ash/display/display_manager_unittest.cc

// Copyright (c) 2012 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 "ash/display/display_manager.h"

#include "ash/display/display_controller.h"
#include "ash/display/display_layout_store.h"
#include "ash/screen_ash.h"
#include "ash/shell.h"
#include "ash/test/ash_test_base.h"
#include "ash/test/display_manager_test_api.h"
#include "ash/test/mirror_window_test_api.h"
#include "base/format_macros.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "ui/aura/env.h"
#include "ui/aura/root_window.h"
#include "ui/aura/test/event_generator.h"
#include "ui/aura/window_observer.h"
#include "ui/gfx/display_observer.h"
#include "ui/gfx/display.h"

namespace ash {
namespace internal {

using std::vector;
using std::string;

using base::StringPrintf;

namespace {

std::string ToDisplayName(int64 id) {
  return "x-" + base::Int64ToString(id);
}

}  // namespace

class DisplayManagerTest : public test::AshTestBase,
                           public gfx::DisplayObserver,
                           public aura::WindowObserver {
 public:
  DisplayManagerTest()
      : removed_count_(0U),
        root_window_destroyed_(false) {
  }
  virtual ~DisplayManagerTest() {}

  virtual void SetUp() OVERRIDE {
    AshTestBase::SetUp();
    Shell::GetScreen()->AddObserver(this);
    Shell::GetPrimaryRootWindow()->AddObserver(this);
  }
  virtual void TearDown() OVERRIDE {
    Shell::GetPrimaryRootWindow()->RemoveObserver(this);
    Shell::GetScreen()->RemoveObserver(this);
    AshTestBase::TearDown();
  }

  DisplayManager* display_manager() {
    return Shell::GetInstance()->display_manager();
  }
  const vector<gfx::Display>& changed() const { return changed_; }
  const vector<gfx::Display>& added() const { return added_; }

  string GetCountSummary() const {
    return StringPrintf("%" PRIuS " %" PRIuS " %" PRIuS,
                        changed_.size(), added_.size(), removed_count_);
  }

  void reset() {
    changed_.clear();
    added_.clear();
    removed_count_ = 0U;
    root_window_destroyed_ = false;
  }

  bool root_window_destroyed() const {
    return root_window_destroyed_;
  }

  const DisplayInfo& GetDisplayInfo(const gfx::Display& display) {
    return display_manager()->GetDisplayInfo(display.id());
  }

  const DisplayInfo& GetDisplayInfoAt(int index) {
    return GetDisplayInfo(display_manager()->GetDisplayAt(index));
  }

  const gfx::Display& GetDisplayForId(int64 id) {
    return display_manager()->GetDisplayForId(id);
  }

  const DisplayInfo& GetDisplayInfoForId(int64 id) {
    return GetDisplayInfo(display_manager()->GetDisplayForId(id));
  }

  // aura::DisplayObserver overrides:
  virtual void OnDisplayBoundsChanged(const gfx::Display& display) OVERRIDE {
    changed_.push_back(display);
  }
  virtual void OnDisplayAdded(const gfx::Display& new_display) OVERRIDE {
    added_.push_back(new_display);
  }
  virtual void OnDisplayRemoved(const gfx::Display& old_display) OVERRIDE {
    ++removed_count_;
  }

  // aura::WindowObserver overrides:
  virtual void OnWindowDestroying(aura::Window* window) OVERRIDE {
    ASSERT_EQ(Shell::GetPrimaryRootWindow(), window);
    root_window_destroyed_ = true;
  }

 private:
  vector<gfx::Display> changed_;
  vector<gfx::Display> added_;
  size_t removed_count_;
  bool root_window_destroyed_;

  DISALLOW_COPY_AND_ASSIGN(DisplayManagerTest);
};

TEST_F(DisplayManagerTest, UpdateDisplayTest) {
  if (!SupportsMultipleDisplays())
    return;

  EXPECT_EQ(1U, display_manager()->GetNumDisplays());

  // Update primary and add seconary.
  UpdateDisplay("100+0-500x500,0+501-400x400");
  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
  EXPECT_EQ("0,0 500x500",
            display_manager()->GetDisplayAt(0).bounds().ToString());

  EXPECT_EQ("1 1 0", GetCountSummary());
  EXPECT_EQ(display_manager()->GetDisplayAt(0).id(), changed()[0].id());
  EXPECT_EQ(display_manager()->GetDisplayAt(1).id(), added()[0].id());
  EXPECT_EQ("0,0 500x500", changed()[0].bounds().ToString());
  // Secondary display is on right.
  EXPECT_EQ("500,0 400x400", added()[0].bounds().ToString());
  EXPECT_EQ("0,501 400x400",
            GetDisplayInfo(added()[0]).bounds_in_native().ToString());
  reset();

  // Delete secondary.
  UpdateDisplay("100+0-500x500");
  EXPECT_EQ("0 0 1", GetCountSummary());
  reset();

  // Change primary.
  UpdateDisplay("1+1-1000x600");
  EXPECT_EQ("1 0 0", GetCountSummary());
  EXPECT_EQ(display_manager()->GetDisplayAt(0).id(), changed()[0].id());
  EXPECT_EQ("0,0 1000x600", changed()[0].bounds().ToString());
  reset();

  // Add secondary.
  UpdateDisplay("1+1-1000x600,1002+0-600x400");
  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
  EXPECT_EQ("0 1 0", GetCountSummary());
  EXPECT_EQ(display_manager()->GetDisplayAt(1).id(), added()[0].id());
  // Secondary display is on right.
  EXPECT_EQ("1000,0 600x400", added()[0].bounds().ToString());
  EXPECT_EQ("1002,0 600x400",
            GetDisplayInfo(added()[0]).bounds_in_native().ToString());
  reset();

