Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

3 files changed, 1659 insertions, 0 deletions

diff --git a/layout/base/gtest/TestAccessibleCaretEventHub.cpp b/layout/base/gtest/TestAccessibleCaretEventHub.cpp
new file mode 100644
index 0000000000..6a3c9b61ac
--- /dev/null
+++ b/layout/base/gtest/TestAccessibleCaretEventHub.cpp
@@ -0,0 +1,785 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+#include "gmock/gmock.h"
+
+#include <iostream>
+#include <string>
+
+#include "AccessibleCaretManager.h"
+
+#include "mozilla/AccessibleCaretEventHub.h"
+#include "mozilla/BasicEvents.h"
+#include "mozilla/MouseEvents.h"
+#include "mozilla/TouchEvents.h"
+
+using ::testing::_;
+using ::testing::AtLeast;
+using ::testing::DefaultValue;
+using ::testing::Eq;
+using ::testing::InSequence;
+using ::testing::MockFunction;
+using ::testing::Return;
+
+// -----------------------------------------------------------------------------
+// This file test the state transitions of AccessibleCaretEventHub under
+// various combination of events and callbacks.
+
+namespace mozilla {
+
+class MockAccessibleCaretManager : public AccessibleCaretManager {
+ public:
+  MockAccessibleCaretManager() : AccessibleCaretManager(nullptr) {}
+
+  MOCK_METHOD2(PressCaret,
+               nsresult(const nsPoint& aPoint, EventClassID aEventClass));
+  MOCK_METHOD1(DragCaret, nsresult(const nsPoint& aPoint));
+  MOCK_METHOD0(ReleaseCaret, nsresult());
+  MOCK_METHOD1(TapCaret, nsresult(const nsPoint& aPoint));
+  MOCK_METHOD1(SelectWordOrShortcut, nsresult(const nsPoint& aPoint));
+  MOCK_METHOD0(OnScrollStart, void());
+  MOCK_METHOD0(OnScrollEnd, void());
+  MOCK_METHOD0(OnScrollPositionChanged, void());
+  MOCK_METHOD0(OnBlur, void());
+};
+
+class MockAccessibleCaretEventHub : public AccessibleCaretEventHub {
+ public:
+  using AccessibleCaretEventHub::DragCaretState;
+  using AccessibleCaretEventHub::LongTapState;
+  using AccessibleCaretEventHub::NoActionState;
+  using AccessibleCaretEventHub::PressCaretState;
+  using AccessibleCaretEventHub::PressNoCaretState;
+  using AccessibleCaretEventHub::ScrollState;
+
+  MockAccessibleCaretEventHub() : AccessibleCaretEventHub(nullptr) {
+    mManager = MakeUnique<MockAccessibleCaretManager>();
+    mInitialized = true;
+  }
+
+  nsPoint GetTouchEventPosition(WidgetTouchEvent* aEvent,
+                                int32_t aIdentifier) const override {
+    // Return the device point directly.
+    LayoutDeviceIntPoint touchIntPoint = aEvent->mTouches[0]->mRefPoint;
+    return nsPoint(touchIntPoint.x, touchIntPoint.y);
+  }
+
+  nsPoint GetMouseEventPosition(WidgetMouseEvent* aEvent) const override {
+    // Return the device point directly.
+    LayoutDeviceIntPoint mouseIntPoint = aEvent->AsGUIEvent()->mRefPoint;
+    return nsPoint(mouseIntPoint.x, mouseIntPoint.y);
+  }
+
+  MockAccessibleCaretManager* GetMockAccessibleCaretManager() {
+    return static_cast<MockAccessibleCaretManager*>(mManager.get());
+  }
+};
+
+// Print the name of the state for debugging.
+static ::std::ostream& operator<<(
+    ::std::ostream& aOstream,
+    const MockAccessibleCaretEventHub::State* aState) {
+  return aOstream << aState->Name();
+}
+
+class AccessibleCaretEventHubTester : public ::testing::Test {
+ public:
+  AccessibleCaretEventHubTester() {
+    DefaultValue<nsresult>::Set(NS_OK);
+    EXPECT_EQ(mHub->GetState(), MockAccessibleCaretEventHub::NoActionState());
+
+    // AccessibleCaretEventHub requires the caller to hold a ref to it. We just
+    // add ref here for the sake of convenience.
+    mHub.get()->AddRef();
+  }
+
+  ~AccessibleCaretEventHubTester() override {
+    // Release the ref added in the constructor.
+    mHub.get()->Release();
+  }
+
+  static UniquePtr<WidgetEvent> CreateMouseEvent(EventMessage aMessage,
+                                                 nscoord aX, nscoord aY) {
+    auto event = MakeUnique<WidgetMouseEvent>(true, aMessage, nullptr,
+                                              WidgetMouseEvent::eReal);
+
+    event->mButton = MouseButton::ePrimary;
+    event->mRefPoint = LayoutDeviceIntPoint(aX, aY);
+
+    return std::move(event);
+  }
+
+  static UniquePtr<WidgetEvent> CreateMousePressEvent(nscoord aX, nscoord aY) {
+    return CreateMouseEvent(eMouseDown, aX, aY);
+  }
+
+  static UniquePtr<WidgetEvent> CreateMouseMoveEvent(nscoord aX, nscoord aY) {
+    return CreateMouseEvent(eMouseMove, aX, aY);
+  }
+
+  static UniquePtr<WidgetEvent> CreateMouseReleaseEvent(nscoord aX,
+                                                        nscoord aY) {
+    return CreateMouseEvent(eMouseUp, aX, aY);
+  }
+
+  static UniquePtr<WidgetEvent> CreateLongTapEvent(nscoord aX, nscoord aY) {
+    return CreateMouseEvent(eMouseLongTap, aX, aY);
+  }
+
+  static UniquePtr<WidgetEvent> CreateTouchEvent(EventMessage aMessage,
+                                                 nscoord aX, nscoord aY) {
+    auto event = MakeUnique<WidgetTouchEvent>(true, aMessage, nullptr);
+    int32_t identifier = 0;
+    LayoutDeviceIntPoint point(aX, aY);
+    LayoutDeviceIntPoint radius(19, 19);
+    float rotationAngle = 0;
+    float force = 1;
+
+    RefPtr<dom::Touch> touch(
+        new dom::Touch(identifier, point, radius, rotationAngle, force));
+    event->mTouches.AppendElement(touch);
+
+    return std::move(event);
+  }
+
+  static UniquePtr<WidgetEvent> CreateTouchStartEvent(nscoord aX, nscoord aY) {
+    return CreateTouchEvent(eTouchStart, aX, aY);
+  }
+
+  static UniquePtr<WidgetEvent> CreateTouchMoveEvent(nscoord aX, nscoord aY) {
+    return CreateTouchEvent(eTouchMove, aX, aY);
+  }
+
+  static UniquePtr<WidgetEvent> CreateTouchEndEvent(nscoord aX, nscoord aY) {
+    return CreateTouchEvent(eTouchEnd, aX, aY);
+  }
+
+  static UniquePtr<WidgetEvent> CreateTouchCancelEvent(nscoord aX, nscoord aY) {
+    return CreateTouchEvent(eTouchCancel, aX, aY);
+  }
+
+  static UniquePtr<WidgetEvent> CreateWheelEvent(EventMessage aMessage) {
+    auto event = MakeUnique<WidgetWheelEvent>(true, aMessage, nullptr);
+
+    return std::move(event);
+  }
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void TestAsyncPanZoomScroll();
+
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  void HandleEventAndCheckState(
+      UniquePtr<WidgetEvent> aEvent,
+      MockAccessibleCaretEventHub::State* aExpectedState,
+      nsEventStatus aExpectedEventStatus) {
+    RefPtr<MockAccessibleCaretEventHub> hub(mHub);
+    nsEventStatus rv = hub->HandleEvent(aEvent.get());
+    EXPECT_EQ(hub->GetState(), aExpectedState);
+    EXPECT_EQ(rv, aExpectedEventStatus);
+  }
+
