Revert of [ios] Move WebStateList to ios/chrome/browser/web_state_list.

ios/shared/chrome/browser/tabs/web_state_list_unittest.mm

Index: ios/shared/chrome/browser/tabs/web_state_list_unittest.mm
diff --git a/ios/shared/chrome/browser/tabs/web_state_list_unittest.mm b/ios/shared/chrome/browser/tabs/web_state_list_unittest.mm
new file mode 100644
index 0000000000000000000000000000000000000000..a786270f700803b1e8b7da895dec4de410eb4e05
--- /dev/null
+++ b/ios/shared/chrome/browser/tabs/web_state_list_unittest.mm
@@ -0,0 +1,496 @@
+// 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/shared/chrome/browser/tabs/web_state_list.h"
+
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "base/supports_user_data.h"
+#import "ios/shared/chrome/browser/tabs/fake_web_state_list_delegate.h"
+#import "ios/shared/chrome/browser/tabs/web_state_list_observer.h"
+#import "ios/shared/chrome/browser/tabs/web_state_opener.h"
+#import "ios/web/public/test/fakes/test_navigation_manager.h"
+#import "ios/web/public/test/fakes/test_web_state.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/platform_test.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace {
+const char kURL0[] = "https://chromium.org/0";
+const char kURL1[] = "https://chromium.org/1";
+const char kURL2[] = "https://chromium.org/2";
+
+// WebStateList observer that records which events have been called by the
+// WebStateList.
+class WebStateListTestObserver : public WebStateListObserver {
+ public:
+  WebStateListTestObserver() = default;
+
+  // Reset statistics whether events have been called.
+  void ResetStatistics() {
+    web_state_inserted_called_ = false;
+    web_state_moved_called_ = false;
+    web_state_replaced_called_ = false;
+    web_state_detached_called_ = false;
+  }
+
+  // Returns whether WebStateInsertedAt was invoked.
+  bool web_state_inserted_called() const { return web_state_inserted_called_; }
+
+  // Returns whether WebStateMoved was invoked.
+  bool web_state_moved_called() const { return web_state_moved_called_; }
+
+  // Returns whether WebStateReplacedAt was invoked.
+  bool web_state_replaced_called() const { return web_state_replaced_called_; }
+
+  // Returns whether WebStateDetachedAt was invoked.
+  bool web_state_detached_called() const { return web_state_detached_called_; }
+
+  // WebStateListObserver implementation.
+  void WebStateInsertedAt(WebStateList* web_state_list,
+                          web::WebState* web_state,
+                          int index) override {
+    web_state_inserted_called_ = true;
+  }
+
+  void WebStateMoved(WebStateList* web_state_list,
+                     web::WebState* web_state,
+                     int from_index,
+                     int to_index) override {
+    web_state_moved_called_ = true;
+  }
+
+  void WebStateReplacedAt(WebStateList* web_state_list,
+                          web::WebState* old_web_state,
+                          web::WebState* new_web_state,
+                          int index) override {
+    web_state_replaced_called_ = true;
+  }
+
+  void WebStateDetachedAt(WebStateList* web_state_list,
+                          web::WebState* web_state,
+                          int index) override {
+    web_state_detached_called_ = true;
+  }
+
+ private:
+  bool web_state_inserted_called_ = false;
+  bool web_state_moved_called_ = false;
+  bool web_state_replaced_called_ = false;
+  bool web_state_detached_called_ = false;
+
+  DISALLOW_COPY_AND_ASSIGN(WebStateListTestObserver);
+};
+
+// A fake NavigationManager used to test opener-opened relationship in the
+// WebStateList.
+class FakeNavigationManager : public web::TestNavigationManager {
+ public:
+  FakeNavigationManager() = default;
+
+  // web::NavigationManager implementation.