  // Secondary removed, primary changed.
  UpdateDisplay("1+1-800x300");
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_EQ("1 0 1", GetCountSummary());
  EXPECT_EQ(display_manager()->GetDisplayAt(0).id(), changed()[0].id());
  EXPECT_EQ("0,0 800x300", changed()[0].bounds().ToString());
  reset();

  // # of display can go to zero when screen is off.
  const vector<DisplayInfo> empty;
  display_manager()->OnNativeDisplaysChanged(empty);
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_EQ("0 0 0", GetCountSummary());
  EXPECT_FALSE(root_window_destroyed());
  // Display configuration stays the same
  EXPECT_EQ("0,0 800x300",
            display_manager()->GetDisplayAt(0).bounds().ToString());
  reset();

  // Connect to display again
  UpdateDisplay("100+100-500x400");
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_EQ("1 0 0", GetCountSummary());
  EXPECT_FALSE(root_window_destroyed());
  EXPECT_EQ("0,0 500x400", changed()[0].bounds().ToString());
  EXPECT_EQ("100,100 500x400",
            GetDisplayInfo(changed()[0]).bounds_in_native().ToString());
  reset();

  // Go back to zero and wake up with multiple displays.
  display_manager()->OnNativeDisplaysChanged(empty);
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_FALSE(root_window_destroyed());
  reset();

  // Add secondary.
  UpdateDisplay("0+0-1000x600,1000+1000-600x400");
  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
  EXPECT_EQ("0,0 1000x600",
            display_manager()->GetDisplayAt(0).bounds().ToString());
  // Secondary display is on right.
  EXPECT_EQ("1000,0 600x400",
            display_manager()->GetDisplayAt(1).bounds().ToString());
  EXPECT_EQ("1000,1000 600x400",
            GetDisplayInfoAt(1).bounds_in_native().ToString());
  reset();

  // Changing primary will update secondary as well.
  UpdateDisplay("0+0-800x600,1000+1000-600x400");
  EXPECT_EQ("2 0 0", GetCountSummary());
  reset();
  EXPECT_EQ("0,0 800x600",
            display_manager()->GetDisplayAt(0).bounds().ToString());
  EXPECT_EQ("800,0 600x400",
            display_manager()->GetDisplayAt(1).bounds().ToString());
}

// Test in emulation mode (use_fullscreen_host_window=false)
TEST_F(DisplayManagerTest, EmulatorTest) {
  if (!SupportsMultipleDisplays())
    return;

  EXPECT_EQ(1U, display_manager()->GetNumDisplays());

  display_manager()->AddRemoveDisplay();
  // Update primary and add seconary.
  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
  EXPECT_EQ("0 1 0", GetCountSummary());
  reset();

  display_manager()->AddRemoveDisplay();
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_EQ("0 0 1", GetCountSummary());
  reset();

  display_manager()->AddRemoveDisplay();
  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
  EXPECT_EQ("0 1 0", GetCountSummary());
  reset();
}

TEST_F(DisplayManagerTest, OverscanInsetsTest) {
  if (!SupportsMultipleDisplays())
    return;

  UpdateDisplay("0+0-500x500,0+501-400x400");
  reset();
  ASSERT_EQ(2u, display_manager()->GetNumDisplays());
  const DisplayInfo& display_info1 = GetDisplayInfoAt(0);
  const DisplayInfo& display_info2 = GetDisplayInfoAt(1);
  display_manager()->SetOverscanInsets(
      display_info2.id(), gfx::Insets(13, 12, 11, 10));

  std::vector<gfx::Display> changed_displays = changed();
  EXPECT_EQ(1u, changed_displays.size());
  EXPECT_EQ(display_info2.id(), changed_displays[0].id());
  EXPECT_EQ("0,0 500x500",
            GetDisplayInfoAt(0).bounds_in_native().ToString());
  DisplayInfo updated_display_info2 = GetDisplayInfoAt(1);
  EXPECT_EQ("0,501 400x400",
            updated_display_info2.bounds_in_native().ToString());
  EXPECT_EQ("378x376",
            updated_display_info2.size_in_pixel().ToString());
  EXPECT_EQ("13,12,11,10",
            updated_display_info2.overscan_insets_in_dip().ToString());
  EXPECT_EQ("500,0 378x376",
            ScreenAsh::GetSecondaryDisplay().bounds().ToString());

  // Make sure that SetOverscanInsets() is idempotent.
  display_manager()->SetOverscanInsets(display_info1.id(), gfx::Insets());
  display_manager()->SetOverscanInsets(
      display_info2.id(), gfx::Insets(13, 12, 11, 10));
  EXPECT_EQ("0,0 500x500",
            GetDisplayInfoAt(0).bounds_in_native().ToString());
  updated_display_info2 = GetDisplayInfoAt(1);
  EXPECT_EQ("0,501 400x400",
            updated_display_info2.bounds_in_native().ToString());
  EXPECT_EQ("378x376",
            updated_display_info2.size_in_pixel().ToString());
  EXPECT_EQ("13,12,11,10",
            updated_display_info2.overscan_insets_in_dip().ToString());

  display_manager()->SetOverscanInsets(
      display_info2.id(), gfx::Insets(10, 11, 12, 13));
  EXPECT_EQ("0,0 500x500",
            GetDisplayInfoAt(0).bounds_in_native().ToString());
  EXPECT_EQ("376x378",
            GetDisplayInfoAt(1).size_in_pixel().ToString());
  EXPECT_EQ("10,11,12,13",
            GetDisplayInfoAt(1).overscan_insets_in_dip().ToString());

  // Recreate a new 2nd display. It won't apply the overscan inset because the
  // new display has a different ID.
  UpdateDisplay("0+0-500x500");
  UpdateDisplay("0+0-500x500,0+501-400x400");
  EXPECT_EQ("0,0 500x500",
            GetDisplayInfoAt(0).bounds_in_native().ToString());
  EXPECT_EQ("0,501 400x400",
            GetDisplayInfoAt(1).bounds_in_native().ToString());