+  void CheckState(MockAccessibleCaretEventHub::State* aExpectedState) {
+    EXPECT_EQ(mHub->GetState(), aExpectedState);
+  }
+
+  template <typename PressEventCreator, typename ReleaseEventCreator>
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void TestPressReleaseOnNoCaret(
+      PressEventCreator aPressEventCreator,
+      ReleaseEventCreator aReleaseEventCreator);
+
+  template <typename PressEventCreator, typename ReleaseEventCreator>
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void TestPressReleaseOnCaret(
+      PressEventCreator aPressEventCreator,
+      ReleaseEventCreator aReleaseEventCreator);
+
+  template <typename PressEventCreator, typename MoveEventCreator,
+            typename ReleaseEventCreator>
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void TestPressMoveReleaseOnNoCaret(
+      PressEventCreator aPressEventCreator, MoveEventCreator aMoveEventCreator,
+      ReleaseEventCreator aReleaseEventCreator);
+
+  template <typename PressEventCreator, typename MoveEventCreator,
+            typename ReleaseEventCreator>
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void TestPressMoveReleaseOnCaret(
+      PressEventCreator aPressEventCreator, MoveEventCreator aMoveEventCreator,
+      ReleaseEventCreator aReleaseEventCreator);
+
+  template <typename PressEventCreator, typename ReleaseEventCreator>
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void TestLongTapWithSelectWordSuccessful(
+      PressEventCreator aPressEventCreator,
+      ReleaseEventCreator aReleaseEventCreator);
+
+  template <typename PressEventCreator, typename ReleaseEventCreator>
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void TestLongTapWithSelectWordFailed(
+      PressEventCreator aPressEventCreator,
+      ReleaseEventCreator aReleaseEventCreator);
+
+  template <typename PressEventCreator, typename MoveEventCreator,
+            typename ReleaseEventCreator>
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY void TestEventDrivenAsyncPanZoomScroll(
+      PressEventCreator aPressEventCreator, MoveEventCreator aMoveEventCreator,
+      ReleaseEventCreator aReleaseEventCreator);
+
+  // Member variables
+  RefPtr<MockAccessibleCaretEventHub> mHub{new MockAccessibleCaretEventHub()};
+
+};  // class AccessibleCaretEventHubTester
+
+TEST_F(AccessibleCaretEventHubTester, TestMousePressReleaseOnNoCaret)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestPressReleaseOnNoCaret(CreateMousePressEvent, CreateMouseReleaseEvent);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestTouchPressReleaseOnNoCaret)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestPressReleaseOnNoCaret(CreateTouchStartEvent, CreateTouchEndEvent);
+}
+
+template <typename PressEventCreator, typename ReleaseEventCreator>
+void AccessibleCaretEventHubTester::TestPressReleaseOnNoCaret(
+    PressEventCreator aPressEventCreator,
+    ReleaseEventCreator aReleaseEventCreator) {
+  EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), PressCaret(_, _))
+      .WillOnce(Return(NS_ERROR_FAILURE));
+
+  EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), ReleaseCaret()).Times(0);
+
+  EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), TapCaret(_)).Times(0);
+
+  HandleEventAndCheckState(aPressEventCreator(0, 0),
+                           MockAccessibleCaretEventHub::PressNoCaretState(),
+                           nsEventStatus_eIgnore);
+
+  HandleEventAndCheckState(aReleaseEventCreator(0, 0),
+                           MockAccessibleCaretEventHub::NoActionState(),
+                           nsEventStatus_eIgnore);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestMousePressReleaseOnCaret)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestPressReleaseOnCaret(CreateMousePressEvent, CreateMouseReleaseEvent);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestTouchPressReleaseOnCaret)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestPressReleaseOnCaret(CreateTouchStartEvent, CreateTouchEndEvent);
+}
+
+template <typename PressEventCreator, typename ReleaseEventCreator>
+void AccessibleCaretEventHubTester::TestPressReleaseOnCaret(
+    PressEventCreator aPressEventCreator,
+    ReleaseEventCreator aReleaseEventCreator) {
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), PressCaret(_, _))
+        .WillOnce(Return(NS_OK));
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), SelectWordOrShortcut(_))
+        .Times(0);
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), ReleaseCaret());
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), TapCaret(_));
+  }
+
+  HandleEventAndCheckState(aPressEventCreator(0, 0),
+                           MockAccessibleCaretEventHub::PressCaretState(),
+                           nsEventStatus_eConsumeNoDefault);
+
+  HandleEventAndCheckState(CreateLongTapEvent(0, 0),
+                           MockAccessibleCaretEventHub::PressCaretState(),
+                           nsEventStatus_eConsumeNoDefault);
+
+  HandleEventAndCheckState(aReleaseEventCreator(0, 0),
+                           MockAccessibleCaretEventHub::NoActionState(),
+                           nsEventStatus_eConsumeNoDefault);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestMousePressMoveReleaseOnNoCaret)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestPressMoveReleaseOnNoCaret(CreateMousePressEvent, CreateMouseMoveEvent,
+                                CreateMouseReleaseEvent);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestTouchPressMoveReleaseOnNoCaret)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestPressMoveReleaseOnNoCaret(CreateTouchStartEvent, CreateTouchMoveEvent,
+                                CreateTouchEndEvent);
+}
+
+template <typename PressEventCreator, typename MoveEventCreator,
+          typename ReleaseEventCreator>
+void AccessibleCaretEventHubTester::TestPressMoveReleaseOnNoCaret(
+    PressEventCreator aPressEventCreator, MoveEventCreator aMoveEventCreator,
+    ReleaseEventCreator aReleaseEventCreator) {
+  nscoord x0 = 0, y0 = 0;
+  nscoord x1 = 100, y1 = 100;
+  nscoord x2 = 300, y2 = 300;
+  nscoord x3 = 400, y3 = 400;
+
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), PressCaret(_, _))
+        .WillOnce(Return(NS_ERROR_FAILURE));
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), DragCaret(_)).Times(0);
+  }
+
+  HandleEventAndCheckState(aPressEventCreator(x0, y0),
+                           MockAccessibleCaretEventHub::PressNoCaretState(),
+                           nsEventStatus_eIgnore);
+
+  // A small move with the distance between (x0, y0) and (x1, y1) below the
+  // tolerance value.
