diff -r 000000000000 -r 6474c204b198 browser/devtools/styleeditor/test/browser_styleeditor_import.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/styleeditor/test/browser_styleeditor_import.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,73 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// http rather than chrome to improve coverage
+const TESTCASE_URI = TEST_BASE_HTTP + "simple.html";
+
+let tempScope = {};
+Components.utils.import("resource://gre/modules/FileUtils.jsm", tempScope);
+let FileUtils = tempScope.FileUtils;
+
+const FILENAME = "styleeditor-import-test.css";
+const SOURCE = "body{background:red;}";
+
+
+let gUI;
+
+function test()
+{
+  waitForExplicitFinish();
+
+  addTabAndCheckOnStyleEditorAdded(panel => gUI = panel.UI, testEditorAdded);
+
+  content.location = TESTCASE_URI;
+}
+
+function testImport()
+{
+  // create file to import first
+  let file = FileUtils.getFile("ProfD", [FILENAME]);
+  let ostream = FileUtils.openSafeFileOutputStream(file);
+  let converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"]
+                    .createInstance(Ci.nsIScriptableUnicodeConverter);
+  converter.charset = "UTF-8";
+  let istream = converter.convertToInputStream(SOURCE);
+  NetUtil.asyncCopy(istream, ostream, function (status) {
+    FileUtils.closeSafeFileOutputStream(ostream);
+
+    // click the import button now that the file to import is ready
+    gUI._mockImportFile = file;
+
+    waitForFocus(function () {
+      let document = gPanelWindow.document
+      let importButton = document.querySelector(".style-editor-importButton");
+      ok(importButton, "import button exists");
+
+      EventUtils.synthesizeMouseAtCenter(importButton, {}, gPanelWindow);
+    }, gPanelWindow);
+  });
+}
+
+let gAddedCount = 0;
+function testEditorAdded(aEditor)
+{
+  if (++gAddedCount == 2) {
+    // test import after the 2 initial stylesheets have been loaded
+    gUI.editors[0].getSourceEditor().then(function() {
+      testImport();
+    });
+  }
+
+  if (!aEditor.savedFile) {
+    return;
+  }
+
+  is(aEditor.savedFile.leafName, FILENAME,
+     "imported stylesheet will be saved directly into the same file");
+  is(aEditor.friendlyName, FILENAME,
+     "imported stylesheet has the same name as the filename");
+
+  gUI = null;
+  finish();
+}