  // Recreate the displays with the same ID.  It should apply the overscan
  // inset.
  UpdateDisplay("0+0-500x500");
  std::vector<DisplayInfo> display_info_list;
  display_info_list.push_back(display_info1);
  display_info_list.push_back(display_info2);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ("1,1 500x500",
            GetDisplayInfoAt(0).bounds_in_native().ToString());
  updated_display_info2 = GetDisplayInfoAt(1);
  EXPECT_EQ("376x378",
            updated_display_info2.size_in_pixel().ToString());
  EXPECT_EQ("10,11,12,13",
            updated_display_info2.overscan_insets_in_dip().ToString());

  // HiDPI but overscan display. The specified insets size should be doubled.
  UpdateDisplay("0+0-500x500,0+501-400x400*2");
  display_manager()->SetOverscanInsets(
      display_manager()->GetDisplayAt(1).id(), gfx::Insets(4, 5, 6, 7));
  EXPECT_EQ("0,0 500x500",
            GetDisplayInfoAt(0).bounds_in_native().ToString());
  updated_display_info2 = GetDisplayInfoAt(1);
  EXPECT_EQ("0,501 400x400",
            updated_display_info2.bounds_in_native().ToString());
  EXPECT_EQ("376x380",
            updated_display_info2.size_in_pixel().ToString());
  EXPECT_EQ("4,5,6,7",
            updated_display_info2.overscan_insets_in_dip().ToString());
  EXPECT_EQ("8,10,12,14",
            updated_display_info2.GetOverscanInsetsInPixel().ToString());

  // Make sure switching primary display applies the overscan offset only once.
  ash::Shell::GetInstance()->display_controller()->SetPrimaryDisplay(
      ScreenAsh::GetSecondaryDisplay());
  EXPECT_EQ("-500,0 500x500",
            ScreenAsh::GetSecondaryDisplay().bounds().ToString());
  EXPECT_EQ("0,0 500x500",
            GetDisplayInfo(ScreenAsh::GetSecondaryDisplay()).
            bounds_in_native().ToString());
  EXPECT_EQ("0,501 400x400",
            GetDisplayInfo(Shell::GetScreen()->GetPrimaryDisplay()).
            bounds_in_native().ToString());
  EXPECT_EQ("0,0 188x190",
            Shell::GetScreen()->GetPrimaryDisplay().bounds().ToString());
}

TEST_F(DisplayManagerTest, ZeroOverscanInsets) {
  if (!SupportsMultipleDisplays())
    return;

  // Make sure the display change events is emitted for overscan inset changes.
  UpdateDisplay("0+0-500x500,0+501-400x400");
  ASSERT_EQ(2u, display_manager()->GetNumDisplays());
  int64 display2_id = display_manager()->GetDisplayAt(1).id();

  reset();
  display_manager()->SetOverscanInsets(display2_id, gfx::Insets(0, 0, 0, 0));
  EXPECT_EQ(0u, changed().size());

  reset();
  display_manager()->SetOverscanInsets(display2_id, gfx::Insets(1, 0, 0, 0));
  EXPECT_EQ(1u, changed().size());
  EXPECT_EQ(display2_id, changed()[0].id());

  reset();
  display_manager()->SetOverscanInsets(display2_id, gfx::Insets(0, 0, 0, 0));
  EXPECT_EQ(1u, changed().size());
  EXPECT_EQ(display2_id, changed()[0].id());
}

TEST_F(DisplayManagerTest, TestDeviceScaleOnlyChange) {
  if (!SupportsHostWindowResize())
    return;

  UpdateDisplay("1000x600");
  aura::WindowEventDispatcher* dispatcher =
      Shell::GetPrimaryRootWindow()->GetDispatcher();
  EXPECT_EQ(1, dispatcher->compositor()->device_scale_factor());
  EXPECT_EQ("1000x600",
            Shell::GetPrimaryRootWindow()->bounds().size().ToString());
  UpdateDisplay("1000x600*2");
  EXPECT_EQ(2, dispatcher->compositor()->device_scale_factor());
  EXPECT_EQ("500x300",
            Shell::GetPrimaryRootWindow()->bounds().size().ToString());
}

DisplayInfo CreateDisplayInfo(int64 id, const gfx::Rect& bounds) {
  DisplayInfo info(id, ToDisplayName(id), false);
  info.SetBounds(bounds);
  return info;
}

TEST_F(DisplayManagerTest, TestNativeDisplaysChanged) {
  const int64 internal_display_id =
      test::DisplayManagerTestApi(display_manager()).
      SetFirstDisplayAsInternalDisplay();
  const int external_id = 10;
  const int mirror_id = 11;
  const int64 invalid_id = gfx::Display::kInvalidDisplayID;
  const DisplayInfo internal_display_info =
      CreateDisplayInfo(internal_display_id, gfx::Rect(0, 0, 500, 500));
  const DisplayInfo external_display_info =
      CreateDisplayInfo(external_id, gfx::Rect(1, 1, 100, 100));
  const DisplayInfo mirrored_display_info =
      CreateDisplayInfo(mirror_id, gfx::Rect(0, 0, 500, 500));

  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_EQ(1U, display_manager()->num_connected_displays());
  std::string default_bounds =
      display_manager()->GetDisplayAt(0).bounds().ToString();

  std::vector<DisplayInfo> display_info_list;
  // Primary disconnected.
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_EQ(default_bounds,
            display_manager()->GetDisplayAt(0).bounds().ToString());
  EXPECT_EQ(1U, display_manager()->num_connected_displays());
  EXPECT_FALSE(display_manager()->IsMirrored());

  if (!SupportsMultipleDisplays())
    return;

  // External connected while primary was disconnected.
  display_info_list.push_back(external_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());