+  HandleEventAndCheckState(aMoveEventCreator(x1, y1),
+                           MockAccessibleCaretEventHub::PressNoCaretState(),
+                           nsEventStatus_eIgnore);
+
+  // A large move to simulate a dragging to select text since the distance
+  // between (x0, y0) and (x2, y2) is above the tolerance value.
+  HandleEventAndCheckState(aMoveEventCreator(x2, y2),
+                           MockAccessibleCaretEventHub::NoActionState(),
+                           nsEventStatus_eIgnore);
+
+  HandleEventAndCheckState(aReleaseEventCreator(x3, y3),
+                           MockAccessibleCaretEventHub::NoActionState(),
+                           nsEventStatus_eIgnore);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestMousePressMoveReleaseOnCaret)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestPressMoveReleaseOnCaret(CreateMousePressEvent, CreateMouseMoveEvent,
+                              CreateMouseReleaseEvent);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestTouchPressMoveReleaseOnCaret)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestPressMoveReleaseOnCaret(CreateTouchStartEvent, CreateTouchMoveEvent,
+                              CreateTouchEndEvent);
+}
+
+template <typename PressEventCreator, typename MoveEventCreator,
+          typename ReleaseEventCreator>
+void AccessibleCaretEventHubTester::TestPressMoveReleaseOnCaret(
+    PressEventCreator aPressEventCreator, MoveEventCreator aMoveEventCreator,
+    ReleaseEventCreator aReleaseEventCreator) {
+  nscoord x0 = 0, y0 = 0;
+  nscoord x1 = 100, y1 = 100;
+  nscoord x2 = 300, y2 = 300;
+  nscoord x3 = 400, y3 = 400;
+
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), PressCaret(_, _))
+        .WillOnce(Return(NS_OK));
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), DragCaret(_))
+        .Times(2)  // two valid drag operations
+        .WillRepeatedly(Return(NS_OK));
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), ReleaseCaret())
+        .WillOnce(Return(NS_OK));
+  }
+
+  HandleEventAndCheckState(aPressEventCreator(x0, y0),
+                           MockAccessibleCaretEventHub::PressCaretState(),
+                           nsEventStatus_eConsumeNoDefault);
+
+  // A small move with the distance between (x0, y0) and (x1, y1) below the
+  // tolerance value.
+  HandleEventAndCheckState(aMoveEventCreator(x1, y1),
+                           MockAccessibleCaretEventHub::PressCaretState(),
+                           nsEventStatus_eConsumeNoDefault);
+
+  // A large move forms a valid drag since the distance between (x0, y0) and
+  // (x2, y2) is above the tolerance value.
+  HandleEventAndCheckState(aMoveEventCreator(x2, y2),
+                           MockAccessibleCaretEventHub::DragCaretState(),
+                           nsEventStatus_eConsumeNoDefault);
+
+  // Also a valid drag since the distance between (x0, y0) and (x3, y3) above
+  // the tolerance value even if the distance between (x2, y2) and (x3, y3) is
+  // below the tolerance value.
+  HandleEventAndCheckState(aMoveEventCreator(x3, y3),
+                           MockAccessibleCaretEventHub::DragCaretState(),
+                           nsEventStatus_eConsumeNoDefault);
+
+  HandleEventAndCheckState(aReleaseEventCreator(x3, y3),
+                           MockAccessibleCaretEventHub::NoActionState(),
+                           nsEventStatus_eConsumeNoDefault);
+}
+
+TEST_F(AccessibleCaretEventHubTester,
+       TestTouchStartMoveEndOnCaretWithTouchCancelIgnored)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  nscoord x0 = 0, y0 = 0;
+  nscoord x1 = 100, y1 = 100;
+  nscoord x2 = 300, y2 = 300;
+  nscoord x3 = 400, y3 = 400;
+
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), PressCaret(_, _))
+        .WillOnce(Return(NS_OK));
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), DragCaret(_))
+        .WillOnce(Return(NS_OK));
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), ReleaseCaret())
+        .WillOnce(Return(NS_OK));
+  }
+
+  // All the eTouchCancel events should be ignored in this test.
+
+  HandleEventAndCheckState(CreateTouchStartEvent(x0, y0),
+                           MockAccessibleCaretEventHub::PressCaretState(),
+                           nsEventStatus_eConsumeNoDefault);
+
+  HandleEventAndCheckState(CreateTouchCancelEvent(x0, y0),
+                           MockAccessibleCaretEventHub::PressCaretState(),
+                           nsEventStatus_eIgnore);
+
+  // A small move with the distance between (x0, y0) and (x1, y1) below the
+  // tolerance value.
+  HandleEventAndCheckState(CreateTouchMoveEvent(x1, y1),
+                           MockAccessibleCaretEventHub::PressCaretState(),
+                           nsEventStatus_eConsumeNoDefault);
+
+  HandleEventAndCheckState(CreateTouchCancelEvent(x1, y1),
+                           MockAccessibleCaretEventHub::PressCaretState(),
+                           nsEventStatus_eIgnore);
+
+  // A large move forms a valid drag since the distance between (x0, y0) and
+  // (x2, y2) is above the tolerance value.
