test: use common.isWindows consistently

In the tests, we use "process.platform === 'win32'" in some places.
This patch replaces them with the "common.isWindows" for consistency.

PR-URL: https://github.com/nodejs/io.js/pull/2269
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

66 files changed, 114 insertions, 132 deletions

diff --git a/test/common.js b/test/common.js
index 1a56449917..1ad66cff0b 100644
--- a/test/common.js
+++ b/test/common.js
@@ -119,7 +119,7 @@ Object.defineProperty(exports, 'opensslCli', {get: function() {
     opensslCli = path.join(path.dirname(process.execPath), 'openssl-cli');
   }
 
-  if (process.platform === 'win32') opensslCli += '.exe';
+  if (exports.isWindows) opensslCli += '.exe';
 
   var openssl_cmd = child_process.spawnSync(opensslCli, ['version']);
   if (openssl_cmd.status !== 0 || openssl_cmd.error !== undefined) {
@@ -133,7 +133,7 @@ Object.defineProperty(exports, 'hasCrypto', {get: function() {
   return process.versions.openssl ? true : false;
 }});
 
-if (process.platform === 'win32') {
+if (exports.isWindows) {
   exports.PIPE = '\\\\.\\pipe\\libuv-test';
 } else {
   exports.PIPE = exports.tmpDir + '/test.sock';
@@ -150,7 +150,7 @@ if (process.env.NODE_COMMON_PIPE) {
   }
 }
 
-if (process.platform === 'win32') {
+if (exports.isWindows) {
   exports.faketimeCli = false;
 } else {
   exports.faketimeCli = path.join(__dirname, '..', 'tools', 'faketime', 'src',
@@ -183,7 +183,7 @@ exports.indirectInstanceOf = function(obj, cls) {
 
 
 exports.ddCommand = function(filename, kilobytes) {
-  if (process.platform === 'win32') {
+  if (exports.isWindows) {
     var p = path.resolve(exports.fixturesDir, 'create-file.js');
     return '"' + process.argv[0] + '" "' + p + '" "' +
            filename + '" ' + (kilobytes * 1024);
@@ -196,7 +196,7 @@ exports.ddCommand = function(filename, kilobytes) {
 exports.spawnCat = function(options) {
   var spawn = require('child_process').spawn;
 
-  if (process.platform === 'win32') {
+  if (exports.isWindows) {
     return spawn('more', [], options);
   } else {
     return spawn('cat', [], options);
@@ -207,7 +207,7 @@ exports.spawnCat = function(options) {
 exports.spawnSyncCat = function(options) {
   var spawnSync = require('child_process').spawnSync;
 
-  if (process.platform === 'win32') {
+  if (exports.isWindows) {
     return spawnSync('more', [], options);
   } else {
     return spawnSync('cat', [], options);
@@ -218,7 +218,7 @@ exports.spawnSyncCat = function(options) {
 exports.spawnPwd = function(options) {
   var spawn = require('child_process').spawn;
 
-  if (process.platform === 'win32') {
+  if (exports.isWindows) {
     return spawn('cmd.exe', ['/c', 'cd'], options);
   } else {
     return spawn('pwd', [], options);
@@ -374,7 +374,7 @@ exports.checkSpawnSyncRet = function(ret) {
 };
 
 var etcServicesFileName = path.join('/etc', 'services');
-if (process.platform === 'win32') {
+if (exports.isWindows) {
   etcServicesFileName = path.join(process.env.SystemRoot, 'System32', 'drivers',
     'etc', 'services');
 }
diff --git a/test/parallel/test-c-ares.js b/test/parallel/test-c-ares.js
index 739c3256fb..b7802881f8 100644
--- a/test/parallel/test-c-ares.js
+++ b/test/parallel/test-c-ares.js
@@ -30,7 +30,7 @@ assert.throws(function() {
 // Windows doesn't usually have an entry for localhost 127.0.0.1 in
 // C:\Windows\System32\drivers\etc\hosts
 // so we disable this test on Windows.
-if (process.platform != 'win32') {
+if (!common.isWindows) {
   dns.resolve('127.0.0.1', 'PTR', function(error, domains) {
     if (error) throw error;
     assert.ok(Array.isArray(domains));
diff --git a/test/parallel/test-child-process-cwd.js b/test/parallel/test-child-process-cwd.js
index 5d3f0d9496..e0e83b6007 100644
--- a/test/parallel/test-child-process-cwd.js
+++ b/test/parallel/test-child-process-cwd.js
@@ -38,7 +38,7 @@ function testCwd(options, forCode, forData) {
 }
 
 // Assume these exist, and 'pwd' gives us the right directory back
-if (process.platform == 'win32') {
+if (common.isWindows) {
   testCwd({cwd: process.env.windir}, 0, process.env.windir);
   testCwd({cwd: 'c:\\'}, 0, 'c:\\');
 } else {
diff --git a/test/parallel/test-child-process-default-options.js b/test/parallel/test-child-process-default-options.js
index 93165ded6d..f11a2678f6 100644
--- a/test/parallel/test-child-process-default-options.js
+++ b/test/parallel/test-child-process-default-options.js
@@ -4,11 +4,9 @@ var assert = require('assert');
 
 var spawn = require('child_process').spawn;
 
-var isWindows = process.platform === 'win32';
-
 process.env.HELLO = 'WORLD';
 
-if (isWindows) {
+if (common.isWindows) {
   var child = spawn('cmd.exe', ['/c', 'set'], {});
 } else {
   var child = spawn('/usr/bin/env', [], {});
diff --git a/test/parallel/test-child-process-double-pipe.js b/test/parallel/test-child-process-double-pipe.js
index 41f49bb7a8..b791d4164d 100644
--- a/test/parallel/test-child-process-double-pipe.js
+++ b/test/parallel/test-child-process-double-pipe.js
@@ -1,6 +1,4 @@
 'use strict';
-var is_windows = process.platform === 'win32';
-
 var common = require('../common');
 var assert = require('assert'),
     os = require('os'),
@@ -12,7 +10,7 @@ var assert = require('assert'),
 
 var grep, sed, echo;
 
-if (is_windows) {
+if (common.isWindows) {
   grep = spawn('grep', ['--binary', 'o']),
   sed = spawn('sed', ['--binary', 's/o/O/']),
   echo = spawn('cmd.exe',
diff --git a/test/parallel/test-child-process-env.js b/test/parallel/test-child-process-env.js
index 6f2051f128..1374c2332c 100644
--- a/test/parallel/test-child-process-env.js
+++ b/test/parallel/test-child-process-env.js
@@ -4,8 +4,6 @@ var assert = require('assert');
 
 var spawn = require('child_process').spawn;
 
