Adds NavigationManager util functions to ios/chrome/browser/web/

ios/chrome/browser/web/navigation_manager_util_unittest.mm

+// Copyright 2017 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.
+
+#import "ios/chrome/browser/web/navigation_manager_util.h"
+
+#import "ios/web/public/navigation_item.h"
+#import "ios/web/public/test/fakes/test_navigation_manager.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#import "testing/gtest_mac.h"
+#include "testing/platform_test.h"
+#include "ui/base/page_transition_types.h"
+#include "url/gurl.h"
+
+class NavigationManagerUtilTest : public PlatformTest {
+ protected:
+  web::TestNavigationManager nav_manager_;
+};
+
+// Tests that empty navigation manager returns nullptr.
+TEST_F(NavigationManagerUtilTest, TestLastNonRedirectedItemEmpty) {
+  EXPECT_FALSE(GetLastNonRedirectedItem(&nav_manager_));
+}
+
+// Tests that typed in URL works correctly.
+TEST_F(NavigationManagerUtilTest, TestLastNonRedirectedItemTypedUrl) {
+  nav_manager_.AddItem(GURL("http://foo.com/page0"), ui::PAGE_TRANSITION_TYPED);
+  web::NavigationItem* item = GetLastNonRedirectedItem(&nav_manager_);
+  ASSERT_TRUE(item);
+  EXPECT_TRUE(ui::PageTransitionTypeIncludingQualifiersIs(
+      item->GetTransitionType(), ui::PAGE_TRANSITION_TYPED));
+}
+
+// Tests that link click works correctly.
+TEST_F(NavigationManagerUtilTest, TestLastNonRedirectedItemLinkClicked) {
+  nav_manager_.AddItem(GURL("http://foo.com/page0"), ui::PAGE_TRANSITION_LINK);
+  web::NavigationItem* item = GetLastNonRedirectedItem(&nav_manager_);
+  ASSERT_TRUE(item);
+  EXPECT_TRUE(ui::PageTransitionTypeIncludingQualifiersIs(
+      item->GetTransitionType(), ui::PAGE_TRANSITION_LINK));
+}
+
+// Tests that redirect items are skipped.
+TEST_F(NavigationManagerUtilTest, TestLastNonRedirectedItemLinkMultiRedirects) {
+  nav_manager_.AddItem(GURL("http://foo.com/page0"), ui::PAGE_TRANSITION_LINK);
+  nav_manager_.AddItem(GURL("http://bar.com/redir1"),
+                       ui::PAGE_TRANSITION_CLIENT_REDIRECT);
+  nav_manager_.AddItem(GURL("http://bar.com/redir2"),
+                       ui::PAGE_TRANSITION_CLIENT_REDIRECT);
+  web::NavigationItem* item = GetLastNonRedirectedItem(&nav_manager_);
+  ASSERT_TRUE(item);
+  EXPECT_TRUE(ui::PageTransitionTypeIncludingQualifiersIs(
+      item->GetTransitionType(), ui::PAGE_TRANSITION_LINK));
+}
+
+// Tests that when all items are redirects, the first one is returned.
+TEST_F(NavigationManagerUtilTest, TestLastNonRedirectedItemAllRedirects) {
+  nav_manager_.AddItem(GURL("http://bar.com/redir0"),
+                       ui::PAGE_TRANSITION_SERVER_REDIRECT);
+  nav_manager_.AddItem(GURL("http://bar.com/redir1"),
+                       ui::PAGE_TRANSITION_CLIENT_REDIRECT);
+  nav_manager_.AddItem(GURL("http://bar.com/redir2"),
+                       ui::PAGE_TRANSITION_CLIENT_REDIRECT);
+  web::NavigationItem* item = GetLastNonRedirectedItem(&nav_manager_);
+  ASSERT_TRUE(item);
+  EXPECT_TRUE(ui::PageTransitionTypeIncludingQualifiersIs(
+      item->GetTransitionType(), ui::PAGE_TRANSITION_SERVER_REDIRECT));
+}
+
+// Tests that earlier redirects are not found.
+TEST_F(NavigationManagerUtilTest, TestLastNonRedirectedItemNotEarliest) {
+  nav_manager_.AddItem(GURL("http://foo.com/bookmark"),
+                       ui::PAGE_TRANSITION_AUTO_BOOKMARK);
+  nav_manager_.AddItem(GURL("http://foo.com/page0"), ui::PAGE_TRANSITION_TYPED);
+  nav_manager_.AddItem(GURL("http://bar.com/redir1"),
+                       ui::PAGE_TRANSITION_CLIENT_REDIRECT);
+  nav_manager_.AddItem(GURL("http://bar.com/redir2"),
+                       ui::PAGE_TRANSITION_CLIENT_REDIRECT);
+  web::NavigationItem* item = GetLastNonRedirectedItem(&nav_manager_);
+  ASSERT_TRUE(item);
+  EXPECT_TRUE(ui::PageTransitionTypeIncludingQualifiersIs(
+      item->GetTransitionType(), ui::PAGE_TRANSITION_TYPED));
+}