Moved serialization out of CRWSessionEntry.

ios/web/web_state/page_display_state_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/web/public/web_state/page_display_state.h"
+
+#import "base/mac/scoped_nsobject.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#define EXPECT_NAN(value) EXPECT_NE(value, value)
+
+// Tests that the empty constructor creates an invalid PageDisplayState with all
+// NAN values.
+TEST(PageDisplayStateTest, EmptyConstructor) {
+  web::PageDisplayState state;
+  EXPECT_NAN(state.scroll_state().offset_x());
+  EXPECT_NAN(state.scroll_state().offset_y());
+  EXPECT_NAN(state.zoom_state().minimum_zoom_scale());
+  EXPECT_NAN(state.zoom_state().maximum_zoom_scale());
+  EXPECT_NAN(state.zoom_state().zoom_scale());
+  EXPECT_FALSE(state.IsValid());
+}
+
+// Tests that the constructor with input states correctly populates the display
+// state.
+TEST(PageDisplayStateTest, StatesConstructor) {
+  web::PageScrollState scroll_state(0.0, 1.0);
+  EXPECT_EQ(0.0, scroll_state.offset_x());
+  EXPECT_EQ(1.0, scroll_state.offset_y());
+  EXPECT_TRUE(scroll_state.IsValid());
+  web::PageZoomState zoom_state(1.0, 5.0, 1.0);
+  EXPECT_EQ(1.0, zoom_state.minimum_zoom_scale());
+  EXPECT_EQ(5.0, zoom_state.maximum_zoom_scale());
+  EXPECT_EQ(1.0, zoom_state.zoom_scale());
+  EXPECT_TRUE(zoom_state.IsValid());
+  web::PageDisplayState state(scroll_state, zoom_state);
+  EXPECT_EQ(scroll_state.offset_x(), state.scroll_state().offset_x());
+  EXPECT_EQ(scroll_state.offset_y(), state.scroll_state().offset_y());
+  EXPECT_EQ(zoom_state.minimum_zoom_scale(),
+            state.zoom_state().minimum_zoom_scale());
+  EXPECT_EQ(zoom_state.maximum_zoom_scale(),
+            state.zoom_state().maximum_zoom_scale());
+  EXPECT_EQ(zoom_state.zoom_scale(), state.zoom_state().zoom_scale());
+  EXPECT_TRUE(state.IsValid());
+}
+
+// Tests the constructor with value inputs.
+TEST(PageDisplayStateTest, ValuesConstructor) {
+  web::PageDisplayState state(0.0, 1.0, 1.0, 5.0, 1.0);
+  EXPECT_EQ(0.0, state.scroll_state().offset_x());
+  EXPECT_EQ(1.0, state.scroll_state().offset_y());
+  EXPECT_EQ(1.0, state.zoom_state().minimum_zoom_scale());
+  EXPECT_EQ(5.0, state.zoom_state().maximum_zoom_scale());
+  EXPECT_EQ(1.0, state.zoom_state().zoom_scale());
+  EXPECT_TRUE(state.IsValid());
+}
+
+// Tests converting between a PageDisplayState, its serialization, and back.
+TEST(PageDisplayStateTest, Serialization) {
+  web::PageDisplayState state(0.0, 1.0, 1.0, 5.0, 1.0);
+  base::scoped_nsobject<NSDictionary> serialization(
+      [state.GetSerialization() retain]);
+  web::PageDisplayState new_state(serialization);
+  EXPECT_EQ(state, new_state);
+}