-var isWindows = process.platform === 'win32';
-
 var env = {
   'HELLO': 'WORLD'
 };
@@ -13,7 +11,7 @@ env.__proto__ = {
   'FOO': 'BAR'
 };
 
-if (isWindows) {
+if (common.isWindows) {
   var child = spawn('cmd.exe', ['/c', 'set'], {env: env});
 } else {
   var child = spawn('/usr/bin/env', [], {env: env});
diff --git a/test/parallel/test-child-process-exec-cwd.js b/test/parallel/test-child-process-exec-cwd.js
index 9e7039990e..e253399b96 100644
--- a/test/parallel/test-child-process-exec-cwd.js
+++ b/test/parallel/test-child-process-exec-cwd.js
@@ -1,5 +1,5 @@
 'use strict';
-require('../common');
+const common = require('../common');
 var assert = require('assert');
 var exec = require('child_process').exec;
 
@@ -8,7 +8,7 @@ var error_count = 0;
 
 var pwdcommand, dir;
 
-if (process.platform == 'win32') {
+if (common.isWindows) {
   pwdcommand = 'echo %cd%';
   dir = 'c:\\windows';
 } else {
diff --git a/test/parallel/test-child-process-exec-env.js b/test/parallel/test-child-process-exec-env.js
index eb554b459c..e80531e87e 100644
--- a/test/parallel/test-child-process-exec-env.js
+++ b/test/parallel/test-child-process-exec-env.js
@@ -20,7 +20,7 @@ function after(err, stdout, stderr) {
   }
 }
 
-if (process.platform !== 'win32') {
+if (!common.isWindows) {
   child = exec('/usr/bin/env', { env: { 'HELLO': 'WORLD' } }, after);
 } else {
   child = exec('set', { env: { 'HELLO': 'WORLD' } }, after);
diff --git a/test/parallel/test-child-process-exec-error.js b/test/parallel/test-child-process-exec-error.js
index b141fc3f2c..416eb16514 100644
--- a/test/parallel/test-child-process-exec-error.js
+++ b/test/parallel/test-child-process-exec-error.js
@@ -17,7 +17,7 @@ function test(fun, code) {
   });
 }
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   test(child_process.exec, 1); // exit code of cmd.exe
 } else {
   test(child_process.exec, 127); // exit code of /bin/sh
diff --git a/test/parallel/test-child-process-fork-dgram.js b/test/parallel/test-child-process-fork-dgram.js
index 8858966fde..8676481a17 100644
--- a/test/parallel/test-child-process-fork-dgram.js
+++ b/test/parallel/test-child-process-fork-dgram.js
@@ -18,7 +18,7 @@ var fork = require('child_process').fork;
 var assert = require('assert');
 var common = require('../common');
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.error('Sending dgram sockets to child processes not supported');
   process.exit(0);
 }
diff --git a/test/parallel/test-child-process-kill.js b/test/parallel/test-child-process-kill.js
index 948348add4..745816bb68 100644
--- a/test/parallel/test-child-process-kill.js
+++ b/test/parallel/test-child-process-kill.js
@@ -4,14 +4,12 @@ var assert = require('assert');
 
 var spawn = require('child_process').spawn;
 
-var is_windows = process.platform === 'win32';
-
 var exitCode;
 var termSignal;
 var gotStdoutEOF = false;
 var gotStderrEOF = false;
 
-var cat = spawn(is_windows ? 'cmd' : 'cat');
+var cat = spawn(common.isWindows ? 'cmd' : 'cat');
 
 
 cat.stdout.on('end', function() {
diff --git a/test/parallel/test-child-process-spawn-typeerror.js b/test/parallel/test-child-process-spawn-typeerror.js
index 35c190353b..348ab2491d 100644
--- a/test/parallel/test-child-process-spawn-typeerror.js
+++ b/test/parallel/test-child-process-spawn-typeerror.js
@@ -2,7 +2,7 @@
 var assert = require('assert');
 var child_process = require('child_process');
 var spawn = child_process.spawn;
-var cmd = (process.platform === 'win32') ? 'rundll32' : 'ls';
+var cmd = require('../common').isWindows ? 'rundll32' : 'ls';
 var invalidArgsMsg = /Incorrect value of args option/;
 var invalidOptionsMsg = /options argument must be an object/;
 
diff --git a/test/parallel/test-child-process-spawnsync.js b/test/parallel/test-child-process-spawnsync.js
index b6f4d31b5c..619cfb7a9d 100644
--- a/test/parallel/test-child-process-spawnsync.js
+++ b/test/parallel/test-child-process-spawnsync.js
@@ -38,7 +38,7 @@ assert.deepEqual(ret_err.spawnargs, ['bar']);
   var response;
   var cwd;
 
-  if (process.platform === 'win32') {
+  if (common.isWindows) {
     cwd = 'c:\\';
     response = spawnSync('cmd.exe', ['/c', 'cd'], {cwd: cwd});
   } else {
diff --git a/test/parallel/test-child-process-stdin.js b/test/parallel/test-child-process-stdin.js
index ba3ef0e0c1..c12b245793 100644
--- a/test/parallel/test-child-process-stdin.js
+++ b/test/parallel/test-child-process-stdin.js
@@ -3,9 +3,8 @@ var common = require('../common');
 var assert = require('assert');
 
 var spawn = require('child_process').spawn;
-var is_windows = process.platform === 'win32';
 
