapping works differently -> different async IDs');
+
 const hooks = initHooks();
 
 hooks.enable();

test/async-hooks/test-getaddrinforeqwrap.js

@@ -7,6 +7,9 @@ const initHooks = require('./init-hooks');
 const { checkInvocations } = require('./hook-checks');
 const dns = require('dns');
 
+if (!common.isMainThread)
+  common.skip('Worker bootstrapping works differently -> different async IDs');
+
 const hooks = initHooks();
 
 hooks.enable();

test/async-hooks/test-getnameinforeqwrap.js

@@ -7,6 +7,9 @@ const initHooks = require('./init-hooks');
 const { checkInvocations } = require('./hook-checks');
 const dns = require('dns');
 
+if (!common.isMainThread)
+  common.skip('Worker bootstrapping works differently -> different async IDs');
+
 const hooks = initHooks();
 
 hooks.enable();

test/async-hooks/test-graph.signal.js

@@ -1,9 +1,10 @@
 'use strict';
 
 const common = require('../common');
-if (common.isWindows) {
+if (common.isWindows)
   common.skip('no signals on Windows');
-}
+if (!common.isMainThread)
+  common.skip('No signal handling available in Workers');
 
 const initHooks = require('./init-hooks');
 const verifyGraph = require('./verify-graph');