  EXPECT_EQ(invalid_id, GetDisplayForId(internal_display_id).id());
  EXPECT_EQ("1,1 100x100",
            GetDisplayInfoForId(external_id).bounds_in_native().ToString());
  EXPECT_EQ(1U, display_manager()->num_connected_displays());
  EXPECT_FALSE(display_manager()->IsMirrored());
  EXPECT_EQ(external_id, Shell::GetScreen()->GetPrimaryDisplay().id());

  EXPECT_EQ(internal_display_id, gfx::Display::InternalDisplayId());

  // Primary connected, with different bounds.
  display_info_list.clear();
  display_info_list.push_back(internal_display_info);
  display_info_list.push_back(external_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
  EXPECT_EQ(internal_display_id, Shell::GetScreen()->GetPrimaryDisplay().id());

  // This combinatino is new, so internal display becomes primary.
  EXPECT_EQ("0,0 500x500",
            GetDisplayForId(internal_display_id).bounds().ToString());
  EXPECT_EQ("1,1 100x100",
            GetDisplayInfoForId(10).bounds_in_native().ToString());
  EXPECT_EQ(2U, display_manager()->num_connected_displays());
  EXPECT_FALSE(display_manager()->IsMirrored());
  EXPECT_EQ(ToDisplayName(internal_display_id),
            display_manager()->GetDisplayNameForId(internal_display_id));

  // Emulate suspend.
  display_info_list.clear();
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
  EXPECT_EQ("0,0 500x500",
            GetDisplayForId(internal_display_id).bounds().ToString());
  EXPECT_EQ("1,1 100x100",
            GetDisplayInfoForId(10).bounds_in_native().ToString());
  EXPECT_EQ(2U, display_manager()->num_connected_displays());
  EXPECT_FALSE(display_manager()->IsMirrored());
  EXPECT_EQ(ToDisplayName(internal_display_id),
            display_manager()->GetDisplayNameForId(internal_display_id));

  // External display has disconnected then resumed.
  display_info_list.push_back(internal_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_EQ("0,0 500x500",
            GetDisplayForId(internal_display_id).bounds().ToString());
  EXPECT_EQ(1U, display_manager()->num_connected_displays());
  EXPECT_FALSE(display_manager()->IsMirrored());

  // External display was changed during suspend.
  display_info_list.push_back(external_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
  EXPECT_EQ(2U, display_manager()->num_connected_displays());
  EXPECT_FALSE(display_manager()->IsMirrored());

  // suspend...
  display_info_list.clear();
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
  EXPECT_EQ(2U, display_manager()->num_connected_displays());
  EXPECT_FALSE(display_manager()->IsMirrored());

  // and resume with different external display.
  display_info_list.push_back(internal_display_info);
  display_info_list.push_back(CreateDisplayInfo(12, gfx::Rect(1, 1, 100, 100)));
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
  EXPECT_EQ(2U, display_manager()->num_connected_displays());
  EXPECT_FALSE(display_manager()->IsMirrored());
  EXPECT_FALSE(display_manager()->IsMirrored());

  // mirrored...
  display_info_list.clear();
  display_info_list.push_back(internal_display_info);
  display_info_list.push_back(mirrored_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_EQ("0,0 500x500",
            GetDisplayForId(internal_display_id).bounds().ToString());
  EXPECT_EQ(2U, display_manager()->num_connected_displays());
  EXPECT_EQ(11U, display_manager()->mirrored_display_id());
  EXPECT_TRUE(display_manager()->IsMirrored());

  // Test display name.
  EXPECT_EQ(ToDisplayName(internal_display_id),
            display_manager()->GetDisplayNameForId(internal_display_id));
  EXPECT_EQ("x-10", display_manager()->GetDisplayNameForId(10));
  EXPECT_EQ("x-11", display_manager()->GetDisplayNameForId(11));
  EXPECT_EQ("x-12", display_manager()->GetDisplayNameForId(12));
  // Default name for the id that doesn't exist.
  EXPECT_EQ("Display 100", display_manager()->GetDisplayNameForId(100));

  // and exit mirroring.
  display_info_list.clear();
  display_info_list.push_back(internal_display_info);
  display_info_list.push_back(external_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
  EXPECT_EQ(2U, display_manager()->num_connected_displays());
  EXPECT_FALSE(display_manager()->IsMirrored());
  EXPECT_EQ("0,0 500x500",
            GetDisplayForId(internal_display_id).bounds().ToString());
  EXPECT_EQ("500,0 100x100",
            GetDisplayForId(10).bounds().ToString());

  // Turn off internal
  display_info_list.clear();
  display_info_list.push_back(external_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_EQ(invalid_id, GetDisplayForId(internal_display_id).id());
  EXPECT_EQ("1,1 100x100",
            GetDisplayInfoForId(external_id).bounds_in_native().ToString());
  EXPECT_EQ(1U, display_manager()->num_connected_displays());
  EXPECT_FALSE(display_manager()->IsMirrored());

  // Switched to another display
  display_info_list.clear();
  display_info_list.push_back(internal_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_EQ(
      "0,0 500x500",
      GetDisplayInfoForId(internal_display_id).bounds_in_native().ToString());
  EXPECT_EQ(1U, display_manager()->num_connected_displays());
  EXPECT_FALSE(display_manager()->IsMirrored());
}

#if defined(OS_WIN)
// TODO(scottmg): RootWindow doesn't get resized on Windows
// Ash. http://crbug.com/247916.
#define MAYBE_TestNativeDisplaysChangedNoInternal \
        DISABLED_TestNativeDisplaysChangedNoInternal
#else
#define MAYBE_TestNativeDisplaysChangedNoInternal \
        TestNativeDisplaysChangedNoInternal
#endif

TEST_F(DisplayManagerTest, MAYBE_TestNativeDisplaysChangedNoInternal) {
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());

  // Don't change the display info if all displays are disconnected.
  std::vector<DisplayInfo> display_info_list;
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());