+  HandleEventAndCheckState(CreateTouchMoveEvent(x2, y2),
+                           MockAccessibleCaretEventHub::DragCaretState(),
+                           nsEventStatus_eConsumeNoDefault);
+
+  HandleEventAndCheckState(CreateTouchCancelEvent(x2, y2),
+                           MockAccessibleCaretEventHub::DragCaretState(),
+                           nsEventStatus_eIgnore);
+
+  HandleEventAndCheckState(CreateTouchEndEvent(x3, y3),
+                           MockAccessibleCaretEventHub::NoActionState(),
+                           nsEventStatus_eConsumeNoDefault);
+
+  HandleEventAndCheckState(CreateTouchCancelEvent(x3, y3),
+                           MockAccessibleCaretEventHub::NoActionState(),
+                           nsEventStatus_eIgnore);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestMouseLongTapWithSelectWordSuccessful)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestLongTapWithSelectWordSuccessful(CreateMousePressEvent,
+                                      CreateMouseReleaseEvent);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestTouchLongTapWithSelectWordSuccessful)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestLongTapWithSelectWordSuccessful(CreateTouchStartEvent,
+                                      CreateTouchEndEvent);
+}
+
+template <typename PressEventCreator, typename ReleaseEventCreator>
+void AccessibleCaretEventHubTester::TestLongTapWithSelectWordSuccessful(
+    PressEventCreator aPressEventCreator,
+    ReleaseEventCreator aReleaseEventCreator) {
+  MockFunction<void(::std::string aCheckPointName)> check;
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), PressCaret(_, _))
+        .WillOnce(Return(NS_ERROR_FAILURE));
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), SelectWordOrShortcut(_))
+        .WillOnce(Return(NS_OK));
+
+    EXPECT_CALL(check, Call("longtap with scrolling"));
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), PressCaret(_, _))
+        .WillOnce(Return(NS_ERROR_FAILURE));
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), SelectWordOrShortcut(_))
+        .WillOnce(Return(NS_OK));
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollStart());
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollEnd());
+  }
+
+  // Test long tap without scrolling.
+  HandleEventAndCheckState(aPressEventCreator(0, 0),
+                           MockAccessibleCaretEventHub::PressNoCaretState(),
+                           nsEventStatus_eIgnore);
+
+  HandleEventAndCheckState(CreateLongTapEvent(0, 0),
+                           MockAccessibleCaretEventHub::LongTapState(),
+                           nsEventStatus_eIgnore);
+
+  HandleEventAndCheckState(aReleaseEventCreator(0, 0),
+                           MockAccessibleCaretEventHub::NoActionState(),
+                           nsEventStatus_eIgnore);
+
+  // On Fennec, after long tap, the script might scroll and zoom the input field
+  // to the center of the screen to make typing easier before the user lifts the
+  // finger.
+  check.Call("longtap with scrolling");
+
+  HandleEventAndCheckState(aPressEventCreator(1, 1),
+                           MockAccessibleCaretEventHub::PressNoCaretState(),
+                           nsEventStatus_eIgnore);
+
+  HandleEventAndCheckState(CreateLongTapEvent(1, 1),
+                           MockAccessibleCaretEventHub::LongTapState(),
+                           nsEventStatus_eIgnore);
+
+  RefPtr<MockAccessibleCaretEventHub> hub(mHub);
+  hub->AsyncPanZoomStarted();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  hub->ScrollPositionChanged();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  hub->AsyncPanZoomStopped();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::NoActionState());
+
+  HandleEventAndCheckState(aReleaseEventCreator(1, 1),
+                           MockAccessibleCaretEventHub::NoActionState(),
+                           nsEventStatus_eIgnore);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestMouseLongTapWithSelectWordFailed)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestLongTapWithSelectWordFailed(CreateMousePressEvent,
+                                  CreateMouseReleaseEvent);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestTouchLongTapWithSelectWordFailed)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestLongTapWithSelectWordFailed(CreateTouchStartEvent, CreateTouchEndEvent);
+}
+
+template <typename PressEventCreator, typename ReleaseEventCreator>
+void AccessibleCaretEventHubTester::TestLongTapWithSelectWordFailed(
+    PressEventCreator aPressEventCreator,
+    ReleaseEventCreator aReleaseEventCreator) {
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), PressCaret(_, _))
+        .WillOnce(Return(NS_ERROR_FAILURE));
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), SelectWordOrShortcut(_))
+        .WillOnce(Return(NS_ERROR_FAILURE));
+  }
+
+  HandleEventAndCheckState(aPressEventCreator(0, 0),
+                           MockAccessibleCaretEventHub::PressNoCaretState(),
+                           nsEventStatus_eIgnore);
+
+  HandleEventAndCheckState(CreateLongTapEvent(0, 0),
+                           MockAccessibleCaretEventHub::LongTapState(),
+                           nsEventStatus_eIgnore);
+
+  HandleEventAndCheckState(aReleaseEventCreator(0, 0),
+                           MockAccessibleCaretEventHub::NoActionState(),
+                           nsEventStatus_eIgnore);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestTouchEventDrivenAsyncPanZoomScroll)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestEventDrivenAsyncPanZoomScroll(CreateTouchStartEvent, CreateTouchMoveEvent,
+                                    CreateTouchEndEvent);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestMouseEventDrivenAsyncPanZoomScroll)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  TestEventDrivenAsyncPanZoomScroll(CreateMousePressEvent, CreateMouseMoveEvent,
+                                    CreateMouseReleaseEvent);
+}
+
+template <typename PressEventCreator, typename MoveEventCreator,
+          typename ReleaseEventCreator>
+void AccessibleCaretEventHubTester::TestEventDrivenAsyncPanZoomScroll(
+    PressEventCreator aPressEventCreator, MoveEventCreator aMoveEventCreator,
+    ReleaseEventCreator aReleaseEventCreator) {
+  MockFunction<void(::std::string aCheckPointName)> check;
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), PressCaret(_, _))
+        .WillOnce(Return(NS_ERROR_FAILURE));
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), DragCaret(_)).Times(0);
+
+    EXPECT_CALL(check, Call("1"));
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollStart());
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollEnd());
+
+    EXPECT_CALL(check, Call("2"));
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), PressCaret(_, _))
+        .WillOnce(Return(NS_ERROR_FAILURE));
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), DragCaret(_)).Times(0);
+
+    EXPECT_CALL(check, Call("3"));
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollStart());
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollEnd());
+  }
+
+  // Receive press event.
