test: rename regression tests file names

Rename the tests appropriately alongside mentioning the subsystem.
Also, make a few basic changes to make sure the tests conform to the
standard test structure.

- Rename test-regress-GH-io-1068 to test-tty-stdin-end
- Rename test-regress-GH-io-1811 to test-zlib-kmaxlength-rangeerror
- Rename test-regress-GH-node-9326 to test-kill-segfault-freebsd
- Rename test-timers-regress-GH-9765 to test-timers-setimmediate-infinite-loop
- Rename test-tls-pfx-gh-5100-regr to test-tls-pfx-authorizationerror
- Rename test-tls-regr-gh-5108 to test-tls-tlswrap-segfault

PR-URL: https://github.com/nodejs/node/pull/19332
Fixes: https://github.com/nodejs/node/issues/19105
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Shingo Inoue <leko.noor@gmail.com>

test/parallel/test-kill-segfault-freebsd.js

@@ -1,5 +1,10 @@
 'use strict';
 require('../common');
+
+// This test ensures Node.js doesn't crash on hitting Ctrl+C in order to
+// terminate the currently running process (especially on FreeBSD).
+// https://github.com/nodejs/node-v0.x-archive/issues/9326
+
 const assert = require('assert');
 const child_process = require('child_process');
 

test/parallel/test-regress-GH-io-1068.js

@@ -1,3 +0,0 @@
-'use strict';
-require('../common');
-process.stdin.emit('end');

test/parallel/test-tls-pfx-authorizationerror.js

@@ -0,0 +1,42 @@
+'use strict';
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('node compiled without crypto.');
+const fixtures = require('../common/fixtures');
+
+// This test ensures that TLS does not fail to read a self-signed certificate
+// and thus throw an `authorizationError`.
+// https://github.com/nodejs/node/issues/5100
+
+const assert = require('assert');
+const tls = require('tls');
+
+const pfx = fixtures.readKey('agent1-pfx.pem');
+
+const server = tls
+  .createServer(
+    {
+      pfx: pfx,
+      passphrase: 'sample',
+      requestCert: true,
+      rejectUnauthorized: false
+    },
+    common.mustCall(function(c) {
+      assert.strictEqual(c.authorizationError, null);
+      c.end();
+    })
+  )
+  .listen(0, function() {
+    const client = tls.connect(
+      {
+        port: this.address().port,
+        pfx: pfx,
+        passphrase: 'sample',
+        rejectUnauthorized: false
+      },
+      function() {
+        client.end();
+        server.close();
+      }
+    );
+  });

test/parallel/test-tls-pfx-gh-5100-regr.js

@@ -1,32 +0,0 @@
-'use strict';
-
-const common = require('../common');
-
-if (!common.hasCrypto)
-  common.skip('node compiled without crypto.');
-
-const assert = require('assert');
-const tls = require('tls');
-const fixtures = require('../common/fixtures');
-
-const pfx = fixtures.readKey('agent1-pfx.pem');
-
-const server = tls.createServer({
-  pfx: pfx,
-  passphrase: 'sample',
-  requestCert: true,
-  rejectUnauthorized: false
-}, common.mustCall(function(c) {
-  assert.strictEqual(c.authorizationError, null);
-  c.end();
-})).listen(0, function() {
-  const client = tls.connect({
-    port: this.address().port,
-    pfx: pfx,
-    passphrase: 'sample',
-    rejectUnauthorized: false
-  }, function() {
-    client.end();
-    server.close();
-  });
-});

test/parallel/test-tls-tlswrap-segfault.js

@@ -1,19 +1,21 @@
 'use strict';
 const common = require('../common');
-
 if (!common.hasCrypto)
   common.skip('missing crypto');
+const fixtures = require('../common/fixtures');
+
+// This test ensures that Node.js doesn't incur a segfault while accessing
+// TLSWrap fields after the parent handle was destroyed.
+// https://github.com/nodejs/node/issues/5108
 
 const assert = require('assert');
 const tls = require('tls');
-const fixtures = require('../common/fixtures');
 
 const options = {
   key: fixtures.readKey('agent1-key.pem'),
   cert: fixtures.readKey('agent1-cert.pem')
 };
 
-
 const server = tls.createServer(options, function(s) {
   s.end('hello');
 }).listen(0, function() {
@@ -26,7 +28,6 @@ const server = tls.createServer(options, function(s) {
   });
 });
 
-
 function putImmediate(client) {
   setImmediate(function() {
     if (client.ssl) {

test/parallel/test-tty-stdin-end.js

@@ -0,0 +1,7 @@
+'use strict';
+require('../common');
+
+// This test ensures that Node.js doesn't crash on `process.stdin.emit("end")`.
+// https://github.com/nodejs/node/issues/1068
+
+process.stdin.emit('end');

test/parallel/test-zlib-kmaxlength-rangeerror.js

@@ -1,6 +1,10 @@
 'use strict';
-
 require('../common');
+
+// This test ensures that zlib throws a RangeError if the final buffer needs to
+// be larger than kMaxLength and concatenation fails.
+// https://github.com/nodejs/node/pull/1811
+
 const assert = require('assert');
 
 // Change kMaxLength for zlib to trigger the error without having to allocate