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 PlatformTestNavigationContextImplTest : public PlatformTest {

[rohitrao (ping after 24h), 2017/02/24 01:22:48]

Could this fixture go into an anonymous namespace instead?

Why is "PlatformTest" in the fixture name?

[Eugene But (OOO till 7-30), 2017/02/24 01:49:41]

Fixed fixture name, that was a mistake.

As for an anonymous namespace, there was a discussion on Chromium dev with
conclusion to put fixtures to the same namespace as class that being tested.
I agree with that conclusion and trying to follow that recommendation when I'm
writing tests. 

https://groups.google.com/a/chromium.org/forum/#!topicsearchin/chromium-dev/a...

+ protected:
+  PlatformTestNavigationContextImplTest() : url_("https://chromium.test") {}
+
+  TestWebState web_state_;
+  GURL url_;
+};
+
+// Tests CreateNavigationContext factory method.
+TEST_F(PlatformTestNavigationContextImplTest, 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(PlatformTestNavigationContextImplTest, 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(PlatformTestNavigationContextImplTest, 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