Implemented WebStateObserver::DidFinishNavigation(NavigationHandle*).

ios/web/web_state/navigation_context_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_context_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 NavigationContextImplTest testing.
+class NavigationContextImplTest : public PlatformTest {
+ protected:
+  NavigationContextImplTest() : url_("https://chromium.test") {}
+
+  TestWebState web_state_;
+  GURL url_;
+};
+
+// Tests CreateNavigationContext factory method.
+TEST_F(NavigationContextImplTest, NavigationContext) {
+  std::unique_ptr<NavigationContext> context =
+      NavigationContextImpl::CreateNavigationContext(&web_state_, url_);
+  ASSERT_TRUE(context);
+
+  EXPECT_EQ(&web_state_, context->GetWebState());
+  EXPECT_EQ(url_, context->GetUrl());
+  EXPECT_FALSE(context->IsSamePage());
+  EXPECT_FALSE(context->IsErrorPage());
+}
+
+// Tests CreateSamePageNavigationContext factory method.
+TEST_F(NavigationContextImplTest, SamePageNavigationContext) {
+  std::unique_ptr<NavigationContext> context =
+      NavigationContextImpl::CreateSamePageNavigationContext(&web_state_, url_);
+  ASSERT_TRUE(context);
+
+  EXPECT_EQ(&web_state_, context->GetWebState());
+  EXPECT_EQ(url_, context->GetUrl());
+  EXPECT_TRUE(context->IsSamePage());
+  EXPECT_FALSE(context->IsErrorPage());
+}
+
+// Tests CreateErrorPageNavigationContext factory method.
+TEST_F(NavigationContextImplTest, ErrorPageNavigationContext) {
+  std::unique_ptr<NavigationContext> context =
+      NavigationContextImpl::CreateErrorPageNavigationContext(&web_state_,
+                                                              url_);
+  ASSERT_TRUE(context);
+
+  EXPECT_EQ(&web_state_, context->GetWebState());
+  EXPECT_EQ(url_, context->GetUrl());
+  EXPECT_FALSE(context->IsSamePage());
+  EXPECT_TRUE(context->IsErrorPage());
+}
+
+}  // namespace web