  // Connect another display which will become primary.
  const DisplayInfo external_display_info =
      CreateDisplayInfo(10, gfx::Rect(1, 1, 100, 100));
  display_info_list.push_back(external_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_EQ("1,1 100x100",
            GetDisplayInfoForId(10).bounds_in_native().ToString());
  EXPECT_EQ("100x100", ash::Shell::GetPrimaryRootWindow()->GetDispatcher()->
      GetHostSize().ToString());
}

#if defined(OS_WIN)
// Tests that rely on the actual host size/location does not work on windows.
#define MAYBE_EnsurePointerInDisplays DISABLED_EnsurePointerInDisplays
#define MAYBE_EnsurePointerInDisplays_2ndOnLeft DISABLED_EnsurePointerInDisplays_2ndOnLeft
#else
#define MAYBE_EnsurePointerInDisplays EnsurePointerInDisplays
#define MAYBE_EnsurePointerInDisplays_2ndOnLeft EnsurePointerInDisplays_2ndOnLeft
#endif

TEST_F(DisplayManagerTest, MAYBE_EnsurePointerInDisplays) {
  UpdateDisplay("200x200,300x300");
  Shell::RootWindowList root_windows = Shell::GetAllRootWindows();

  aura::Env* env = aura::Env::GetInstance();

  aura::test::EventGenerator generator(root_windows[0]);

  // Set the initial position.
  generator.MoveMouseToInHost(350, 150);
  EXPECT_EQ("350,150", env->last_mouse_location().ToString());

  // A mouse pointer will stay in the 2nd display.
  UpdateDisplay("300x300,200x200");
  EXPECT_EQ("450,50", env->last_mouse_location().ToString());

  // A mouse pointer will be outside of displays and move to the
  // center of 2nd display.
  UpdateDisplay("300x300,100x100");
  EXPECT_EQ("350,50", env->last_mouse_location().ToString());

  // 2nd display was disconnected, and the cursor is
  // now in the 1st display.
  UpdateDisplay("400x400");
  EXPECT_EQ("50,350", env->last_mouse_location().ToString());

  // 1st display's resolution has changed, and the mouse pointer is
  // now outside. Move the mouse pointer to the center of 1st display.
  UpdateDisplay("300x300");
  EXPECT_EQ("150,150", env->last_mouse_location().ToString());

  // Move the mouse pointer to the bottom of 1st display.
  generator.MoveMouseToInHost(150, 290);
  EXPECT_EQ("150,290", env->last_mouse_location().ToString());

  // The mouse pointer is now on 2nd display.
  UpdateDisplay("300x280,200x200");
  EXPECT_EQ("450,10", env->last_mouse_location().ToString());
}

TEST_F(DisplayManagerTest, MAYBE_EnsurePointerInDisplays_2ndOnLeft) {
  // Set the 2nd display on the left.
  DisplayLayoutStore* layout_store =
      Shell::GetInstance()->display_manager()->layout_store();
  DisplayLayout layout = layout_store->default_display_layout();
  layout.position = DisplayLayout::LEFT;
  layout_store->SetDefaultDisplayLayout(layout);

  UpdateDisplay("200x200,300x300");
  Shell::RootWindowList root_windows = Shell::GetAllRootWindows();

  EXPECT_EQ("-300,0 300x300",
            ScreenAsh::GetSecondaryDisplay().bounds().ToString());

  aura::Env* env = aura::Env::GetInstance();

  // Set the initial position.
  root_windows[0]->MoveCursorTo(gfx::Point(-150, 250));
  EXPECT_EQ("-150,250", env->last_mouse_location().ToString());

  // A mouse pointer will stay in 2nd display.
  UpdateDisplay("300x300,200x300");
  EXPECT_EQ("-50,150", env->last_mouse_location().ToString());

  // A mouse pointer will be outside of displays and move to the
  // center of 2nd display.
  UpdateDisplay("300x300,200x100");
  EXPECT_EQ("-100,50", env->last_mouse_location().ToString());

  // 2nd display was disconnected. Mouse pointer should move to
  // 1st display.
  UpdateDisplay("300x300");
  EXPECT_EQ("150,150", env->last_mouse_location().ToString());
}

TEST_F(DisplayManagerTest, NativeDisplaysChangedAfterPrimaryChange) {
  if (!SupportsMultipleDisplays())
    return;

  const int64 internal_display_id =
      test::DisplayManagerTestApi(display_manager()).
      SetFirstDisplayAsInternalDisplay();
  const DisplayInfo native_display_info =
      CreateDisplayInfo(internal_display_id, gfx::Rect(0, 0, 500, 500));
  const DisplayInfo secondary_display_info =
      CreateDisplayInfo(10, gfx::Rect(1, 1, 100, 100));

  std::vector<DisplayInfo> display_info_list;
  display_info_list.push_back(native_display_info);
  display_info_list.push_back(secondary_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
  EXPECT_EQ("0,0 500x500",
            GetDisplayForId(internal_display_id).bounds().ToString());
  EXPECT_EQ("500,0 100x100", GetDisplayForId(10).bounds().ToString());

  ash::Shell::GetInstance()->display_controller()->SetPrimaryDisplay(
      GetDisplayForId(secondary_display_info.id()));
  EXPECT_EQ("-500,0 500x500",
            GetDisplayForId(internal_display_id).bounds().ToString());
  EXPECT_EQ("0,0 100x100", GetDisplayForId(10).bounds().ToString());

  // OnNativeDisplaysChanged may change the display bounds.  Here makes sure
  // nothing changed if the exactly same displays are specified.
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ("-500,0 500x500",
            GetDisplayForId(internal_display_id).bounds().ToString());
  EXPECT_EQ("0,0 100x100", GetDisplayForId(10).bounds().ToString());
}

