diff -r 000000000000 -r 6474c204b198 js/xpconnect/tests/unit/component-file.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/xpconnect/tests/unit/component-file.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,112 @@
+/* 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/. */
+
+Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
+
+const Ci = Components.interfaces;
+
+function do_check_true(cond, text) {
+  // we don't have the test harness' utilities in this scope, so we need this
+  // little helper. In the failure case, the exception is propagated to the
+  // caller in the main run_test() function, and the test fails.
+  if (!cond)
+    throw "Failed check: " + text;
+}
+
+function FileComponent() {
+  this.wrappedJSObject = this;
+}
+FileComponent.prototype =
+{
+  doTest: function() {
+    // throw if anything goes wrong
+
+    // find the current directory path
+    var file = Components.classes["@mozilla.org/file/directory_service;1"]
+               .getService(Ci.nsIProperties)
+               .get("CurWorkD", Ci.nsIFile);
+    file.append("xpcshell.ini");
+
+    // should be able to construct a file
+    var f1 = File(file.path);
+    // with either constructor syntax
+    var f2 = new File(file.path);
+    // and with nsIFiles
+    var f3 = File(file);
+    var f4 = new File(file);
+
+    // do some tests
+    do_check_true(f1 instanceof Ci.nsIDOMFile, "Should be a DOM File");
+    do_check_true(f2 instanceof Ci.nsIDOMFile, "Should be a DOM File");
+    do_check_true(f3 instanceof Ci.nsIDOMFile, "Should be a DOM File");
+    do_check_true(f4 instanceof Ci.nsIDOMFile, "Should be a DOM File");
+
+    do_check_true(f1.name == "xpcshell.ini", "Should be the right file");
+    do_check_true(f2.name == "xpcshell.ini", "Should be the right file");
+    do_check_true(f3.name == "xpcshell.ini", "Should be the right file");
+    do_check_true(f4.name == "xpcshell.ini", "Should be the right file");
+
+    do_check_true(f1.type == "", "Should be the right type");
+    do_check_true(f2.type == "", "Should be the right type");
+    do_check_true(f3.type == "", "Should be the right type");
+    do_check_true(f4.type == "", "Should be the right type");
+
+    var threw = false;
+    try {
+      // Needs a ctor argument
+      var f7 = File();
+    } catch (e) {
+      threw = true;
+    }
+    do_check_true(threw, "No ctor arguments should throw");
+
+    var threw = false;
+    try {
+      // Needs a valid ctor argument
+      var f7 = File(Date(132131532));
+    } catch (e) {
+      threw = true;
+    }
+    do_check_true(threw, "Passing a random object should fail");
+
+    var threw = false
+    try {
+      // Directories fail
+      var dir = Components.classes["@mozilla.org/file/directory_service;1"]
+                          .getService(Ci.nsIProperties)
+                          .get("CurWorkD", Ci.nsIFile);
+      var f7 = File(dir)
+    } catch (e) {
+      threw = true;
+    }
+    do_check_true(threw, "Can't create a File object for a directory");
+
+    return true;
+  },
+
+  // nsIClassInfo + information for XPCOM registration code in XPCOMUtils.jsm
+  classDescription: "File in components scope code",
+  classID: Components.ID("{da332370-91d4-464f-a730-018e14769cab}"),
+  contractID: "@mozilla.org/tests/component-file;1",
+
+  // nsIClassInfo
+  implementationLanguage: Components.interfaces.nsIProgrammingLanguage.JAVASCRIPT,
+  flags: 0,
+
+  getInterfaces: function getInterfaces(aCount) {
+    var interfaces = [Components.interfaces.nsIClassInfo];
+    aCount.value = interfaces.length;
+    return interfaces;
+  },
+
+  getHelperForLanguage: function getHelperForLanguage(aLanguage) {
+    return null;
+  },
+
+  // nsISupports
+  QueryInterface: XPCOMUtils.generateQI([Components.interfaces.nsIClassInfo])
+};
+
+var gComponentsArray = [FileComponent];
+this.NSGetFactory = XPCOMUtils.generateNSGetFactory(gComponentsArray);