+  HandleEventAndCheckState(aPressEventCreator(0, 0),
+                           MockAccessibleCaretEventHub::PressNoCaretState(),
+                           nsEventStatus_eIgnore);
+
+  HandleEventAndCheckState(aMoveEventCreator(100, 100),
+                           MockAccessibleCaretEventHub::PressNoCaretState(),
+                           nsEventStatus_eIgnore);
+
+  check.Call("1");
+
+  // Event driven scroll started
+  RefPtr<MockAccessibleCaretEventHub> hub(mHub);
+  hub->AsyncPanZoomStarted();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  HandleEventAndCheckState(aMoveEventCreator(160, 160),
+                           MockAccessibleCaretEventHub::ScrollState(),
+                           nsEventStatus_eIgnore);
+
+  hub->ScrollPositionChanged();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  // Event driven scroll ended
+  hub->AsyncPanZoomStopped();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::NoActionState());
+
+  HandleEventAndCheckState(aReleaseEventCreator(210, 210),
+                           MockAccessibleCaretEventHub::NoActionState(),
+                           nsEventStatus_eIgnore);
+
+  check.Call("2");
+
+  // Receive another press event.
+  HandleEventAndCheckState(aPressEventCreator(220, 220),
+                           MockAccessibleCaretEventHub::PressNoCaretState(),
+                           nsEventStatus_eIgnore);
+
+  HandleEventAndCheckState(aMoveEventCreator(230, 230),
+                           MockAccessibleCaretEventHub::PressNoCaretState(),
+                           nsEventStatus_eIgnore);
+
+  check.Call("3");
+
+  // Another APZ scroll started
+  hub->AsyncPanZoomStarted();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  hub->ScrollPositionChanged();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  // Another APZ scroll ended
+  hub->AsyncPanZoomStopped();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::NoActionState());
+
+  HandleEventAndCheckState(aReleaseEventCreator(310, 310),
+                           MockAccessibleCaretEventHub::NoActionState(),
+                           nsEventStatus_eIgnore);
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestAsyncPanZoomScroll)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION { TestAsyncPanZoomScroll(); }
+
+void AccessibleCaretEventHubTester::TestAsyncPanZoomScroll() {
+  MockFunction<void(::std::string aCheckPointName)> check;
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(check, Call("1"));
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollStart());
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(),
+                OnScrollPositionChanged());
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollEnd());
+
+    EXPECT_CALL(check, Call("2"));
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollStart());
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(),
+                OnScrollPositionChanged());
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollEnd());
+  }
+
+  // First APZ scrolling.
+  check.Call("1");
+
+  RefPtr<MockAccessibleCaretEventHub> hub(mHub);
+  hub->AsyncPanZoomStarted();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  hub->ScrollPositionChanged();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  hub->AsyncPanZoomStopped();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::NoActionState());
+
+  // Second APZ scrolling.
+  check.Call("2");
+
+  hub->AsyncPanZoomStarted();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  hub->ScrollPositionChanged();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  hub->AsyncPanZoomStopped();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::NoActionState());
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestAsyncPanZoomScrollStartedThenBlur)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollStart());
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollEnd()).Times(0);
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnBlur());
+  }
+
+  RefPtr<MockAccessibleCaretEventHub> hub(mHub);
+  hub->AsyncPanZoomStarted();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  hub->ScrollPositionChanged();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  hub->NotifyBlur(true);
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::NoActionState());
+}
+
+TEST_F(AccessibleCaretEventHubTester, TestAsyncPanZoomScrollEndedThenBlur)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollStart());
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnScrollEnd());
+    EXPECT_CALL(*mHub->GetMockAccessibleCaretManager(), OnBlur());
+  }
+
+  RefPtr<MockAccessibleCaretEventHub> hub(mHub);
+  hub->AsyncPanZoomStarted();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  hub->ScrollPositionChanged();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::ScrollState());
+
+  hub->AsyncPanZoomStopped();
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::NoActionState());
+
+  hub->NotifyBlur(true);
+  EXPECT_EQ(hub->GetState(), MockAccessibleCaretEventHub::NoActionState());
+}
+
+}  // namespace mozilla
diff --git a/layout/base/gtest/TestAccessibleCaretManager.cpp b/layout/base/gtest/TestAccessibleCaretManager.cpp
new file mode 100644
index 0000000000..464ad68fb0
--- /dev/null
+++ b/layout/base/gtest/TestAccessibleCaretManager.cpp
@@ -0,0 +1,848 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gtest/gtest.h"
+#include "gmock/gmock.h"
+
+#include <string>
+
+#include "AccessibleCaret.h"
+#include "AccessibleCaretManager.h"
+#include "mozilla/Preferences.h"
+
+using ::testing::_;
+using ::testing::DefaultValue;
+using ::testing::Eq;
+using ::testing::InSequence;
+using ::testing::MockFunction;
+using ::testing::Return;
+
+// -----------------------------------------------------------------------------
+// This file tests CaretStateChanged events and the appearance of the two
+// AccessibleCarets manipulated by AccessibleCaretManager.
+
+namespace mozilla {
+using dom::CaretChangedReason;
+
+class MOZ_RAII AutoRestoreBoolPref final {
+ public:
+  AutoRestoreBoolPref(const char* aPref, bool aValue) : mPref(aPref) {
+    Preferences::GetBool(mPref, &mOldValue);
+    Preferences::SetBool(mPref, aValue);
+  }
+
+  ~AutoRestoreBoolPref() { Preferences::SetBool(mPref, mOldValue); }
+
+ private:
+  const char* mPref = nullptr;
+  bool mOldValue = false;
+};
+
+class AccessibleCaretManagerTester : public ::testing::Test {
+ public:
+  class MockAccessibleCaret : public AccessibleCaret {
+   public:
+    MockAccessibleCaret() : AccessibleCaret(nullptr) {}
+
+    void SetAppearance(Appearance aAppearance) override {
+      // A simplified version without touching CaretElement().