+  int GetLastCommittedItemIndex() const override {
+    return last_committed_item_index;
+  }
+
+  bool CanGoBack() const override { return last_committed_item_index > 0; }
+
+  bool CanGoForward() const override {
+    return last_committed_item_index < INT_MAX;
+  }
+
+  void GoBack() override {
+    DCHECK(CanGoBack());
+    --last_committed_item_index;
+  }
+
+  void GoForward() override {
+    DCHECK(CanGoForward());
+    ++last_committed_item_index;
+  }
+
+  void GoToIndex(int index) override { last_committed_item_index = index; }
+
+  int last_committed_item_index = 0;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeNavigationManager);
+};
+
+}  // namespace
+
+class WebStateListTest : public PlatformTest {
+ public:
+  WebStateListTest() : web_state_list_(&web_state_list_delegate_) {
+    web_state_list_.AddObserver(&observer_);
+  }
+
+  ~WebStateListTest() override { web_state_list_.RemoveObserver(&observer_); }
+
+ protected:
+  FakeWebStateListDelegate web_state_list_delegate_;
+  WebStateList web_state_list_;
+  WebStateListTestObserver observer_;
+
+  std::unique_ptr<web::WebState> CreateWebState(const char* url) {
+    auto test_web_state = base::MakeUnique<web::TestWebState>();
+    test_web_state->SetCurrentURL(GURL(url));
+    test_web_state->SetNavigationManager(
+        base::MakeUnique<FakeNavigationManager>());
+    // TODO(crbug.com/703565): remove std::move() once Xcode 9.0+ is required.
+    return std::move(test_web_state);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WebStateListTest);
+};
+
+TEST_F(WebStateListTest, IsEmpty) {
+  EXPECT_EQ(0, web_state_list_.count());
+  EXPECT_TRUE(web_state_list_.empty());
+
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+
+  EXPECT_TRUE(observer_.web_state_inserted_called());
+  EXPECT_EQ(1, web_state_list_.count());
+  EXPECT_FALSE(web_state_list_.empty());
+}
+
+TEST_F(WebStateListTest, InsertUrlSingle) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+
+  EXPECT_TRUE(observer_.web_state_inserted_called());
+  EXPECT_EQ(1, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+}
+
+TEST_F(WebStateListTest, InsertUrlMultiple) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+  web_state_list_.InsertWebState(0, CreateWebState(kURL1));
+  web_state_list_.InsertWebState(1, CreateWebState(kURL2));
+
+  EXPECT_TRUE(observer_.web_state_inserted_called());
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+}
+
+TEST_F(WebStateListTest, MoveWebStateAtRightByOne) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+  web_state_list_.InsertWebState(1, CreateWebState(kURL1));
+  web_state_list_.InsertWebState(2, CreateWebState(kURL2));
+
+  // Sanity check before closing WebState.
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+
+  observer_.ResetStatistics();
+  web_state_list_.MoveWebStateAt(0, 1);
+
+  EXPECT_TRUE(observer_.web_state_moved_called());
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+}
+
+TEST_F(WebStateListTest, MoveWebStateAtRightByMoreThanOne) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+  web_state_list_.InsertWebState(1, CreateWebState(kURL1));
+  web_state_list_.InsertWebState(2, CreateWebState(kURL2));
+
+  // Sanity check before closing WebState.
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+
+  observer_.ResetStatistics();
+  web_state_list_.MoveWebStateAt(0, 2);
+
+  EXPECT_TRUE(observer_.web_state_moved_called());
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+}
+
+TEST_F(WebStateListTest, MoveWebStateAtLeftByOne) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+  web_state_list_.InsertWebState(1, CreateWebState(kURL1));
+  web_state_list_.InsertWebState(2, CreateWebState(kURL2));
+
+  // Sanity check before closing WebState.
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+
+  observer_.ResetStatistics();
+  web_state_list_.MoveWebStateAt(2, 1);
+
+  EXPECT_TRUE(observer_.web_state_moved_called());
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+}
+
+TEST_F(WebStateListTest, MoveWebStateAtLeftByMoreThanOne) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+  web_state_list_.InsertWebState(1, CreateWebState(kURL1));
+  web_state_list_.InsertWebState(2, CreateWebState(kURL2));
+
+  // Sanity check before closing WebState.
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+
+  observer_.ResetStatistics();
+  web_state_list_.MoveWebStateAt(2, 0);
+
+  EXPECT_TRUE(observer_.web_state_moved_called());
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+}
+
+TEST_F(WebStateListTest, MoveWebStateAtSameIndex) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+  web_state_list_.InsertWebState(1, CreateWebState(kURL1));
+  web_state_list_.InsertWebState(2, CreateWebState(kURL2));
+
+  // Sanity check before closing WebState.
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+
+  observer_.ResetStatistics();
+  web_state_list_.MoveWebStateAt(2, 2);
+
+  EXPECT_FALSE(observer_.web_state_moved_called());
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+}
+
+TEST_F(WebStateListTest, ReplaceWebStateAt) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+  web_state_list_.InsertWebState(1, CreateWebState(kURL1));
+
+  // Sanity check before replacing WebState.
