[ios] TabIdTabHelper

ios/chrome/browser/web/tab_id_tab_helper_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/tab_id_tab_helper.h"
+
+#import "ios/web/public/test/fakes/test_web_state.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#import "testing/gtest_mac.h"
+#include "testing/platform_test.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+// Test fixture for TabIdTabHelper class.
+class TabIdTabHelperTest : public PlatformTest {
+ protected:
+  web::TestWebState first_web_state_;
+  web::TestWebState second_web_state_;
+};
+
+// Tests that a tab ID is returned for a WebState, and tab ID's are different
+// for different WebStates.
+TEST_F(TabIdTabHelperTest, UniqueIdentifiers) {
+  TabIdTabHelper::CreateForWebState(&first_web_state_);
+  TabIdTabHelper::CreateForWebState(&second_web_state_);
+
+  const NSString* first_tab_id =
+      TabIdTabHelper::FromWebState(&first_web_state_)->tab_id();
+  const NSString* second_tab_id =
+      TabIdTabHelper::FromWebState(&second_web_state_)->tab_id();
+
+  EXPECT_GT([first_tab_id length], 0U);
+  EXPECT_GT([second_tab_id length], 0U);
+  EXPECT_NSNE(first_tab_id, second_tab_id);
+}
+
+// Tests that a tab ID is stable across successive calls.
+TEST_F(TabIdTabHelperTest, StableAcrossCalls) {
+  TabIdTabHelper::CreateForWebState(&first_web_state_);
+  TabIdTabHelper* tab_helper = TabIdTabHelper::FromWebState(&first_web_state_);
+
+  const NSString* first_call_id = tab_helper->tab_id();
+  const NSString* second_call_id = tab_helper->tab_id();
+
+  EXPECT_NSEQ(first_call_id, second_call_id);
+}
+
+// Tests serialization of a tab ID.
+TEST_F(TabIdTabHelperTest, Serialization) {
+  TabIdTabHelper::CreateForWebState(&first_web_state_);
+  TabIdTabHelper* first_tab_helper =
+      TabIdTabHelper::FromWebState(&first_web_state_);
+  const NSString* first_call_id = first_tab_helper->tab_id();
+
+  first_tab_helper->RemoveFromWebState(&first_web_state_);
+
+  TabIdTabHelper::CreateForWebState(&first_web_state_);
+  TabIdTabHelper* second_tab_helper =
+      TabIdTabHelper::FromWebState(&first_web_state_);
+  const NSString* second_call_id = second_tab_helper->tab_id();
+
+  EXPECT_NSEQ(first_call_id, second_call_id);
+}