+      mAppearance = aAppearance;
+    }
+
+    MOCK_METHOD2(SetPosition,
+                 PositionChangedResult(nsIFrame* aFrame, int32_t aOffset));
+
+  };  // class MockAccessibleCaret
+
+  class MockAccessibleCaretManager : public AccessibleCaretManager {
+   public:
+    using CaretMode = AccessibleCaretManager::CaretMode;
+    using AccessibleCaretManager::HideCaretsAndDispatchCaretStateChangedEvent;
+    using AccessibleCaretManager::UpdateCarets;
+
+    MockAccessibleCaretManager()
+        : AccessibleCaretManager(nullptr,
+                                 Carets{MakeUnique<MockAccessibleCaret>(),
+                                        MakeUnique<MockAccessibleCaret>()}) {}
+
+    MockAccessibleCaret& FirstCaret() {
+      return static_cast<MockAccessibleCaret&>(*mCarets.GetFirst());
+    }
+
+    MockAccessibleCaret& SecondCaret() {
+      return static_cast<MockAccessibleCaret&>(*mCarets.GetSecond());
+    }
+
+    bool CompareTreePosition(nsIFrame* aStartFrame,
+                             nsIFrame* aEndFrame) const override {
+      return true;
+    }
+
+    bool IsCaretDisplayableInCursorMode(
+        nsIFrame** aOutFrame = nullptr,
+        int32_t* aOutOffset = nullptr) const override {
+      return true;
+    }
+
+    bool UpdateCaretsForOverlappingTilt() override { return true; }
+
+    void UpdateCaretsForAlwaysTilt(const nsIFrame* aStartFrame,
+                                   const nsIFrame* aEndFrame) override {
+      if (mCarets.GetFirst()->IsVisuallyVisible()) {
+        mCarets.GetFirst()->SetAppearance(Appearance::Left);
+      }
+      if (mCarets.GetSecond()->IsVisuallyVisible()) {
+        mCarets.GetSecond()->SetAppearance(Appearance::Right);
+      }
+    }
+
+    Terminated IsTerminated() const override { return Terminated::No; }
+    bool IsScrollStarted() const { return mIsScrollStarted; }
+
+    Terminated MaybeFlushLayout() override { return Terminated::No; }
+
+    MOCK_CONST_METHOD0(GetCaretMode, CaretMode());
+    MOCK_METHOD2(DispatchCaretStateChangedEvent,
+                 void(CaretChangedReason aReason, const nsPoint* aPoint));
+    MOCK_CONST_METHOD1(HasNonEmptyTextContent, bool(nsINode* aNode));
+
+  };  // class MockAccessibleCaretManager
+
+  using Appearance = AccessibleCaret::Appearance;
+  using PositionChangedResult = AccessibleCaret::PositionChangedResult;
+  using CaretMode = MockAccessibleCaretManager::CaretMode;
+
+  AccessibleCaretManagerTester() {
+    DefaultValue<CaretMode>::Set(CaretMode::None);
+    DefaultValue<PositionChangedResult>::Set(PositionChangedResult::NotChanged);
+
+    EXPECT_CALL(mManager.FirstCaret(), SetPosition(_, _))
+        .WillRepeatedly(Return(PositionChangedResult::Position));
+
+    EXPECT_CALL(mManager.SecondCaret(), SetPosition(_, _))
+        .WillRepeatedly(Return(PositionChangedResult::Position));
+  }
+
+  AccessibleCaret::Appearance FirstCaretAppearance() {
+    return mManager.FirstCaret().GetAppearance();
+  }
+
+  AccessibleCaret::Appearance SecondCaretAppearance() {
+    return mManager.SecondCaret().GetAppearance();
+  }
+
+  // Member variables
+  MockAccessibleCaretManager mManager;
+
+};  // class AccessibleCaretManagerTester
+
+TEST_F(AccessibleCaretManagerTester, TestUpdatesInSelectionMode)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  // Set default preference.
+  AutoRestoreBoolPref savedPref("layout.accessiblecaret.always_tilt", false);
+
+  EXPECT_CALL(mManager, GetCaretMode())
+      .WillRepeatedly(Return(CaretMode::Selection));
+
+  EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                            CaretChangedReason::Updateposition, nullptr))
+      .Times(3);
+
+  mManager.UpdateCarets();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::Normal);
+
+  mManager.OnReflow();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::Normal);
+
+  mManager.OnScrollPositionChanged();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::Normal);
+}
+
+TEST_F(AccessibleCaretManagerTester, TestSingleTapOnNonEmptyInput)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  EXPECT_CALL(mManager, GetCaretMode())
+      .WillRepeatedly(Return(CaretMode::Cursor));
+
+  EXPECT_CALL(mManager, HasNonEmptyTextContent(_)).WillRepeatedly(Return(true));
+
+  MockFunction<void(std::string aCheckPointName)> check;
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("update"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Visibilitychange, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("mouse down"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(_, nullptr)).Times(0);
+    EXPECT_CALL(check, Call("reflow"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(_, nullptr)).Times(0);
+    EXPECT_CALL(check, Call("blur"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("mouse up"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("reflow2"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr))
+        .Times(1);
+  }
+
+  // Simulate a single tap on a non-empty input.
+  mManager.UpdateCarets();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  check.Call("update");
+
+  mManager.OnSelectionChanged(nullptr, nullptr,
+                              nsISelectionListener::DRAG_REASON |
+                                  nsISelectionListener::MOUSEDOWN_REASON);
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+  check.Call("mouse down");
+
+  mManager.OnReflow();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+  check.Call("reflow");
+
+  mManager.OnBlur();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+  check.Call("blur");
+
+  mManager.OnSelectionChanged(nullptr, nullptr,
+                              nsISelectionListener::MOUSEUP_REASON);
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  check.Call("mouse up");
+
+  mManager.OnReflow();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  check.Call("reflow2");
+
+  mManager.OnScrollPositionChanged();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+}
+
+TEST_F(AccessibleCaretManagerTester, TestSingleTapOnEmptyInput)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  // Set default preference.
+  AutoRestoreBoolPref savedPref(
+      "layout.accessiblecaret.caret_shown_when_long_tapping_on_empty_content",
+      false);
+
+  EXPECT_CALL(mManager, GetCaretMode())
+      .WillRepeatedly(Return(CaretMode::Cursor));
+
+  EXPECT_CALL(mManager, HasNonEmptyTextContent(_))
+      .WillRepeatedly(Return(false));
+
+  MockFunction<void(std::string aCheckPointName)> check;
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("update"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Visibilitychange, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("mouse down"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(_, nullptr)).Times(0);
+    EXPECT_CALL(check, Call("reflow"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(_, nullptr)).Times(0);
+    EXPECT_CALL(check, Call("blur"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("mouse up"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("reflow2"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr))
+        .Times(1);
+  }
+
+  // Simulate a single tap on an empty input.