+  EXPECT_EQ(2, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+
+  observer_.ResetStatistics();
+  std::unique_ptr<web::WebState> old_web_state(
+      web_state_list_.ReplaceWebStateAt(1, CreateWebState(kURL2)));
+
+  EXPECT_TRUE(observer_.web_state_replaced_called());
+  EXPECT_EQ(2, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, old_web_state->GetVisibleURL().spec());
+}
+
+TEST_F(WebStateListTest, DetachWebStateAtIndexBegining) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+  web_state_list_.InsertWebState(1, CreateWebState(kURL1));
+  web_state_list_.InsertWebState(2, CreateWebState(kURL2));
+
+  // Sanity check before closing WebState.
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+
+  observer_.ResetStatistics();
+  web_state_list_.DetachWebStateAt(0);
+
+  EXPECT_TRUE(observer_.web_state_detached_called());
+  EXPECT_EQ(2, web_state_list_.count());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+}
+
+TEST_F(WebStateListTest, DetachWebStateAtIndexMiddle) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+  web_state_list_.InsertWebState(1, CreateWebState(kURL1));
+  web_state_list_.InsertWebState(2, CreateWebState(kURL2));
+
+  // Sanity check before closing WebState.
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+
+  observer_.ResetStatistics();
+  web_state_list_.DetachWebStateAt(1);
+
+  EXPECT_TRUE(observer_.web_state_detached_called());
+  EXPECT_EQ(2, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+}
+
+TEST_F(WebStateListTest, DetachWebStateAtIndexLast) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+  web_state_list_.InsertWebState(1, CreateWebState(kURL1));
+  web_state_list_.InsertWebState(2, CreateWebState(kURL2));
+
+  // Sanity check before closing WebState.
+  EXPECT_EQ(3, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL2, web_state_list_.GetWebStateAt(2)->GetVisibleURL().spec());
+
+  observer_.ResetStatistics();
+  web_state_list_.DetachWebStateAt(2);
+
+  EXPECT_TRUE(observer_.web_state_detached_called());
+  EXPECT_EQ(2, web_state_list_.count());
+  EXPECT_EQ(kURL0, web_state_list_.GetWebStateAt(0)->GetVisibleURL().spec());
+  EXPECT_EQ(kURL1, web_state_list_.GetWebStateAt(1)->GetVisibleURL().spec());
+}
+
+TEST_F(WebStateListTest, OpenersEmptyList) {
+  EXPECT_TRUE(web_state_list_.empty());
+
+  EXPECT_EQ(WebStateList::kInvalidIndex,
+            web_state_list_.GetIndexOfNextWebStateOpenedBy(
+                nullptr, WebStateList::kInvalidIndex, false));
+  EXPECT_EQ(WebStateList::kInvalidIndex,
+            web_state_list_.GetIndexOfLastWebStateOpenedBy(
+                nullptr, WebStateList::kInvalidIndex, false));
+
+  EXPECT_EQ(WebStateList::kInvalidIndex,
+            web_state_list_.GetIndexOfNextWebStateOpenedBy(
+                nullptr, WebStateList::kInvalidIndex, true));
+  EXPECT_EQ(WebStateList::kInvalidIndex,
+            web_state_list_.GetIndexOfLastWebStateOpenedBy(
+                nullptr, WebStateList::kInvalidIndex, true));
+}
+
+TEST_F(WebStateListTest, OpenersNothingOpened) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+  web_state_list_.InsertWebState(1, CreateWebState(kURL1));
+  web_state_list_.InsertWebState(2, CreateWebState(kURL2));
+
+  for (int index = 0; index < web_state_list_.count(); ++index) {
+    web::WebState* opener = web_state_list_.GetWebStateAt(index);
+    EXPECT_EQ(
+        WebStateList::kInvalidIndex,
+        web_state_list_.GetIndexOfNextWebStateOpenedBy(opener, index, false));
+    EXPECT_EQ(
+        WebStateList::kInvalidIndex,
+        web_state_list_.GetIndexOfLastWebStateOpenedBy(opener, index, false));
+
+    EXPECT_EQ(
+        WebStateList::kInvalidIndex,
+        web_state_list_.GetIndexOfNextWebStateOpenedBy(opener, index, true));
+    EXPECT_EQ(
+        WebStateList::kInvalidIndex,
+        web_state_list_.GetIndexOfLastWebStateOpenedBy(opener, index, true));
+  }
+}
+
+TEST_F(WebStateListTest, OpenersChildsAfterOpener) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+  web::WebState* opener = web_state_list_.GetWebStateAt(0);
+
+  web_state_list_.InsertWebState(1, CreateWebState(kURL1));
