[ios] Removed canGoBack/canGoForward API from CRWSessionController.

ios/web/navigation/navigation_manager_impl_unittest.mm

 // Copyright 2014 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/web/navigation/navigation_manager_impl.h"
 
 #include "base/logging.h"
 #import "base/mac/scoped_nsobject.h"
 #import "ios/web/navigation/crw_session_controller+private_constructors.h"
 #import "ios/web/navigation/navigation_manager_delegate.h"
@@ skipping 75 matching lines @@
                                referrer:Referrer()
                              transition:ui::PAGE_TRANSITION_TYPED
                       rendererInitiated:NO];
   [session_controller() commitPendingEntry];
 
   EXPECT_EQ(-1, navigation_manager()->GetPendingItemIndex());
   [session_controller() setPendingEntryIndex:0];
   EXPECT_EQ(0, navigation_manager()->GetPendingItemIndex());
 }
 
+// Tests that going back or negative offset is not possible without a committed
+// item.
+TEST_F(NavigationManagerTest, CanGoBackWithoutCommitedItem) {
+  EXPECT_FALSE(navigation_manager()->CanGoBack());
+  EXPECT_FALSE(navigation_manager()->CanGoToOffset(-1));
+}
+
+// Tests that going back or negative offset is not possible if there is a
+// transient item, but not committed items.
+TEST_F(NavigationManagerTest, CanGoBackWithTransientItem) {
+  [session_controller() addTransientEntryWithURL:GURL("http://www.url.com")];
+
+  EXPECT_FALSE(navigation_manager()->CanGoBack());
+  EXPECT_FALSE(navigation_manager()->CanGoToOffset(-1));
+}
+
+// Tests that going back or negative offset is possible if there is a transient
+// item and at least one committed item.
+TEST_F(NavigationManagerTest, CanGoBackWithTransientItemAndCommittedItem) {
+  [session_controller() addPendingEntry:GURL("http://www.url.com")
+                               referrer:Referrer()
+                             transition:ui::PAGE_TRANSITION_TYPED
+                      rendererInitiated:NO];
+  [session_controller() commitPendingEntry];
+  [session_controller() addTransientEntryWithURL:GURL("http://www.url.com/0")];
+
+  EXPECT_TRUE(navigation_manager()->CanGoBack());
+  EXPECT_TRUE(navigation_manager()->CanGoToOffset(-1));
+}
+
+// Tests that going back or negative offset is not possible if there is ony one
+// committed item and no transient item.
+TEST_F(NavigationManagerTest, CanGoBackWithSingleCommitedItem) {
+  [session_controller() addPendingEntry:GURL("http://www.url.com")
+                               referrer:Referrer()
+                             transition:ui::PAGE_TRANSITION_TYPED
+                      rendererInitiated:NO];
+  [session_controller() commitPendingEntry];
+
+  EXPECT_FALSE(navigation_manager()->CanGoBack());
+  EXPECT_FALSE(navigation_manager()->CanGoToOffset(-1));
+}
+
+// Tests going back possibility with multiple committed items.
+TEST_F(NavigationManagerTest, CanGoBackWithMultipleCommitedItems) {
+  [session_controller() addPendingEntry:GURL("http://www.url.com")
+                               referrer:Referrer()
+                             transition:ui::PAGE_TRANSITION_TYPED
+                      rendererInitiated:NO];
+  [session_controller() commitPendingEntry];
+  [session_controller() addPendingEntry:GURL("http://www.url.com/0")
+                               referrer:Referrer()
+                             transition:ui::PAGE_TRANSITION_TYPED
+                      rendererInitiated:NO];
+  [session_controller() commitPendingEntry];
+  [session_controller() addPendingEntry:GURL("http://www.url.com/1")
+                               referrer:Referrer()
+                             transition:ui::PAGE_TRANSITION_TYPED
+                      rendererInitiated:NO];
+  [session_controller() commitPendingEntry];
+
+  EXPECT_TRUE(navigation_manager()->CanGoBack());
+  EXPECT_TRUE(navigation_manager()->CanGoToOffset(-1));
+
+  [session_controller() goToEntry:session_controller().entries[1]];
+  EXPECT_TRUE(navigation_manager()->CanGoBack());
+  EXPECT_TRUE(navigation_manager()->CanGoToOffset(-1));
+
+  [session_controller() goToEntry:session_controller().entries[0]];
+  EXPECT_FALSE(navigation_manager()->CanGoBack());