-var cat = spawn(is_windows ? 'more' : 'cat');
+var cat = spawn(common.isWindows ? 'more' : 'cat');
 cat.stdin.write('hello');
 cat.stdin.write(' ');
 cat.stdin.write('world');
@@ -51,7 +50,7 @@ cat.on('exit', function(status) {
 
 cat.on('close', function() {
   closed = true;
-  if (is_windows) {
+  if (common.isWindows) {
     assert.equal('hello world\r\n', response);
   } else {
     assert.equal('hello world', response);
@@ -61,7 +60,7 @@ cat.on('close', function() {
 process.on('exit', function() {
   assert.equal(0, exitStatus);
   assert(closed);
-  if (is_windows) {
+  if (common.isWindows) {
     assert.equal('hello world\r\n', response);
   } else {
     assert.equal('hello world', response);
diff --git a/test/parallel/test-cluster-bind-privileged-port.js b/test/parallel/test-cluster-bind-privileged-port.js
index 6bb83efe5c..0e1e7e244c 100644
--- a/test/parallel/test-cluster-bind-privileged-port.js
+++ b/test/parallel/test-cluster-bind-privileged-port.js
@@ -4,7 +4,7 @@ var assert = require('assert');
 var cluster = require('cluster');
 var net = require('net');
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.log('1..0 # Skipped: not reliable on Windows.');
   return;
 }
diff --git a/test/parallel/test-cluster-dgram-1.js b/test/parallel/test-cluster-dgram-1.js
index bccc39637b..b0db72b129 100644
--- a/test/parallel/test-cluster-dgram-1.js
+++ b/test/parallel/test-cluster-dgram-1.js
@@ -8,7 +8,7 @@ var common = require('../common');
 var dgram = require('dgram');
 
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.warn('dgram clustering is currently not supported on windows.');
   process.exit(0);
 }
diff --git a/test/parallel/test-cluster-dgram-2.js b/test/parallel/test-cluster-dgram-2.js
index db4f986f2d..016a836227 100644
--- a/test/parallel/test-cluster-dgram-2.js
+++ b/test/parallel/test-cluster-dgram-2.js
@@ -8,7 +8,7 @@ var common = require('../common');
 var dgram = require('dgram');
 
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.warn('dgram clustering is currently not supported on windows.');
   process.exit(0);
 }
diff --git a/test/parallel/test-cluster-disconnect-unshared-udp.js b/test/parallel/test-cluster-disconnect-unshared-udp.js
index 0d3eb2a5ad..2547ffae1f 100644
--- a/test/parallel/test-cluster-disconnect-unshared-udp.js
+++ b/test/parallel/test-cluster-disconnect-unshared-udp.js
@@ -1,5 +1,8 @@
 'use strict';
-if (process.platform === 'win32') {
+
+const common = require('../common');
+
+if (common.isWindows) {
   console.log('1..0 # Skipped: on windows, because clustered dgram is ENOTSUP');
   return;
 }
diff --git a/test/parallel/test-cluster-http-pipe.js b/test/parallel/test-cluster-http-pipe.js
index 5ae3b138cc..2a968f5645 100644
--- a/test/parallel/test-cluster-http-pipe.js
+++ b/test/parallel/test-cluster-http-pipe.js
@@ -1,14 +1,15 @@
 'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const cluster = require('cluster');
+const http = require('http');
+
 // It is not possible to send pipe handles over the IPC pipe on Windows.
-if (process.platform === 'win32') {
+if (common.isWindows) {
   process.exit(0);
 }
 
-var common = require('../common');
-var assert = require('assert');
-var cluster = require('cluster');
-var http = require('http');
-
 if (cluster.isMaster) {
   common.refreshTmpDir();
   var ok = false;
diff --git a/test/parallel/test-cluster-shared-handle-bind-privileged-port.js b/test/parallel/test-cluster-shared-handle-bind-privileged-port.js
index 188f6fb208..f524d6bda9 100644
--- a/test/parallel/test-cluster-shared-handle-bind-privileged-port.js
+++ b/test/parallel/test-cluster-shared-handle-bind-privileged-port.js
@@ -4,7 +4,7 @@ var assert = require('assert');
 var cluster = require('cluster');
 var net = require('net');
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.log('1..0 # Skipped: not reliable on Windows');
   return;
 }
diff --git a/test/parallel/test-cwd-enoent-repl.js b/test/parallel/test-cwd-enoent-repl.js
index da96c1094d..e902dd6e64 100644
--- a/test/parallel/test-cwd-enoent-repl.js
+++ b/test/parallel/test-cwd-enoent-repl.js
@@ -5,7 +5,7 @@ var fs = require('fs');
 var spawn = require('child_process').spawn;
 
 // Fails with EINVAL on SmartOS, EBUSY on Windows.
-if (process.platform === 'sunos' || process.platform === 'win32') {
+if (process.platform === 'sunos' || common.isWindows) {
   console.log('1..0 # Skipped: cannot rmdir current working directory');
   return;
 }
diff --git a/test/parallel/test-cwd-enoent.js b/test/parallel/test-cwd-enoent.js
index edc64e8665..ebb62c1768 100644
--- a/test/parallel/test-cwd-enoent.js
+++ b/test/parallel/test-cwd-enoent.js
@@ -5,7 +5,7 @@ var fs = require('fs');
 var spawn = require('child_process').spawn;
 
 // Fails with EINVAL on SmartOS, EBUSY on Windows.
-if (process.platform === 'sunos' || process.platform === 'win32') {
+if (process.platform === 'sunos' || common.isWindows) {
   console.log('1..0 # Skipped: cannot rmdir current working directory');
   return;
 }
diff --git a/test/parallel/test-dgram-exclusive-implicit-bind.js b/test/parallel/test-dgram-exclusive-implicit-bind.js
index 077e1812b9..cebb162042 100644
--- a/test/parallel/test-dgram-exclusive-implicit-bind.js
+++ b/test/parallel/test-dgram-exclusive-implicit-bind.js
@@ -39,8 +39,6 @@ var dgram = require('dgram');
 // supported while using cluster, though servers still cause the master to error
 // with ENOTSUP.
 
-var windows = process.platform === 'win32';
-
 if (cluster.isMaster) {
   var pass;
   var messages = 0;
@@ -56,12 +54,12 @@ if (cluster.isMaster) {
     messages++;
     ports[rinfo.port] = true;
 
-    if (windows && messages === 2) {
+    if (common.isWindows && messages === 2) {
       assert.equal(Object.keys(ports).length, 2);
       done();
     }
 
-    if (!windows && messages === 4) {
+    if (!common.isWindows && messages === 4) {
       assert.equal(Object.keys(ports).length, 3);
       done();
     }
@@ -76,7 +74,7 @@ if (cluster.isMaster) {
   target.on('listening', function() {
     cluster.fork();
     cluster.fork();
-    if (!windows) {
+    if (!common.isWindows) {
       cluster.fork({BOUND: 'y'});
       cluster.fork({BOUND: 'y'});
     }
diff --git a/test/parallel/test-fs-access.js b/test/parallel/test-fs-access.js
index 9c586692b8..e25701b0b3 100644
--- a/test/parallel/test-fs-access.js
+++ b/test/parallel/test-fs-access.js
@@ -49,7 +49,7 @@ createFileWithPerms(readWriteFile, 0o666);
  * continuous integration platform to take care of that.
  */
 var hasWriteAccessForReadonlyFile = false;
-if (process.platform !== 'win32' && process.getuid() === 0) {
+if (!common.isWindows && process.getuid() === 0) {
   hasWriteAccessForReadonlyFile = true;
   try {
     process.setuid('nobody');
diff --git a/test/parallel/test-fs-append-file-sync.js b/test/parallel/test-fs-append-file-sync.js
index bb9d243472..b3789ad911 100644
--- a/test/parallel/test-fs-append-file-sync.js
+++ b/test/parallel/test-fs-append-file-sync.js
@@ -62,7 +62,7 @@ var m = 0o600;
 fs.appendFileSync(filename4, num, { mode: m });
 