TEST_F(DisplayManagerTest, DontRememberBestResolution) {
  int display_id = 1000;
  DisplayInfo native_display_info =
      CreateDisplayInfo(display_id, gfx::Rect(0, 0, 1000, 500));
  std::vector<Resolution> resolutions;
  resolutions.push_back(Resolution(gfx::Size(1000, 500), false));
  resolutions.push_back(Resolution(gfx::Size(800, 300), false));
  resolutions.push_back(Resolution(gfx::Size(400, 500), false));

  native_display_info.set_resolutions(resolutions);

  std::vector<DisplayInfo> display_info_list;
  display_info_list.push_back(native_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);

  gfx::Size selected;
  EXPECT_FALSE(display_manager()->GetSelectedResolutionForDisplayId(
      display_id, &selected));

  // Unsupported resolution.
  display_manager()->SetDisplayResolution(display_id, gfx::Size(800, 4000));
  EXPECT_FALSE(display_manager()->GetSelectedResolutionForDisplayId(
      display_id, &selected));

  // Supported resolution.
  display_manager()->SetDisplayResolution(display_id, gfx::Size(800, 300));
  EXPECT_TRUE(display_manager()->GetSelectedResolutionForDisplayId(
      display_id, &selected));
  EXPECT_EQ("800x300", selected.ToString());

  // Best resolution.
  display_manager()->SetDisplayResolution(display_id, gfx::Size(1000, 500));
  EXPECT_FALSE(display_manager()->GetSelectedResolutionForDisplayId(
      display_id, &selected));
}

TEST_F(DisplayManagerTest, Rotate) {
  if (!SupportsMultipleDisplays())
    return;

  UpdateDisplay("100x200/r,300x400/l");
  EXPECT_EQ("1,1 100x200",
            GetDisplayInfoAt(0).bounds_in_native().ToString());
  EXPECT_EQ("200x100",
            GetDisplayInfoAt(0).size_in_pixel().ToString());

  EXPECT_EQ("1,201 300x400",
            GetDisplayInfoAt(1).bounds_in_native().ToString());
  EXPECT_EQ("400x300",
            GetDisplayInfoAt(1).size_in_pixel().ToString());
  reset();
  UpdateDisplay("100x200/b,300x400");
  EXPECT_EQ("2 0 0", GetCountSummary());
  reset();

  EXPECT_EQ("1,1 100x200",
            GetDisplayInfoAt(0).bounds_in_native().ToString());
  EXPECT_EQ("100x200",
            GetDisplayInfoAt(0).size_in_pixel().ToString());

  EXPECT_EQ("1,201 300x400",
            GetDisplayInfoAt(1).bounds_in_native().ToString());
  EXPECT_EQ("300x400",
            GetDisplayInfoAt(1).size_in_pixel().ToString());

  // Just Rotating display will change the bounds on both display.
  UpdateDisplay("100x200/l,300x400");
  EXPECT_EQ("2 0 0", GetCountSummary());
  reset();

  // Updating tothe same configuration should report no changes.
  UpdateDisplay("100x200/l,300x400");
  EXPECT_EQ("0 0 0", GetCountSummary());
  reset();

  UpdateDisplay("100x200/l,300x400");
  EXPECT_EQ("0 0 0", GetCountSummary());
  reset();

  UpdateDisplay("200x200");
  EXPECT_EQ("1 0 1", GetCountSummary());
  reset();

  UpdateDisplay("200x200/l");
  EXPECT_EQ("1 0 0", GetCountSummary());
}

TEST_F(DisplayManagerTest, UIScale) {
  UpdateDisplay("1280x800");
  int64 display_id = Shell::GetScreen()->GetPrimaryDisplay().id();
  display_manager()->SetDisplayUIScale(display_id, 1.125f);
  EXPECT_EQ(1.0, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.8f);
  EXPECT_EQ(1.0f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.75f);
  EXPECT_EQ(1.0f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.625f);
  EXPECT_EQ(1.0f, GetDisplayInfoAt(0).ui_scale());

  gfx::Display::SetInternalDisplayId(display_id);

  display_manager()->SetDisplayUIScale(display_id, 1.5f);
  EXPECT_EQ(1.0f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 1.25f);
  EXPECT_EQ(1.0f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 1.125f);
  EXPECT_EQ(1.125f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.8f);
  EXPECT_EQ(0.8f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.75f);
  EXPECT_EQ(0.8f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.625f);
  EXPECT_EQ(0.625f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.6f);
  EXPECT_EQ(0.625f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.5f);
  EXPECT_EQ(0.5f, GetDisplayInfoAt(0).ui_scale());

  UpdateDisplay("1366x768");
  display_manager()->SetDisplayUIScale(display_id, 1.5f);
  EXPECT_EQ(1.0f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 1.25f);
  EXPECT_EQ(1.0f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 1.125f);
  EXPECT_EQ(1.125f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.8f);
  EXPECT_EQ(1.125f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.75f);
  EXPECT_EQ(0.75f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.6f);
  EXPECT_EQ(0.6f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.625f);
  EXPECT_EQ(0.6f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.5f);
  EXPECT_EQ(0.5f, GetDisplayInfoAt(0).ui_scale());

  UpdateDisplay("1280x850*2");
  EXPECT_EQ(1.0f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 1.5f);
  EXPECT_EQ(1.5f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 1.25f);
  EXPECT_EQ(1.25f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 1.125f);
  EXPECT_EQ(1.125f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.8f);
  EXPECT_EQ(0.8f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.75f);
  EXPECT_EQ(0.8f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.625f);
  EXPECT_EQ(0.625f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.6f);
  EXPECT_EQ(0.625f, GetDisplayInfoAt(0).ui_scale());
  display_manager()->SetDisplayUIScale(display_id, 0.5f);
  EXPECT_EQ(0.5f, GetDisplayInfoAt(0).ui_scale());
}


