Implement print preview tab controller.

chrome/browser/printing/print_preview_tab_controller_unittest.cc

+// Copyright (c) 2010 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/printing/print_preview_tab_controller.h"
+#include "chrome/browser/tab_contents/tab_contents.h"
+#include "chrome/browser/tabs/tab_strip_model.h"
+#include "chrome/browser/ui/browser_list.h"
+#include "chrome/test/browser_with_test_window_test.h"
+#include "chrome/test/testing_profile.h"
+
+typedef BrowserWithTestWindowTest PrintPreviewTabControllerTest;
+
+// Create/Get a preview tab for initiator tab.
+TEST_F(PrintPreviewTabControllerTest, GetOrCreatePreviewTab) {
+  ASSERT_TRUE(browser());
+  BrowserList::SetLastActive(browser());
+  ASSERT_TRUE(BrowserList::GetLastActive());
+
+  // Lets start with one window with one tab.
+  EXPECT_EQ(1u, BrowserList::size());
+  EXPECT_EQ(0, browser()->tab_count());
+  browser()->NewTab();
+  EXPECT_EQ(1, browser()->tab_count());
+
+  // Create a reference to initiator tab contents.
+  TabContents* initiator_tab = browser()->GetSelectedTabContents();
+
+  printing::PrintPreviewTabController* tab_controller =
+      new printing::PrintPreviewTabController();
+  ASSERT_TRUE(tab_controller);
+
+  // Get the preview tab for initiator tab.
+  TabContents* preview_tab = tab_controller->GetOrCreatePreviewTab(
+      initiator_tab, initiator_tab->controller().window_id().id());
+
+  // New print preview tab is created. Current focus is on preview tab.
+  EXPECT_EQ(2, browser()->tab_count());
+  EXPECT_NE(initiator_tab, preview_tab);
+
+  // Activate initiator_tab.
+  initiator_tab->Activate();
+
+  // Get the print preview tab for initiator tab.
+  TabContents* new_preview_tab = tab_controller->GetOrCreatePreviewTab(
+      initiator_tab, initiator_tab->controller().window_id().id());
+
+  // Preview tab already exists. Tab count remains the same.
+  EXPECT_EQ(2, browser()->tab_count());
+
+  // 1:1 relationship between initiator and preview tab.
+  EXPECT_EQ(new_preview_tab, preview_tab);
+}
+
+// To show multiple print preview tabs exist in the same browser for
+// different initiator tabs. If preview tab already exists for an initiator, it
+// gets focused.
+TEST_F(PrintPreviewTabControllerTest, MultiplePreviewTabs) {
+  ASSERT_TRUE(browser());
+  BrowserList::SetLastActive(browser());
+  ASSERT_TRUE(BrowserList::GetLastActive());
+
+  // Lets start with one window and two tabs.
+  EXPECT_EQ(1u, BrowserList::size());
+  EXPECT_EQ(0, browser()->tab_count());
+
+  browser()->NewTab();
+  TabContents* tab_contents_1 = browser()->GetSelectedTabContents();
+  ASSERT_TRUE(tab_contents_1);
+
+  browser()->NewTab();
+  TabContents* tab_contents_2 = browser()->GetSelectedTabContents();
+  ASSERT_TRUE(tab_contents_2);
+  EXPECT_EQ(2, browser()->tab_count());
+
+  printing::PrintPreviewTabController* tab_controller =
+      new printing::PrintPreviewTabController();
+  ASSERT_TRUE(tab_controller);
+
+  // Create preview tab for |tab_contents_1|
+  TabContents* preview_tab_1 = tab_controller->GetOrCreatePreviewTab(
+      tab_contents_1, tab_contents_1->controller().window_id().id());
+
+  EXPECT_NE(tab_contents_1, preview_tab_1);
+  EXPECT_EQ(3, browser()->tab_count());
+
+  // Create preview tab for |tab_contents_2|
+  TabContents* preview_tab_2 = tab_controller->GetOrCreatePreviewTab(
+      tab_contents_2, tab_contents_2->controller().window_id().id());
+
+  EXPECT_NE(tab_contents_2, preview_tab_2);
+  // 2 initiator tab and 2 preview tabs exist in the same browser.
+  EXPECT_EQ(4, browser()->tab_count());
+
+  TabStripModel* model = browser()->tabstrip_model();
+  ASSERT_TRUE(model);
+
+  int preview_tab_1_index = model->GetIndexOfTabContents(preview_tab_1);
+  int preview_tab_2_index = model->GetIndexOfTabContents(preview_tab_2);
+
+  EXPECT_NE(-1, preview_tab_1_index);
+  EXPECT_NE(-1, preview_tab_2_index);
+  // Current tab is |preview_tab_2|.
+  EXPECT_EQ(preview_tab_2_index, browser()->selected_index());
+
+  // Activate |tab_contents_1| tab.
+  tab_contents_1->Activate();
+
+  // When we get the preview tab for |tab_contents_1|,
+  // |preview_tab_1| is activated and focused.
+  tab_controller->GetOrCreatePreviewTab(
+      tab_contents_1, tab_contents_1->controller().window_id().id());
+  EXPECT_EQ(preview_tab_1_index, browser()->selected_index());
+}