 // windows permissions aren't unix
-if (process.platform !== 'win32') {
+if (!common.isWindows) {
   var st = fs.statSync(filename4);
   assert.equal(st.mode & 0o700, m);
 }
diff --git a/test/parallel/test-fs-append-file.js b/test/parallel/test-fs-append-file.js
index aa96f86b2b..4951fa85b4 100644
--- a/test/parallel/test-fs-append-file.js
+++ b/test/parallel/test-fs-append-file.js
@@ -91,7 +91,7 @@ fs.appendFile(filename4, n, { mode: m }, function(e) {
   common.error('appended to file4');
 
   // windows permissions aren't unix
-  if (process.platform !== 'win32') {
+  if (!common.isWindows) {
     var st = fs.statSync(filename4);
     assert.equal(st.mode & 0o700, m);
   }
diff --git a/test/parallel/test-fs-chmod.js b/test/parallel/test-fs-chmod.js
index 5d4a8a2b9c..11c8bb6168 100644
--- a/test/parallel/test-fs-chmod.js
+++ b/test/parallel/test-fs-chmod.js
@@ -7,7 +7,6 @@ var got_error = false;
 var success_count = 0;
 var mode_async;
 var mode_sync;
-var is_windows = process.platform === 'win32';
 
 // Need to hijack fs.open/close to make sure that things
 // get closed once they're opened.
@@ -44,7 +43,7 @@ function closeSync() {
 
 
 // On Windows chmod is only able to manipulate read-only bit
-if (is_windows) {
+if (common.isWindows) {
   mode_async = 0o400;   // read-only
   mode_sync = 0o600;    // read-write
 } else {
@@ -61,14 +60,14 @@ fs.chmod(file1, mode_async.toString(8), function(err) {
   } else {
     console.log(fs.statSync(file1).mode);
 
-    if (is_windows) {
+    if (common.isWindows) {
       assert.ok((fs.statSync(file1).mode & 0o777) & mode_async);
     } else {
       assert.equal(mode_async, fs.statSync(file1).mode & 0o777);
     }
 
     fs.chmodSync(file1, mode_sync);
-    if (is_windows) {
+    if (common.isWindows) {
       assert.ok((fs.statSync(file1).mode & 0o777) & mode_sync);
     } else {
       assert.equal(mode_sync, fs.statSync(file1).mode & 0o777);
@@ -89,14 +88,14 @@ fs.open(file2, 'a', function(err, fd) {
     } else {
       console.log(fs.fstatSync(fd).mode);
 
-      if (is_windows) {
+      if (common.isWindows) {
         assert.ok((fs.fstatSync(fd).mode & 0o777) & mode_async);
       } else {
         assert.equal(mode_async, fs.fstatSync(fd).mode & 0o777);
       }
 
       fs.fchmodSync(fd, mode_sync);
-      if (is_windows) {
+      if (common.isWindows) {
         assert.ok((fs.fstatSync(fd).mode & 0o777) & mode_sync);
       } else {
         assert.equal(mode_sync, fs.fstatSync(fd).mode & 0o777);
diff --git a/test/parallel/test-fs-readfile-pipe-large.js b/test/parallel/test-fs-readfile-pipe-large.js
index 99e4bfada8..b24c06dcc0 100644
--- a/test/parallel/test-fs-readfile-pipe-large.js
+++ b/test/parallel/test-fs-readfile-pipe-large.js
@@ -5,7 +5,7 @@ var path = require('path');
 
 // simulate `cat readfile.js | node readfile.js`
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.log('1..0 # Skipped: No /dev/stdin on windows.');
   return;
 }
diff --git a/test/parallel/test-fs-readfile-pipe.js b/test/parallel/test-fs-readfile-pipe.js
index 2ac547e5c7..1078f02e58 100644
--- a/test/parallel/test-fs-readfile-pipe.js
+++ b/test/parallel/test-fs-readfile-pipe.js
@@ -4,7 +4,7 @@ var assert = require('assert');
 
 // simulate `cat readfile.js | node readfile.js`
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.log('1..0 # Skipped: No /dev/stdin on windows.');
   return;
 }
diff --git a/test/parallel/test-fs-readfilesync-pipe-large.js b/test/parallel/test-fs-readfilesync-pipe-large.js
index 9b0b6b4299..ad2e613c0a 100644
--- a/test/parallel/test-fs-readfilesync-pipe-large.js
+++ b/test/parallel/test-fs-readfilesync-pipe-large.js
@@ -5,7 +5,7 @@ var path = require('path');
 
 // simulate `cat readfile.js | node readfile.js`
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.log('1..0 # Skipped: No /dev/stdin on windows.');
   return;
 }
diff --git a/test/parallel/test-fs-realpath.js b/test/parallel/test-fs-realpath.js
index a87ef2428d..9082e1d65f 100644
--- a/test/parallel/test-fs-realpath.js
+++ b/test/parallel/test-fs-realpath.js
@@ -5,13 +5,12 @@ var fs = require('fs');
 var path = require('path');
 var exec = require('child_process').exec;
 var async_completed = 0, async_expected = 0, unlink = [];
-var isWindows = process.platform === 'win32';
 var skipSymlinks = false;
 
 common.refreshTmpDir();
 
 var root = '/';
-if (isWindows) {
+if (common.isWindows) {
   // something like "C:\\"
   root = process.cwd().substr(0, 3);
 