#if defined(OS_WIN)
// TODO(scottmg): RootWindow doesn't get resized on Windows
// Ash. http://crbug.com/247916.
#define MAYBE_UpdateMouseCursorAfterRotateZoom DISABLED_UpdateMouseCursorAfterRotateZoom
#else
#define MAYBE_UpdateMouseCursorAfterRotateZoom UpdateMouseCursorAfterRotateZoom
#endif

TEST_F(DisplayManagerTest, MAYBE_UpdateMouseCursorAfterRotateZoom) {
  // Make sure just rotating will not change native location.
  UpdateDisplay("300x200,200x150");
  Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
  aura::Env* env = aura::Env::GetInstance();

  aura::test::EventGenerator generator1(root_windows[0]);
  aura::test::EventGenerator generator2(root_windows[1]);

  // Test on 1st display.
  generator1.MoveMouseToInHost(150, 50);
  EXPECT_EQ("150,50", env->last_mouse_location().ToString());
  UpdateDisplay("300x200/r,200x150");
  EXPECT_EQ("50,149", env->last_mouse_location().ToString());

  // Test on 2nd display.
  generator2.MoveMouseToInHost(50, 100);
  EXPECT_EQ("250,100", env->last_mouse_location().ToString());
  UpdateDisplay("300x200/r,200x150/l");
  EXPECT_EQ("249,50", env->last_mouse_location().ToString());

  // The native location is now outside, so move to the center
  // of closest display.
  UpdateDisplay("300x200/r,100x50/l");
  EXPECT_EQ("225,50", env->last_mouse_location().ToString());

  // Make sure just zooming will not change native location.
  UpdateDisplay("600x400*2,400x300");

  // Test on 1st display.
  generator1.MoveMouseToInHost(200, 300);
  EXPECT_EQ("100,150", env->last_mouse_location().ToString());
  UpdateDisplay("600x400*2@1.5,400x300");
  EXPECT_EQ("150,225", env->last_mouse_location().ToString());

  // Test on 2nd display.
  UpdateDisplay("600x400,400x300*2");
  generator2.MoveMouseToInHost(200, 250);
  EXPECT_EQ("700,125", env->last_mouse_location().ToString());
  UpdateDisplay("600x400,400x300*2@1.5");
  EXPECT_EQ("750,187", env->last_mouse_location().ToString());

  // The native location is now outside, so move to the
  // center of closest display.
  UpdateDisplay("600x400,400x200*2@1.5");
  EXPECT_EQ("750,75", env->last_mouse_location().ToString());
}

class TestDisplayObserver : public gfx::DisplayObserver {
 public:
  TestDisplayObserver() : changed_(false) {}
  virtual ~TestDisplayObserver() {}

  // gfx::DisplayObserver overrides:
  virtual void OnDisplayBoundsChanged(const gfx::Display& display) OVERRIDE {
  }
  virtual void OnDisplayAdded(const gfx::Display& new_display) OVERRIDE {
    // Mirror window should already be delete before restoring
    // the external dispay.
    EXPECT_FALSE(test_api.GetRootWindow());
    changed_ = true;
  }
  virtual void OnDisplayRemoved(const gfx::Display& old_display) OVERRIDE {
    // Mirror window should not be created until the external display
    // is removed.
    EXPECT_FALSE(test_api.GetRootWindow());
    changed_ = true;
  }

  bool changed_and_reset() {
    bool changed = changed_;
    changed_ = false;
    return changed;
  }

 private:
  test::MirrorWindowTestApi test_api;
  bool changed_;

  DISALLOW_COPY_AND_ASSIGN(TestDisplayObserver);
};

TEST_F(DisplayManagerTest, SoftwareMirroring) {
  if (!SupportsMultipleDisplays())
    return;

  UpdateDisplay("300x400,400x500");

  test::MirrorWindowTestApi test_api;
  EXPECT_EQ(NULL, test_api.GetRootWindow());

  TestDisplayObserver display_observer;
  Shell::GetScreen()->AddObserver(&display_observer);

  DisplayManager* display_manager = Shell::GetInstance()->display_manager();
  display_manager->SetSecondDisplayMode(DisplayManager::MIRRORING);
  display_manager->UpdateDisplays();
  EXPECT_TRUE(display_observer.changed_and_reset());
  EXPECT_EQ(1U, display_manager->GetNumDisplays());
  EXPECT_EQ("0,0 300x400",
            Shell::GetScreen()->GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("400x500", test_api.GetRootWindow()->GetHostSize().ToString());
  EXPECT_EQ("300x400", test_api.GetRootWindow()->bounds().size().ToString());
  EXPECT_TRUE(display_manager->IsMirrored());

  display_manager->SetMirrorMode(false);
  EXPECT_TRUE(display_observer.changed_and_reset());
  EXPECT_EQ(NULL, test_api.GetRootWindow());
  EXPECT_EQ(2U, display_manager->GetNumDisplays());
  EXPECT_FALSE(display_manager->IsMirrored());

  // Make sure the mirror window has the pixel size of the
  // source display.
  display_manager->SetMirrorMode(true);
  EXPECT_TRUE(display_observer.changed_and_reset());

  UpdateDisplay("300x400@0.5,400x500");
  EXPECT_FALSE(display_observer.changed_and_reset());
  EXPECT_EQ("300x400", test_api.GetRootWindow()->bounds().size().ToString());

  UpdateDisplay("310x410*2,400x500");
  EXPECT_FALSE(display_observer.changed_and_reset());
  EXPECT_EQ("310x410", test_api.GetRootWindow()->bounds().size().ToString());

  UpdateDisplay("320x420/r,400x500");
  EXPECT_FALSE(display_observer.changed_and_reset());
  EXPECT_EQ("320x420", test_api.GetRootWindow()->bounds().size().ToString());

  UpdateDisplay("330x440/r,400x500");
  EXPECT_FALSE(display_observer.changed_and_reset());
  EXPECT_EQ("330x440", test_api.GetRootWindow()->bounds().size().ToString());

