Implemented WebStateObserver::DidFinishNavigation(NavigationHandle*).

ios/web/web_state/navigation_handle_impl_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.
+
+#include "ios/web/web_state/navigation_handle_impl.h"
+
+#import "ios/web/public/test/fakes/test_web_state.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/platform_test.h"
+
+namespace web {
+
+// Test fixture for NavigationHandleImplTest testing.
+class PlatformTestNavigationHandleImplTest : public PlatformTest {
+ protected:
+  PlatformTestNavigationHandleImplTest() : url_("https://chromium.test") {}
+
+  TestWebState web_state_;
+  GURL url_;
+};
+
+// Tests CreateNavigationHandle factory method.
+TEST_F(PlatformTestNavigationHandleImplTest, NavigationHandle) {
+  std::unique_ptr<NavigationHandle> handle =
+      NavigationHandleImpl::CreateNavigationHandle(&web_state_, url_);
+  ASSERT_TRUE(handle);
+
+  EXPECT_EQ(&web_state_, handle->GetWebState());
+  EXPECT_EQ(url_, handle->GetUrl());
+  EXPECT_FALSE(handle->IsSamePage());
+  EXPECT_FALSE(handle->IsErrorPage());
+}
+
+// Tests CreateSamePageNavigationHandle factory method.
+TEST_F(PlatformTestNavigationHandleImplTest, SamePageNavigationHandle) {
+  std::unique_ptr<NavigationHandle> handle =
+      NavigationHandleImpl::CreateSamePageNavigationHandle(&web_state_, url_);
+  ASSERT_TRUE(handle);
+
+  EXPECT_EQ(&web_state_, handle->GetWebState());
+  EXPECT_EQ(url_, handle->GetUrl());
+  EXPECT_TRUE(handle->IsSamePage());
+  EXPECT_FALSE(handle->IsErrorPage());
+}
+
+// Tests CreateErrorPageNavigationHandle factory method.
+TEST_F(PlatformTestNavigationHandleImplTest, ErrorPageNavigationHandle) {
+  std::unique_ptr<NavigationHandle> handle =
+      NavigationHandleImpl::CreateErrorPageNavigationHandle(&web_state_, url_);
+  ASSERT_TRUE(handle);
+
+  EXPECT_EQ(&web_state_, handle->GetWebState());
+  EXPECT_EQ(url_, handle->GetUrl());
+  EXPECT_FALSE(handle->IsSamePage());
+  EXPECT_TRUE(handle->IsErrorPage());
+}
+
+}  // namespace web