@@ -292,7 +291,7 @@ function test_relative_input_cwd(callback) {
 
 function test_deep_symlink_mix(callback) {
   console.log('test_deep_symlink_mix');
-  if (isWindows) {
+  if (common.isWindows) {
     // This one is a mix of files and directories, and it's quite tricky
     // to get the file/dir links sorted out correctly.
     console.log('1..0 # Skipped: symlink test (no privs)');
@@ -503,7 +502,7 @@ function test_lying_cache_liar(cb) {
                 '/a/b' : '/a/b',
                 '/a/b/c' : '/a/b',
                 '/a/b/d' : '/a/b/d' };
-  if (isWindows) {
+  if (common.isWindows) {
     var wc = {};
     Object.keys(cache).forEach(function(k) {
       wc[ path.resolve(k) ] = path.resolve(cache[k]);
diff --git a/test/parallel/test-fs-symlink.js b/test/parallel/test-fs-symlink.js
index 0315fec549..199add4a1b 100644
--- a/test/parallel/test-fs-symlink.js
+++ b/test/parallel/test-fs-symlink.js
@@ -9,8 +9,6 @@ var expected_async = 4;
 var linkTime;
 var fileTime;
 
-var is_windows = process.platform === 'win32';
-
 common.refreshTmpDir();
 
 var runtest = function(skip_symlinks) {
@@ -57,7 +55,7 @@ var runtest = function(skip_symlinks) {
   });
 };
 
-if (is_windows) {
+if (common.isWindows) {
   // On Windows, creating symlinks requires admin privileges.
   // We'll only try to run symlink test if we have enough privileges.
   exec('whoami /priv', function(err, o) {
diff --git a/test/parallel/test-fs-utimes.js b/test/parallel/test-fs-utimes.js
index 863d66d89e..292636b1b6 100644
--- a/test/parallel/test-fs-utimes.js
+++ b/test/parallel/test-fs-utimes.js
@@ -4,8 +4,6 @@ var assert = require('assert');
 var util = require('util');
 var fs = require('fs');
 
-var is_windows = process.platform === 'win32';
-
 var tests_ok = 0;
 var tests_run = 0;
 
@@ -99,7 +97,7 @@ function runTest(atime, mtime, callback) {
       expect_errno('utimes', 'foobarbaz', err, 'ENOENT');
 
       // don't close this fd
-      if (is_windows) {
+      if (common.isWindows) {
         fd = fs.openSync(__filename, 'r+');
       } else {
         fd = fs.openSync(__filename, 'r');
diff --git a/test/parallel/test-fs-write-file-sync.js b/test/parallel/test-fs-write-file-sync.js
index ea54db1945..37373404da 100644
--- a/test/parallel/test-fs-write-file-sync.js
+++ b/test/parallel/test-fs-write-file-sync.js
@@ -3,7 +3,6 @@ var common = require('../common');
 var assert = require('assert');
 var path = require('path');
 var fs = require('fs');
-var isWindows = process.platform === 'win32';
 var openCount = 0;
 var mode;
 var content;
@@ -20,7 +19,7 @@ var mask = process.umask(0o000);
 
 // On Windows chmod is only able to manipulate read-only bit. Test if creating
 // the file in read-only mode works.
-if (isWindows) {
+if (common.isWindows) {
   mode = 0o444;
 } else {
   mode = 0o755;
diff --git a/test/parallel/test-fs-write-file.js b/test/parallel/test-fs-write-file.js
index eafa7fdabd..6ac7f175f5 100644
--- a/test/parallel/test-fs-write-file.js
+++ b/test/parallel/test-fs-write-file.js
@@ -63,7 +63,7 @@ fs.writeFile(filename3, n, { mode: m }, function(e) {
   if (e) throw e;
 
   // windows permissions aren't unix
-  if (process.platform !== 'win32') {
+  if (!common.isWindows) {
     var st = fs.statSync(filename3);
     assert.equal(st.mode & 0o700, m);
   }
diff --git a/test/parallel/test-https-foafssl.js b/test/parallel/test-https-foafssl.js
index 5b1d04dd41..d6df518989 100644
--- a/test/parallel/test-https-foafssl.js
+++ b/test/parallel/test-https-foafssl.js
@@ -54,7 +54,7 @@ server.listen(common.PORT, function() {
               '-key', join(common.fixturesDir, 'foafssl.key')];
 
   // for the performance and stability issue in s_client on Windows
-  if (process.platform === 'win32')
+  if (common.isWindows)
     args.push('-no_rand_screen');
 
   var client = spawn(common.opensslCli, args);
diff --git a/test/parallel/test-listen-fd-cluster.js b/test/parallel/test-listen-fd-cluster.js
index b10edd33e0..e895a29447 100644
--- a/test/parallel/test-listen-fd-cluster.js
+++ b/test/parallel/test-listen-fd-cluster.js
@@ -9,7 +9,7 @@ var cluster = require('cluster');
 
 console.error('Cluster listen fd test', process.argv.slice(2));
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.log('1..0 # Skipped: This test is disabled on windows.');
   return;
 }
diff --git a/test/parallel/test-listen-fd-detached-inherit.js b/test/parallel/test-listen-fd-detached-inherit.js
index 3660766293..7d4df0c1ae 100644
--- a/test/parallel/test-listen-fd-detached-inherit.js
+++ b/test/parallel/test-listen-fd-detached-inherit.js
@@ -6,7 +6,7 @@ var net = require('net');
 var PORT = common.PORT;
 var spawn = require('child_process').spawn;
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.log('1..0 # Skipped: This test is disabled on windows.');
   return;
 }
diff --git a/test/parallel/test-listen-fd-detached.js b/test/parallel/test-listen-fd-detached.js
index b7af1a6a49..12c8c3ddc4 100644
--- a/test/parallel/test-listen-fd-detached.js
+++ b/test/parallel/test-listen-fd-detached.js
@@ -6,7 +6,7 @@ var net = require('net');
 var PORT = common.PORT;
 var spawn = require('child_process').spawn;
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.log('1..0 # Skipped: This test is disabled on windows.');
   return;
 }
diff --git a/test/parallel/test-listen-fd-server.js b/test/parallel/test-listen-fd-server.js
index 8451a79c9e..d4d11e5a8d 100644
--- a/test/parallel/test-listen-fd-server.js
+++ b/test/parallel/test-listen-fd-server.js
@@ -6,7 +6,7 @@ var net = require('net');
 var PORT = common.PORT;
 var spawn = require('child_process').spawn;
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.log('1..0 # Skipped: This test is disabled on windows.');
   return;
 }
diff --git a/test/parallel/test-module-globalpaths-nodepath.js b/test/parallel/test-module-globalpaths-nodepath.js
index d81f5994f2..3369df0676 100644
--- a/test/parallel/test-module-globalpaths-nodepath.js
+++ b/test/parallel/test-module-globalpaths-nodepath.js
@@ -4,12 +4,10 @@ var assert = require('assert');
 
 var module = require('module');
 
