test-exec: make it work on Windows

test/pummel/test-exec.js

@@ -22,10 +22,23 @@
 var common = require('../common');
 var assert = require('assert');
 var exec = require('child_process').exec;
+
+if (process.platform !== 'win32') {
+  // Unix.
+  var SLEEP3_COMMAND = "sleep 3";
+} else {
+  // Windows: `choice` is a command built into cmd.exe. Use another cmd process
+  // to create a process tree, so we can catch bugs related to it.
+  var SLEEP3_COMMAND = "cmd /c choice /t 3 /c X /d X";
+}
+
+
 var success_count = 0;
 var error_count = 0;
 
-exec('ls /', function(err, stdout, stderr) {
+
+exec(process.execPath + ' -p -e process.versions',
+     function(err, stdout, stderr) {
   if (err) {
     error_count++;
     console.log('error!: ' + err.code);
@@ -39,7 +52,7 @@ exec('ls /', function(err, stdout, stderr) {
 });
 
 
-exec('ls /DOES_NOT_EXIST', function(err, stdout, stderr) {
+exec('thisisnotavalidcommand', function(err, stdout, stderr) {
   if (err) {
     error_count++;
     assert.equal('', stdout);
@@ -59,7 +72,7 @@ exec('ls /DOES_NOT_EXIST', function(err, stdout, stderr) {
 
 
 var sleeperStart = new Date();
-exec('sleep 3', { timeout: 50 }, function(err, stdout, stderr) {
+exec(SLEEP3_COMMAND, { timeout: 50 }, function(err, stdout, stderr) {
   var diff = (new Date()) - sleeperStart;
   console.log('\'sleep 3\' with timeout 50 took %d ms', diff);
   assert.ok(diff < 500);
@@ -72,7 +85,7 @@ exec('sleep 3', { timeout: 50 }, function(err, stdout, stderr) {
 
 
 var startSleep3 = new Date();
-var killMeTwice = exec('sleep 3', {timeout: 1000}, killMeTwiceCallback);
+var killMeTwice = exec(SLEEP3_COMMAND, {timeout: 1000}, killMeTwiceCallback);
 
 process.nextTick(function() {
   console.log('kill pid %d', killMeTwice.pid);
@@ -85,9 +98,8 @@ process.nextTick(function() {
 
 function killMeTwiceCallback(err, stdout, stderr) {
   var diff = (new Date()) - startSleep3;
-  // We should have already killed this process. Assert that
-  // the timeout still works and that we are getting the proper callback
-  // parameters.
+  // We should have already killed this process. Assert that the timeout still
+  // works and that we are getting the proper callback parameters.
   assert.ok(err);
   assert.ok(err.killed);
   assert.equal(err.signal, 'SIGTERM');
@@ -98,13 +110,13 @@ function killMeTwiceCallback(err, stdout, stderr) {
 }
 
 
-
 exec('python -c "print 200000*\'C\'"', {maxBuffer: 1000},
      function(err, stdout, stderr) {
        assert.ok(err);
        assert.ok(/maxBuffer/.test(err.message));
      });
 
+
 process.on('exit', function() {
   assert.equal(1, success_count);
   assert.equal(1, error_count);