add unit tests for MediaGalleriesDialogGtk

chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/gtk/extensions/media_galleries_dialog_gtk.h"
 
 #include "base/auto_reset.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/media_gallery/media_galleries_preferences.h"
 #include "chrome/browser/ui/gtk/gtk_util.h"
 #include "grit/generated_resources.h"
 #include "ui/base/gtk/gtk_hig_constants.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace chrome {
 
 typedef MediaGalleriesDialogController::KnownGalleryPermissions
     GalleryPermissions;
 
 MediaGalleriesDialogGtk::MediaGalleriesDialogGtk(
     MediaGalleriesDialogController* controller)
       : controller_(controller),
         window_(NULL),
         confirm_(NULL),
         checkbox_container_(NULL),
         ignore_toggles_(false),
         accepted_(false) {
   InitWidgets();
-  window_ = new ConstrainedWindowGtk(controller->tab_contents(), this);
+
+  // May be NULL during tests.
+  if (controller->tab_contents())
+    window_ = new ConstrainedWindowGtk(controller->tab_contents(), this);
 }
 
 MediaGalleriesDialogGtk::~MediaGalleriesDialogGtk() {
 }
 
 void MediaGalleriesDialogGtk::InitWidgets() {
   contents_.Own(gtk_vbox_new(FALSE, ui::kContentAreaSpacing));
 
   GtkWidget* header =
       gtk_util::CreateBoldLabel(UTF16ToUTF8(controller_->GetHeader()));
@@ skipping 77 matching lines @@
 
 GtkWidget* MediaGalleriesDialogGtk::GetFocusWidget() {
   return confirm_;
 }
 
 void MediaGalleriesDialogGtk::DeleteDelegate() {
   controller_->DialogFinished(accepted_);
 }
 
 void MediaGalleriesDialogGtk::OnToggled(GtkWidget* widget) {
-  gtk_widget_set_sensitive(confirm_, TRUE);
+  if (confirm_)
+    gtk_widget_set_sensitive(confirm_, TRUE);
 
   if (ignore_toggles_)
     return;
 
   for (CheckboxMap::iterator iter = checkbox_map_.begin();
        iter != checkbox_map_.end(); ++iter) {
     if (iter->second == widget) {
       controller_->GalleryToggled(
           iter->first, gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget)));
       return;
@@ skipping 19 matching lines @@
 
 // MediaGalleriesDialogController ----------------------------------------------
 
 // static
 MediaGalleriesDialog* MediaGalleriesDialog::Create(
     MediaGalleriesDialogController* controller) {
   return new MediaGalleriesDialogGtk(controller);
 }
 
 }  // namespace chrome