-var isWindows = process.platform === 'win32';
-
 var partA, partB;
 var partC = '';
 
-if (isWindows) {
+if (common.isWindows) {
   partA = 'C:\\Users\\Rocko Artischocko\\AppData\\Roaming\\npm';
   partB = 'C:\\Program Files (x86)\\nodejs\\';
   process.env['NODE_PATH'] = partA + ';' + partB + ';' + partC;
diff --git a/test/parallel/test-module-nodemodulepaths.js b/test/parallel/test-module-nodemodulepaths.js
index a1a70309b5..0c70de9f28 100644
--- a/test/parallel/test-module-nodemodulepaths.js
+++ b/test/parallel/test-module-nodemodulepaths.js
@@ -4,11 +4,9 @@ var assert = require('assert');
 
 var module = require('module');
 
-var isWindows = process.platform === 'win32';
-
 var file, delimiter, paths;
 
-if (isWindows) {
+if (common.isWindows) {
   file = 'C:\\Users\\Rocko Artischocko\\node_stuff\\foo';
   delimiter = '\\';
 } else {
diff --git a/test/parallel/test-net-pipe-connect-errors.js b/test/parallel/test-net-pipe-connect-errors.js
index a831b10712..e2ec1debf1 100644
--- a/test/parallel/test-net-pipe-connect-errors.js
+++ b/test/parallel/test-net-pipe-connect-errors.js
@@ -14,7 +14,7 @@ var accessErrorFired = false;
 
 var emptyTxt;
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   // on Win, common.PIPE will be a named pipe, so we use an existing empty
   // file instead
   emptyTxt = path.join(common.fixturesDir, 'empty.txt');
@@ -58,7 +58,7 @@ noEntSocketClient.on('error', function(err) {
 
 
 // On Windows or when running as root, a chmod has no effect on named pipes
-if (process.platform !== 'win32' && process.getuid() !== 0) {
+if (!common.isWindows && process.getuid() !== 0) {
   // Trying to connect to a socket one has no access to should result in EACCES
   var accessServer = net.createServer(function() {
     assert.ok(false);
@@ -83,7 +83,7 @@ if (process.platform !== 'win32' && process.getuid() !== 0) {
 process.on('exit', function() {
   assert.ok(notSocketErrorFired);
   assert.ok(noEntErrorFired);
-  if (process.platform !== 'win32' && process.getuid() !== 0) {
+  if (!common.isWindows && process.getuid() !== 0) {
     assert.ok(accessErrorFired);
   }
 });
diff --git a/test/parallel/test-path-makelong.js b/test/parallel/test-path-makelong.js
index b9cc116a5e..2de630189c 100644
--- a/test/parallel/test-path-makelong.js
+++ b/test/parallel/test-path-makelong.js
@@ -3,7 +3,7 @@ var assert = require('assert');
 var path = require('path');
 var common = require('../common');
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   var file = path.join(common.fixturesDir, 'a.js');
   var resolvedFile = path.resolve(file);
 
diff --git a/test/parallel/test-path.js b/test/parallel/test-path.js
index b1209d762a..c13b8d4efd 100644
--- a/test/parallel/test-path.js
+++ b/test/parallel/test-path.js
@@ -4,8 +4,6 @@ var assert = require('assert');
 
 var path = require('path');
 
-var isWindows = process.platform === 'win32';
-
 var f = __filename;
 
 assert.equal(path.basename(f), 'test-path.js');
@@ -33,7 +31,7 @@ assert.equal(path.posix.basename('basename.ext\\\\'), 'basename.ext\\\\');
 
 // POSIX filenames may include control characters
 // c.f. http://www.dwheeler.com/essays/fixing-unix-linux-filenames.html
-if (!isWindows) {
+if (!common.isWindows) {
   var controlCharFilename = 'Icon' + String.fromCharCode(13);
   assert.equal(path.basename('/a/b/' + controlCharFilename),
                controlCharFilename);
@@ -42,7 +40,7 @@ if (!isWindows) {
 assert.equal(path.extname(f), '.js');
 
 assert.equal(path.dirname(f).substr(-13),
-             isWindows ? 'test\\parallel' : 'test/parallel');
+             common.isWindows ? 'test\\parallel' : 'test/parallel');
 assert.equal(path.dirname('/a/b/'), '/a');
 assert.equal(path.dirname('/a/b'), '/a');
 assert.equal(path.dirname('/a'), '/');
@@ -194,7 +192,7 @@ var joinTests =
     ];
 
 // Windows-specific join tests
-if (isWindows) {
+if (common.isWindows) {
   joinTests = joinTests.concat(
     [// UNC path expected
      [['//foo/bar'], '//foo/bar/'],
@@ -246,7 +244,7 @@ if (isWindows) {
 // Run the join tests.
 joinTests.forEach(function(test) {
   var actual = path.join.apply(path, test[0]);
-  var expected = isWindows ? test[1].replace(/\//g, '\\') : test[1];
+  var expected = common.isWindows ? test[1].replace(/\//g, '\\') : test[1];
   var message = 'path.join(' + test[0].map(JSON.stringify).join(',') + ')' +
                 '\n  expect=' + JSON.stringify(expected) +
                 '\n  actual=' + JSON.stringify(actual);
@@ -306,7 +304,7 @@ assert.equal(path.posix.normalize('a//b//./c'), 'a/b/c');
 assert.equal(path.posix.normalize('a//b//.'), 'a/b');
 
 // path.resolve tests
-if (isWindows) {
+if (common.isWindows) {
   // windows
   var resolveTests =
       // arguments                                    result
@@ -360,7 +358,7 @@ assert.equal(path.posix.isAbsolute('bar/'), false);
 assert.equal(path.posix.isAbsolute('./baz'), false);
 
 // path.relative tests
-if (isWindows) {
+if (common.isWindows) {
   // windows
   var relativeTests =
       // arguments                     result
@@ -409,7 +407,7 @@ assert.equal(path.win32.delimiter, ';');
 assert.equal(path.posix.delimiter, ':');
 
