diff -r 000000000000 -r 6474c204b198 b2g/simulator/packages/subprocess/tests/test-subprocess.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/b2g/simulator/packages/subprocess/tests/test-subprocess.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,144 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+const { Cc, Ci } = require("chrome");
+const subprocess = require("subprocess");
+const env = Cc["@mozilla.org/process/environment;1"].getService(Ci.nsIEnvironment);
+
+// For now, only test on windows
+if (env.get('OS') && env.get('OS').match(/Windows/)) {
+
+exports.testWindows = function (test) {
+  test.waitUntilDone();
+  let envTestValue = "OK";
+  let gotStdout = false;
+
+  var p = subprocess.call({
+    // Retrieve windows cmd.exe path from env
+    command:     env.get('ComSpec'),
+    // In order to execute a simple "echo" function
+    arguments:   ['/C', 'echo %ENV_TEST%'], // ' & type CON' should display stdin, but doesn't work
+    // Printing an environnement variable set here by the parent process
+    environment: ['ENV_TEST='+envTestValue],
+
+    stdin: function(stdin) {
+      // Win32 command line is not really made for stdin
+      // So it doesn't seems to work as it's hard to retrieve stdin
+      stdin.write("stdin");
+      stdin.close();
+    },
+    stdout: function(data) {
+      test.assert(!gotStdout,"don't get stdout twice");
+      test.assertEqual(data,envTestValue+"\r\n","stdout contains the environment variable");
+      gotStdout = true;
+    },
+    stderr: function(data) {
+      test.fail("shouldn't get stderr");
+    },
+    done: function() {
+      test.assert(gotStdout, "got stdout before finished");
+      test.done();
+    },
+    mergeStderr: false
+  });
+
+}
+
+exports.testWindowsStderr = function (test) {
+  test.waitUntilDone();
+  let gotStderr = false;
+
+  var p = subprocess.call({
+    command:     env.get('ComSpec'),
+    arguments:   ['/C', 'nonexistent'],
+
+    stdout: function(data) {
+      test.fail("shouldn't get stdout");
+    },
+    stderr: function(data) {
+      test.assert(!gotStderr,"don't get stderr twice");
+      test.assertEqual(
+        data,
+        "'nonexistent' is not recognized as an internal or external command,\r\n" +
+        "operable program or batch file.\r\n",
+        "stderr contains the error message"
+      );
+      gotStderr = true;
+    },
+    done: function() {
+      test.assert(gotStderr, "got stderr before finished");
+      test.done();
+    },
+    mergeStderr: false
+  });
+
+}
+
+}
+
+if (env.get('USER') && env.get('SHELL')) {
+
+exports.testUnix = function (test) {
+  test.waitUntilDone();
+  let envTestValue = "OK";
+  let gotStdout = false;
+
+  var p = subprocess.call({
+    command:     '/bin/sh',
+    // Print stdin and our env variable
+    //arguments:   ['-c', 'echo $@ $ENV_TEST'],
+    environment: ['ENV_TEST='+envTestValue],
+
+    stdin: function(stdin) {
+      stdin.write("echo $ENV_TEST");
+      stdin.close();
+    },
+    stdout: function(data) {
+      test.assert(!gotStdout,"don't get stdout twice");
+      test.assertEqual(data,envTestValue+"\n","stdout contains the environment variable");
+      gotStdout = true;
+    },
+    stderr: function(data) {
+      test.fail("shouldn't get stderr");
+    },
+    done: function() {
+      test.assert(gotStdout, "got stdout before finished");
+      test.done();
+    },
+    mergeStderr: false
+  });
+}
+
+exports.testUnixStderr = function (test) {
+  test.waitUntilDone();
+  let gotStderr = false;
+
+  var p = subprocess.call({
+    // Hope that we don't have to give absolute path on linux ...
+    command:     '/bin/sh',
+    arguments:   ['nonexistent'],
+
+    stdout: function(data) {
+      test.fail("shouldn't get stdout");
+    },
+    stderr: function(data) {
+      test.assert(!gotStderr,"don't get stderr twice");
+      // There is two variant of error message
+      if (data == "/bin/sh: 0: Can't open nonexistent\n")
+        test.pass("stderr containes the expected error message");
+      else
+        test.assertEqual(data, "/bin/sh: nonexistent: No such file or directory\n",
+                         "stderr contains the error message");
+      gotStderr = true;
+    },
+    done: function() {
+      test.assert(gotStderr, "got stderr before finished");
+      test.done();
+    },
+    mergeStderr: false
+  });
+}
+
+}