+  EXPECT_FALSE(navigation_manager()->CanGoToOffset(-1));
+
+  [session_controller() goToEntry:session_controller().entries[1]];
+  EXPECT_TRUE(navigation_manager()->CanGoBack());
+  EXPECT_TRUE(navigation_manager()->CanGoToOffset(-1));
+}
+
+// Tests that going forward or positive offset is not possible if there is a
+// pending entry.
+TEST_F(NavigationManagerTest, CanGoForwardWithPendingItem) {
+  [session_controller() addPendingEntry:GURL("http://www.url.com")
+                               referrer:Referrer()
+                             transition:ui::PAGE_TRANSITION_TYPED
+                      rendererInitiated:NO];
+  [session_controller() commitPendingEntry];
+  [session_controller() addPendingEntry:GURL("http://www.url.com/0")
+                               referrer:Referrer()
+                             transition:ui::PAGE_TRANSITION_TYPED
+                      rendererInitiated:NO];
+  [session_controller() commitPendingEntry];
+  [session_controller() goToEntry:session_controller().entries[0]];
+  [session_controller() addPendingEntry:GURL("http://www.url.com/1")
+                               referrer:Referrer()
+                             transition:ui::PAGE_TRANSITION_TYPED
+                      rendererInitiated:NO];
+
+  // Pending entry should not allow going forward.
+  EXPECT_FALSE(navigation_manager()->CanGoForward());
+  EXPECT_FALSE(navigation_manager()->CanGoToOffset(1));
+}
+
+// Tests that going forward or positive offset is not possible without a
+// committed item.
+TEST_F(NavigationManagerTest, CanGoForwardWithoutCommitedItem) {
+  EXPECT_FALSE(navigation_manager()->CanGoForward());
+  EXPECT_FALSE(navigation_manager()->CanGoToOffset(1));
+}
+
+// Tests that going forward or positive offset is not possible if there is ony
+// one committed item and no transient item.
+TEST_F(NavigationManagerTest, CanGoForwardWithSingleCommitedItem) {
+  [session_controller() addPendingEntry:GURL("http://www.url.com")
+                               referrer:Referrer()
+                             transition:ui::PAGE_TRANSITION_TYPED
+                      rendererInitiated:NO];
+  [session_controller() commitPendingEntry];
+
+  EXPECT_FALSE(navigation_manager()->CanGoForward());
+  EXPECT_FALSE(navigation_manager()->CanGoToOffset(1));
+}
+
+// Tests going forward possibility with multiple committed items.
+TEST_F(NavigationManagerTest, CanGoForwardWithMultipleCommitedEntries) {
+  [session_controller() addPendingEntry:GURL("http://www.url.com")
+                               referrer:Referrer()
+                             transition:ui::PAGE_TRANSITION_TYPED
+                      rendererInitiated:NO];
+  [session_controller() commitPendingEntry];
+  [session_controller() addPendingEntry:GURL("http://www.url.com/0")
+                               referrer:Referrer()
+                             transition:ui::PAGE_TRANSITION_TYPED
+                      rendererInitiated:NO];
+  [session_controller() commitPendingEntry];
+  [session_controller() addPendingEntry:GURL("http://www.url.com/1")
+                               referrer:Referrer()
+                             transition:ui::PAGE_TRANSITION_TYPED
+                      rendererInitiated:NO];
+  [session_controller() commitPendingEntry];
+
+  EXPECT_FALSE(navigation_manager()->CanGoForward());
+  EXPECT_FALSE(navigation_manager()->CanGoToOffset(1));
+
+  [session_controller() goToEntry:session_controller().entries[1]];
+  EXPECT_TRUE(navigation_manager()->CanGoForward());
+  EXPECT_TRUE(navigation_manager()->CanGoToOffset(1));
+
+  [session_controller() goToEntry:session_controller().entries[0]];
+  EXPECT_TRUE(navigation_manager()->CanGoForward());
+  EXPECT_TRUE(navigation_manager()->CanGoToOffset(1));
+
+  [session_controller() goToEntry:session_controller().entries[1]];
+  EXPECT_TRUE(navigation_manager()->CanGoForward());
+  EXPECT_TRUE(navigation_manager()->CanGoToOffset(1));
+
+  [session_controller() goToEntry:session_controller().entries[2]];
+  EXPECT_FALSE(navigation_manager()->CanGoForward());
+  EXPECT_FALSE(navigation_manager()->CanGoToOffset(1));
+}
+
 }  // namespace web