 
-if (isWindows)
+if (common.isWindows)
   assert.deepEqual(path, path.win32, 'should be win32 path module');
 else
   assert.deepEqual(path, path.posix, 'should be posix path module');
diff --git a/test/parallel/test-process-remove-all-signal-listeners.js b/test/parallel/test-process-remove-all-signal-listeners.js
index 408f6596c4..460f8f0365 100644
--- a/test/parallel/test-process-remove-all-signal-listeners.js
+++ b/test/parallel/test-process-remove-all-signal-listeners.js
@@ -1,12 +1,15 @@
 'use strict';
-if (process.platform === 'win32') {
+
+const assert = require('assert');
+const spawn = require('child_process').spawn;
+const common = require('../common');
+
+if (common.isWindows) {
   // Win32 doesn't have signals, just a kindof emulation, insufficient
   // for this test to apply.
   return;
 }
 
-var assert = require('assert');
-var spawn = require('child_process').spawn;
 var ok;
 
 if (process.argv[2] !== '--do-test') {
diff --git a/test/parallel/test-signal-handler.js b/test/parallel/test-signal-handler.js
index f186287b0c..a6e9adab3f 100644
--- a/test/parallel/test-signal-handler.js
+++ b/test/parallel/test-signal-handler.js
@@ -1,12 +1,13 @@
 'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+
 // SIGUSR1 and SIGHUP are not supported on Windows
-if (process.platform === 'win32') {
+if (common.isWindows) {
   process.exit(0);
 }
 
-var common = require('../common');
-var assert = require('assert');
-
 console.log('process.pid: ' + process.pid);
 
 var first = 0,
diff --git a/test/parallel/test-stdio-closed.js b/test/parallel/test-stdio-closed.js
index afa8de9632..9249ea797b 100644
--- a/test/parallel/test-stdio-closed.js
+++ b/test/parallel/test-stdio-closed.js
@@ -3,7 +3,7 @@ var common = require('../common');
 var assert = require('assert');
 var spawn = require('child_process').spawn;
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.log('1..0 # Skipped: platform not supported.');
   return;
 }
diff --git a/test/parallel/test-tls-alert.js b/test/parallel/test-tls-alert.js
index 2f2e62c564..4eedeaa785 100644
--- a/test/parallel/test-tls-alert.js
+++ b/test/parallel/test-tls-alert.js
@@ -35,7 +35,7 @@ var server = tls.Server({
               '-connect', '127.0.0.1:' + common.PORT];
 
   // for the performance and stability issue in s_client on Windows
-  if (process.platform === 'win32')
+  if (common.isWindows)
     args.push('-no_rand_screen');
 
   var client = spawn(common.opensslCli, args);
diff --git a/test/parallel/test-tls-dhe.js b/test/parallel/test-tls-dhe.js
index f6a2f1649b..ffcf52947f 100644
--- a/test/parallel/test-tls-dhe.js
+++ b/test/parallel/test-tls-dhe.js
@@ -45,7 +45,7 @@ function test(keylen, expectedCipher, cb) {
                 '-cipher', ciphers];
 
     // for the performance and stability issue in s_client on Windows
-    if (process.platform === 'win32')
+    if (common.isWindows)
       args.push('-no_rand_screen');
 
     var client = spawn(common.opensslCli, args);
diff --git a/test/parallel/test-tls-ecdh-disable.js b/test/parallel/test-tls-ecdh-disable.js
index 0dea4cac9f..9bfb5f871a 100644
--- a/test/parallel/test-tls-ecdh-disable.js
+++ b/test/parallel/test-tls-ecdh-disable.js
@@ -34,7 +34,7 @@ server.listen(common.PORT, '127.0.0.1', function() {
             ' -connect 127.0.0.1:' + common.PORT;
 
   // for the performance and stability issue in s_client on Windows
-  if (process.platform === 'win32')
+  if (common.isWindows)
     cmd += ' -no_rand_screen';
 
   exec(cmd, function(err, stdout, stderr) {
diff --git a/test/parallel/test-tls-ecdh.js b/test/parallel/test-tls-ecdh.js
index d728de63ee..ce9af395c5 100644
--- a/test/parallel/test-tls-ecdh.js
+++ b/test/parallel/test-tls-ecdh.js
@@ -37,7 +37,7 @@ server.listen(common.PORT, '127.0.0.1', function() {
             ' -connect 127.0.0.1:' + common.PORT;
 
   // for the performance and stability issue in s_client on Windows
-  if (process.platform === 'win32')
+  if (common.isWindows)
     cmd += ' -no_rand_screen';
 
   exec(cmd, function(err, stdout, stderr) {
diff --git a/test/parallel/test-tls-no-sslv3.js b/test/parallel/test-tls-no-sslv3.js
index e4a4df1481..9777397758 100644
--- a/test/parallel/test-tls-no-sslv3.js
+++ b/test/parallel/test-tls-no-sslv3.js
@@ -31,7 +31,7 @@ server.listen(common.PORT, '127.0.0.1', function() {
               '-connect', address];
 
   // for the performance and stability issue in s_client on Windows
-  if (process.platform === 'win32')
+  if (common.isWindows)
     args.push('-no_rand_screen');
 
   var client = spawn(common.opensslCli, args, { stdio: 'inherit' });
diff --git a/test/parallel/test-tls-securepair-server.js b/test/parallel/test-tls-securepair-server.js
index 56feb54e01..ef182f3b5d 100644
--- a/test/parallel/test-tls-securepair-server.js
+++ b/test/parallel/test-tls-securepair-server.js
@@ -97,7 +97,7 @@ server.listen(common.PORT, function() {
   var args = ['s_client', '-connect', '127.0.0.1:' + common.PORT];
 
   // for the performance and stability issue in s_client on Windows
-  if (process.platform === 'win32')
+  if (common.isWindows)
     args.push('-no_rand_screen');
 
   var client = spawn(common.opensslCli, args);
diff --git a/test/parallel/test-tls-server-verify.js b/test/parallel/test-tls-server-verify.js
index cbdf376c7f..fed77357da 100644
--- a/test/parallel/test-tls-server-verify.js
+++ b/test/parallel/test-tls-server-verify.js
@@ -135,7 +135,7 @@ function runClient(prefix, port, options, cb) {
   var args = ['s_client', '-connect', '127.0.0.1:' + port];
 
   // for the performance issue in s_client on Windows
-  if (process.platform === 'win32')
+  if (common.isWindows)
     args.push('-no_rand_screen');
 
   console.log(prefix + '  connecting with', options.name);
diff --git a/test/parallel/test-tls-session-cache.js b/test/parallel/test-tls-session-cache.js
index d1715d6d7d..ddceb973f5 100644
--- a/test/parallel/test-tls-session-cache.js
+++ b/test/parallel/test-tls-session-cache.js
@@ -82,7 +82,7 @@ function doTest(testOptions, callback) {
   ].concat(testOptions.tickets ? [] : '-no_ticket');
 