+  web_state_list_.SetOpenerOfWebStateAt(1, WebStateOpener(opener));
+
+  web_state_list_.InsertWebState(2, CreateWebState(kURL2));
+  web_state_list_.SetOpenerOfWebStateAt(2, WebStateOpener(opener));
+
+  const int start_index = web_state_list_.GetIndexOfWebState(opener);
+  EXPECT_EQ(1,
+            web_state_list_.GetIndexOfNextWebStateOpenedBy(opener, start_index,
+                                                           false));
+  EXPECT_EQ(2,
+            web_state_list_.GetIndexOfLastWebStateOpenedBy(opener, start_index,
+                                                           false));
+
+  EXPECT_EQ(1,
+            web_state_list_.GetIndexOfNextWebStateOpenedBy(opener, start_index,
+                                                           true));
+  EXPECT_EQ(2,
+            web_state_list_.GetIndexOfLastWebStateOpenedBy(opener, start_index,
+                                                           true));
+
+  // Simulate a navigation on the opener, results should not change if not
+  // using groups, but should now be kInvalidIndex otherwise.
+  opener->GetNavigationManager()->GoForward();
+
+  EXPECT_EQ(1,
+            web_state_list_.GetIndexOfNextWebStateOpenedBy(opener, start_index,
+                                                           false));
+  EXPECT_EQ(2,
+            web_state_list_.GetIndexOfLastWebStateOpenedBy(opener, start_index,
+                                                           false));
+
+  EXPECT_EQ(WebStateList::kInvalidIndex,
+            web_state_list_.GetIndexOfNextWebStateOpenedBy(opener, start_index,
+                                                           true));
+  EXPECT_EQ(WebStateList::kInvalidIndex,
+            web_state_list_.GetIndexOfLastWebStateOpenedBy(opener, start_index,
+                                                           true));
+
+  // Add a new WebState with the same opener. It should be considered the next
+  // WebState if groups are considered and the last independently on whether
+  // groups are used or not.
+  web_state_list_.InsertWebState(3, CreateWebState(kURL2));
+  web_state_list_.SetOpenerOfWebStateAt(3, WebStateOpener(opener));
+
+  EXPECT_EQ(1,
+            web_state_list_.GetIndexOfNextWebStateOpenedBy(opener, start_index,
+                                                           false));
+  EXPECT_EQ(3,
+            web_state_list_.GetIndexOfLastWebStateOpenedBy(opener, start_index,
+                                                           false));
+
+  EXPECT_EQ(3,
+            web_state_list_.GetIndexOfNextWebStateOpenedBy(opener, start_index,
+                                                           true));
+  EXPECT_EQ(3,
+            web_state_list_.GetIndexOfLastWebStateOpenedBy(opener, start_index,
+                                                           true));
+}
+
+TEST_F(WebStateListTest, OpenersChildsBeforeOpener) {
+  web_state_list_.InsertWebState(0, CreateWebState(kURL0));
+  web::WebState* opener = web_state_list_.GetWebStateAt(0);
+
+  web_state_list_.InsertWebState(0, CreateWebState(kURL1));
+  web_state_list_.SetOpenerOfWebStateAt(0, WebStateOpener(opener));
+
+  web_state_list_.InsertWebState(1, CreateWebState(kURL2));
+  web_state_list_.SetOpenerOfWebStateAt(1, WebStateOpener(opener));
+
+  const int start_index = web_state_list_.GetIndexOfWebState(opener);
+  EXPECT_EQ(WebStateList::kInvalidIndex,
+            web_state_list_.GetIndexOfNextWebStateOpenedBy(opener, start_index,
+                                                           false));
+  EXPECT_EQ(WebStateList::kInvalidIndex,
+            web_state_list_.GetIndexOfLastWebStateOpenedBy(opener, start_index,
+                                                           false));
+
+  EXPECT_EQ(WebStateList::kInvalidIndex,
+            web_state_list_.GetIndexOfNextWebStateOpenedBy(opener, start_index,
+                                                           true));
+  EXPECT_EQ(WebStateList::kInvalidIndex,
+            web_state_list_.GetIndexOfLastWebStateOpenedBy(opener, start_index,
+                                                           true));
+}