+  mManager.UpdateCarets();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("update");
+
+  mManager.OnSelectionChanged(nullptr, nullptr,
+                              nsISelectionListener::DRAG_REASON |
+                                  nsISelectionListener::MOUSEDOWN_REASON);
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+  check.Call("mouse down");
+
+  mManager.OnReflow();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+  check.Call("reflow");
+
+  mManager.OnBlur();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+  check.Call("blur");
+
+  mManager.OnSelectionChanged(nullptr, nullptr,
+                              nsISelectionListener::MOUSEUP_REASON);
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("mouse up");
+
+  mManager.OnReflow();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("reflow2");
+
+  mManager.OnScrollPositionChanged();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+}
+
+TEST_F(AccessibleCaretManagerTester, TestTypingAtEndOfInput)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  EXPECT_CALL(mManager, GetCaretMode())
+      .WillRepeatedly(Return(CaretMode::Cursor));
+
+  EXPECT_CALL(mManager, HasNonEmptyTextContent(_)).WillRepeatedly(Return(true));
+
+  MockFunction<void(std::string aCheckPointName)> check;
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("update"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Visibilitychange, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("keyboard"));
+
+    // No CaretStateChanged events should be dispatched since the caret has
+    // being hidden in cursor mode.
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(_, nullptr)).Times(0);
+  }
+
+  // Simulate typing the end of the input.
+  mManager.UpdateCarets();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  check.Call("update");
+
+  mManager.OnKeyboardEvent();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+  check.Call("keyboard");
+
+  mManager.OnSelectionChanged(nullptr, nullptr,
+                              nsISelectionListener::NO_REASON);
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+
+  mManager.OnScrollPositionChanged();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+}
+
+TEST_F(AccessibleCaretManagerTester, TestScrollInSelectionMode)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  // Set default preference.
+  AutoRestoreBoolPref savedPref("layout.accessiblecaret.always_tilt", false);
+
+  EXPECT_CALL(mManager, GetCaretMode())
+      .WillRepeatedly(Return(CaretMode::Selection));
+
+  MockFunction<void(std::string aCheckPointName)> check;
+  {
+    InSequence dummy;
+
+    // Initially, first caret is out of scrollport, and second caret is visible.
+    EXPECT_CALL(mManager.FirstCaret(), SetPosition(_, _))
+        .WillOnce(Return(PositionChangedResult::Invisible));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("updatecarets"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Scroll, nullptr));
+    EXPECT_CALL(check, Call("scrollstart1"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("reflow1"));
+
+    // After scroll ended, first caret is visible and second caret is out of
+    // scroll port.
+    EXPECT_CALL(mManager.SecondCaret(), SetPosition(_, _))
+        .WillOnce(Return(PositionChangedResult::Invisible));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("scrollend1"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Scroll, nullptr));
+    EXPECT_CALL(check, Call("scrollstart2"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("reflow2"));
+
+    // After the scroll ended, both carets are visible.
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("scrollend2"));
+  }
+
+  mManager.UpdateCarets();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::Normal);
+  check.Call("updatecarets");
+
+  mManager.OnScrollStart();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::Normal);
+  check.Call("scrollstart1");
+
+  mManager.OnReflow();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::Normal);
+  check.Call("reflow1");
+
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("scrollend1");
+
+  mManager.OnScrollStart();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("scrollstart2");
+
+  mManager.OnReflow();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("reflow2");
+
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::Normal);
+  check.Call("scrollend2");
+}
+
+TEST_F(AccessibleCaretManagerTester,
+       TestScrollInSelectionModeWithAlwaysTiltPref)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  // Simulate Firefox Android preference.
+  AutoRestoreBoolPref savedPref("layout.accessiblecaret.always_tilt", true);
+
+  EXPECT_CALL(mManager, GetCaretMode())
+      .WillRepeatedly(Return(CaretMode::Selection));
+
+  MockFunction<void(std::string aCheckPointName)> check;
+  {
+    InSequence dummy;
+
+    // Initially, first caret is out of scrollport, and second caret is visible.
+    EXPECT_CALL(mManager.FirstCaret(), SetPosition(_, _))
+        .WillOnce(Return(PositionChangedResult::Invisible));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("updatecarets"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Scroll, nullptr));
+    EXPECT_CALL(check, Call("scrollstart1"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(_, nullptr)).Times(0);
+    EXPECT_CALL(check, Call("scrollPositionChanged1"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("reflow1"));
+
+    // After scroll ended, first caret is visible and second caret is out of
+    // scroll port.
+    EXPECT_CALL(mManager.SecondCaret(), SetPosition(_, _))
+        .WillOnce(Return(PositionChangedResult::Invisible));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("scrollend1"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Scroll, nullptr));
+    EXPECT_CALL(check, Call("scrollstart2"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(_, nullptr)).Times(0);
+    EXPECT_CALL(check, Call("scrollPositionChanged2"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("reflow2"));
+
+    // After the scroll ended, both carets are visible.
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("scrollend2"));
+  }
+
+  mManager.UpdateCarets();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::Right);
+  check.Call("updatecarets");
+
+  mManager.OnScrollStart();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::Right);
+  check.Call("scrollstart1");
+
+  mManager.OnScrollPositionChanged();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::Right);
+  check.Call("scrollPositionChanged1");
+
+  mManager.OnReflow();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::Right);
+  check.Call("reflow1");
+
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Left);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("scrollend1");
+
+  mManager.OnScrollStart();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Left);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("scrollstart2");
+
+  mManager.OnScrollPositionChanged();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Left);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("scrollPositionChanged2");
+
+  mManager.OnReflow();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Left);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("reflow2");
+
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Left);
+  EXPECT_EQ(SecondCaretAppearance(), Appearance::Right);
+  check.Call("scrollend2");
+}
+
+TEST_F(AccessibleCaretManagerTester, TestScrollInCursorModeWhenLogicallyVisible)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  EXPECT_CALL(mManager, GetCaretMode())
+      .WillRepeatedly(Return(CaretMode::Cursor));
+
+  EXPECT_CALL(mManager, HasNonEmptyTextContent(_)).WillRepeatedly(Return(true));
+
+  MockFunction<void(std::string aCheckPointName)> check;
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("updatecarets"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Scroll, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("scrollstart1"));
+
+    // After scroll ended, the caret is out of scroll port.