   // for the performance and stability issue in s_client on Windows
-  if (process.platform === 'win32')
+  if (common.isWindows)
     args.push('-no_rand_screen');
 
   server.listen(common.PORT, function() {
diff --git a/test/parallel/test-tls-set-ciphers.js b/test/parallel/test-tls-set-ciphers.js
index 7be1db0bc4..a303f6fb27 100644
--- a/test/parallel/test-tls-set-ciphers.js
+++ b/test/parallel/test-tls-set-ciphers.js
@@ -41,7 +41,7 @@ server.listen(common.PORT, '127.0.0.1', function() {
             ' -connect 127.0.0.1:' + common.PORT;
 
   // for the performance and stability issue in s_client on Windows
-  if (process.platform === 'win32')
+  if (common.isWindows)
     cmd += ' -no_rand_screen';
 
   exec(cmd, function(err, stdout, stderr) {
diff --git a/test/parallel/test-umask.js b/test/parallel/test-umask.js
index 94d3a1d06f..62f9d82b33 100644
--- a/test/parallel/test-umask.js
+++ b/test/parallel/test-umask.js
@@ -4,7 +4,7 @@ var assert = require('assert');
 
 // Note in Windows one can only set the "user" bits.
 var mask;
-if (process.platform == 'win32') {
+if (common.isWindows) {
   mask = '0600';
 } else {
   mask = '0664';
diff --git a/test/pummel/test-abort-fatal-error.js b/test/pummel/test-abort-fatal-error.js
index 0d31267a64..20d5c137d5 100644
--- a/test/pummel/test-abort-fatal-error.js
+++ b/test/pummel/test-abort-fatal-error.js
@@ -2,7 +2,7 @@
 var assert = require('assert');
 var common = require('../common');
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.log('1..0 # Skipped: no RLIMIT_NOFILE on Windows');
   return;
 }
diff --git a/test/pummel/test-child-process-spawn-loop.js b/test/pummel/test-child-process-spawn-loop.js
index defed7d5f6..7e686cada2 100644
--- a/test/pummel/test-child-process-spawn-loop.js
+++ b/test/pummel/test-child-process-spawn-loop.js
@@ -4,8 +4,6 @@ var assert = require('assert');
 
 var spawn = require('child_process').spawn;
 
-var is_windows = process.platform === 'win32';
-
 var SIZE = 1000 * 1024;
 var N = 40;
 var finished = false;
@@ -25,7 +23,7 @@ function doSpawn(i) {
 
   child.on('close', function() {
     // + 1 for \n or + 2 for \r\n on Windows
-    assert.equal(SIZE + (is_windows ? 2 : 1), count);
+    assert.equal(SIZE + (common.isWindows ? 2 : 1), count);
     if (i < N) {
       doSpawn(i + 1);
     } else {
diff --git a/test/pummel/test-exec.js b/test/pummel/test-exec.js
index 4013e2107b..0ff1e2a7cf 100644
--- a/test/pummel/test-exec.js
+++ b/test/pummel/test-exec.js
@@ -3,7 +3,7 @@ var common = require('../common');
 var assert = require('assert');
 var exec = require('child_process').exec;
 
-if (process.platform !== 'win32') {
+if (!common.isWindows) {
   // Unix.
   var SLEEP3_COMMAND = 'sleep 3';
 } else {
diff --git a/test/pummel/test-keep-alive.js b/test/pummel/test-keep-alive.js
index 4d3fbe0731..d396042fde 100644
--- a/test/pummel/test-keep-alive.js
+++ b/test/pummel/test-keep-alive.js
@@ -1,5 +1,5 @@
 'use strict';
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.log('1..0 # Skipped: no `wrk` on windows');
   return;
 }
diff --git a/test/sequential/test-child-process-emfile.js b/test/sequential/test-child-process-emfile.js
index ad67411e9e..08a34a05f2 100644
--- a/test/sequential/test-child-process-emfile.js
+++ b/test/sequential/test-child-process-emfile.js
@@ -4,7 +4,7 @@ var assert = require('assert');
 var spawn = require('child_process').spawn;
 var fs = require('fs');
 
-if (process.platform === 'win32') {
+if (common.isWindows) {
   console.log('1..0 # Skipped: no RLIMIT_NOFILE on Windows');
   return;
 }
diff --git a/test/sequential/test-child-process-execsync.js b/test/sequential/test-child-process-execsync.js
index 13982e00a6..07b6ba4c34 100644
--- a/test/sequential/test-child-process-execsync.js
+++ b/test/sequential/test-child-process-execsync.js
@@ -67,7 +67,7 @@ assert.strictEqual(ret, msg + '\n',
   var response;
   var cwd;
 
-  if (process.platform === 'win32') {
+  if (common.isWindows) {
     cwd = 'c:\\';
     response = execSync('echo %cd%', {cwd: cwd});
   } else {
diff --git a/test/sequential/test-fs-watch.js b/test/sequential/test-fs-watch.js
index 70788c5853..10f4baf591 100644
--- a/test/sequential/test-fs-watch.js
+++ b/test/sequential/test-fs-watch.js
@@ -4,7 +4,7 @@ var assert = require('assert');
 var path = require('path');
 var fs = require('fs');
 
-var expectFilePath = process.platform === 'win32' ||
+var expectFilePath = common.isWindows ||
                      process.platform === 'linux' ||
                      process.platform === 'darwin';
 
diff --git a/test/sequential/test-regress-GH-3542.js b/test/sequential/test-regress-GH-3542.js
index 16981da469..dee24c79fb 100644
--- a/test/sequential/test-regress-GH-3542.js
+++ b/test/sequential/test-regress-GH-3542.js
@@ -1,15 +1,15 @@
 'use strict';
-// This test is only relevant on Windows.
-if (process.platform !== 'win32') {
-  return process.exit(0);
-}
-
 var common = require('../common'),
     assert = require('assert'),
     fs = require('fs'),
     path = require('path'),
     succeeded = 0;
 
+// This test is only relevant on Windows.
+if (!common.isWindows) {
+  return process.exit(0);
+}
+
 function test(p) {
   var result = fs.realpathSync(p);
   assert.strictEqual(result, path.resolve(p));