  // Overscan insets are ignored.
  UpdateDisplay("400x600/o,600x800/o");
  EXPECT_FALSE(display_observer.changed_and_reset());
  EXPECT_EQ("400x600", test_api.GetRootWindow()->bounds().size().ToString());

  Shell::GetScreen()->RemoveObserver(&display_observer);
}

TEST_F(DisplayManagerTest, MirroredLayout) {
  if (!SupportsMultipleDisplays())
    return;

  DisplayManager* display_manager = Shell::GetInstance()->display_manager();
  UpdateDisplay("500x500,400x400");
  EXPECT_FALSE(display_manager->GetCurrentDisplayLayout().mirrored);
  EXPECT_EQ(2, Shell::GetScreen()->GetNumDisplays());
  EXPECT_EQ(2U, display_manager->num_connected_displays());

  UpdateDisplay("1+0-500x500,1+0-500x500");
  EXPECT_TRUE(display_manager->GetCurrentDisplayLayout().mirrored);
  EXPECT_EQ(1, Shell::GetScreen()->GetNumDisplays());
  EXPECT_EQ(2U, display_manager->num_connected_displays());

  UpdateDisplay("500x500,500x500");
  EXPECT_FALSE(display_manager->GetCurrentDisplayLayout().mirrored);
  EXPECT_EQ(2, Shell::GetScreen()->GetNumDisplays());
  EXPECT_EQ(2U, display_manager->num_connected_displays());
}

TEST_F(DisplayManagerTest, InvertLayout) {
  EXPECT_EQ("left, 0",
            DisplayLayout(DisplayLayout::RIGHT, 0).Invert().ToString());
  EXPECT_EQ("left, -100",
            DisplayLayout(DisplayLayout::RIGHT, 100).Invert().ToString());
  EXPECT_EQ("left, 50",
            DisplayLayout(DisplayLayout::RIGHT, -50).Invert().ToString());

  EXPECT_EQ("right, 0",
            DisplayLayout(DisplayLayout::LEFT, 0).Invert().ToString());
  EXPECT_EQ("right, -90",
            DisplayLayout(DisplayLayout::LEFT, 90).Invert().ToString());
  EXPECT_EQ("right, 60",
            DisplayLayout(DisplayLayout::LEFT, -60).Invert().ToString());

  EXPECT_EQ("bottom, 0",
            DisplayLayout(DisplayLayout::TOP, 0).Invert().ToString());
  EXPECT_EQ("bottom, -80",
            DisplayLayout(DisplayLayout::TOP, 80).Invert().ToString());
  EXPECT_EQ("bottom, 70",
            DisplayLayout(DisplayLayout::TOP, -70).Invert().ToString());

  EXPECT_EQ("top, 0",
            DisplayLayout(DisplayLayout::BOTTOM, 0).Invert().ToString());
  EXPECT_EQ("top, -70",
            DisplayLayout(DisplayLayout::BOTTOM, 70).Invert().ToString());
  EXPECT_EQ("top, 80",
            DisplayLayout(DisplayLayout::BOTTOM, -80).Invert().ToString());
}

#if defined(OS_WIN)
// TODO(scottmg): RootWindow doesn't get resized on Windows
// Ash. http://crbug.com/247916.
#define MAYBE_UpdateDisplayWithHostOrigin DISABLED_UpdateDisplayWithHostOrigin
#else
#define MAYBE_UpdateDisplayWithHostOrigin UpdateDisplayWithHostOrigin
#endif

TEST_F(DisplayManagerTest, MAYBE_UpdateDisplayWithHostOrigin) {
  UpdateDisplay("100x200,300x400");
  ASSERT_EQ(2, Shell::GetScreen()->GetNumDisplays());
  Shell::RootWindowList root_windows =
      Shell::GetInstance()->GetAllRootWindows();
  ASSERT_EQ(2U, root_windows.size());
  EXPECT_EQ("1,1", root_windows[0]->GetHostOrigin().ToString());
  EXPECT_EQ("100x200", root_windows[0]->GetHostSize().ToString());
  // UpdateDisplay set the origin if it's not set.
  EXPECT_NE("1,1", root_windows[1]->GetHostOrigin().ToString());
  EXPECT_EQ("300x400", root_windows[1]->GetHostSize().ToString());

  UpdateDisplay("100x200,200+300-300x400");
  ASSERT_EQ(2, Shell::GetScreen()->GetNumDisplays());
  EXPECT_EQ("0,0", root_windows[0]->GetHostOrigin().ToString());
  EXPECT_EQ("100x200", root_windows[0]->GetHostSize().ToString());
  EXPECT_EQ("200,300", root_windows[1]->GetHostOrigin().ToString());
  EXPECT_EQ("300x400", root_windows[1]->GetHostSize().ToString());

  UpdateDisplay("400+500-200x300,300x400");
  ASSERT_EQ(2, Shell::GetScreen()->GetNumDisplays());
  EXPECT_EQ("400,500", root_windows[0]->GetHostOrigin().ToString());
  EXPECT_EQ("200x300", root_windows[0]->GetHostSize().ToString());
  EXPECT_EQ("0,0", root_windows[1]->GetHostOrigin().ToString());
  EXPECT_EQ("300x400", root_windows[1]->GetHostSize().ToString());

  UpdateDisplay("100+200-100x200,300+500-200x300");
  ASSERT_EQ(2, Shell::GetScreen()->GetNumDisplays());
  EXPECT_EQ("100,200", root_windows[0]->GetHostOrigin().ToString());
  EXPECT_EQ("100x200", root_windows[0]->GetHostSize().ToString());
  EXPECT_EQ("300,500", root_windows[1]->GetHostOrigin().ToString());
  EXPECT_EQ("200x300", root_windows[1]->GetHostSize().ToString());
}

}  // namespace internal
}  // namespace ash