+    EXPECT_CALL(mManager.FirstCaret(), SetPosition(_, _))
+        .WillRepeatedly(Return(PositionChangedResult::Invisible));
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("scrollend1"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Scroll, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("scrollstart2"));
+
+    // After scroll ended, the caret is visible again.
+    EXPECT_CALL(mManager.FirstCaret(), SetPosition(_, _))
+        .WillRepeatedly(Return(PositionChangedResult::Position));
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("scrollend2"));
+  }
+
+  mManager.UpdateCarets();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  check.Call("updatecarets");
+
+  mManager.OnScrollStart();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  check.Call("scrollstart1");
+
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("scrollend1");
+
+  mManager.OnScrollStart();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("scrollstart2");
+
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  check.Call("scrollend2");
+}
+
+TEST_F(AccessibleCaretManagerTester, TestScrollInCursorModeWhenHidden)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  EXPECT_CALL(mManager, GetCaretMode())
+      .WillRepeatedly(Return(CaretMode::Cursor));
+
+  EXPECT_CALL(mManager, HasNonEmptyTextContent(_)).WillRepeatedly(Return(true));
+
+  MockFunction<void(std::string aCheckPointName)> check;
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("updatecarets"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Visibilitychange, nullptr))
+        .Times(1);
+    EXPECT_CALL(check, Call("hidecarets"));
+
+    // After scroll ended, the caret is out of scroll port.
+    EXPECT_CALL(mManager.FirstCaret(), SetPosition(_, _))
+        .WillRepeatedly(Return(PositionChangedResult::Invisible));
+    EXPECT_CALL(check, Call("scrollend1"));
+
+    // After scroll ended, the caret is visible again.
+    EXPECT_CALL(mManager.FirstCaret(), SetPosition(_, _))
+        .WillRepeatedly(Return(PositionChangedResult::Position));
+    EXPECT_CALL(check, Call("scrollend2"));
+  }
+
+  mManager.UpdateCarets();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  check.Call("updatecarets");
+
+  mManager.HideCaretsAndDispatchCaretStateChangedEvent();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+  check.Call("hidecarets");
+
+  mManager.OnScrollStart();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+  check.Call("scrollend1");
+
+  mManager.OnScrollStart();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+  check.Call("scrollend2");
+}
+
+TEST_F(AccessibleCaretManagerTester, TestScrollInCursorModeOnEmptyContent)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  // Set default preference.
+  AutoRestoreBoolPref savedPref(
+      "layout.accessiblecaret.caret_shown_when_long_tapping_on_empty_content",
+      false);
+
+  EXPECT_CALL(mManager, GetCaretMode())
+      .WillRepeatedly(Return(CaretMode::Cursor));
+
+  EXPECT_CALL(mManager, HasNonEmptyTextContent(_))
+      .WillRepeatedly(Return(false));
+
+  MockFunction<void(std::string aCheckPointName)> check;
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("updatecarets"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Scroll, nullptr));
+    EXPECT_CALL(check, Call("scrollstart1"));
+
+    EXPECT_CALL(mManager.FirstCaret(), SetPosition(_, _))
+        .WillOnce(Return(PositionChangedResult::Invisible));
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("scrollend1"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Scroll, nullptr));
+    EXPECT_CALL(check, Call("scrollstart2"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("scrollend2"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Scroll, nullptr));
+    EXPECT_CALL(check, Call("scrollstart3"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("scrollend3"));
+  }
+
+  // Simulate a pinch-zoom operation before tapping on an empty content.
+  mManager.OnScrollStart();
+  mManager.OnScrollEnd();
+  EXPECT_EQ(mManager.IsScrollStarted(), false);
+
+  // Simulate a single tap on an empty content.
+  mManager.UpdateCarets();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("updatecarets");
+
+  // Scroll the caret to be out of the viewport.
+  mManager.OnScrollStart();
+  check.Call("scrollstart1");
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("scrollend1");
+
+  // Scroll the caret into the viewport.
+  mManager.OnScrollStart();
+  check.Call("scrollstart2");
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("scrollend2");
+
+  // Scroll the caret within the viewport.
+  mManager.OnScrollStart();
+  check.Call("scrollstart3");
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("scrollend3");
+}
+
+TEST_F(AccessibleCaretManagerTester,
+       TestScrollInCursorModeWithCaretShownWhenLongTappingOnEmptyContentPref)
+MOZ_CAN_RUN_SCRIPT_FOR_DEFINITION {
+  // Simulate Firefox Android preference.
+  AutoRestoreBoolPref savedPref(
+      "layout.accessiblecaret.caret_shown_when_long_tapping_on_empty_content",
+      true);
+
+  EXPECT_CALL(mManager, GetCaretMode())
+      .WillRepeatedly(Return(CaretMode::Cursor));
+
+  EXPECT_CALL(mManager, HasNonEmptyTextContent(_))
+      .WillRepeatedly(Return(false));
+
+  MockFunction<void(std::string aCheckPointName)> check;
+  {
+    InSequence dummy;
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("singletap updatecarets"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("longtap updatecarets"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Scroll, nullptr));
+    EXPECT_CALL(check, Call("longtap scrollstart1"));
+
+    EXPECT_CALL(mManager.FirstCaret(), SetPosition(_, _))
+        .WillOnce(Return(PositionChangedResult::Invisible));
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("longtap scrollend1"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Scroll, nullptr));
+    EXPECT_CALL(check, Call("longtap scrollstart2"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("longtap scrollend2"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Scroll, nullptr));
+    EXPECT_CALL(check, Call("longtap scrollstart3"));
+
+    EXPECT_CALL(mManager, DispatchCaretStateChangedEvent(
+                              CaretChangedReason::Updateposition, nullptr));
+    EXPECT_CALL(check, Call("longtap scrollend3"));
+  }
+
+  // Simulate a single tap on an empty input.
+  mManager.FirstCaret().SetAppearance(Appearance::None);
+  mManager.UpdateCarets();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+  check.Call("singletap updatecarets");
+
+  // Scroll the caret within the viewport.
+  mManager.OnScrollStart();
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::None);
+
+  // Simulate a long tap on an empty input.
+  mManager.FirstCaret().SetAppearance(Appearance::Normal);
+  mManager.UpdateCarets();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  check.Call("longtap updatecarets");
+
+  // Scroll the caret to be out of the viewport.
+  mManager.OnScrollStart();
+  check.Call("longtap scrollstart1");
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::NormalNotShown);
+  check.Call("longtap scrollend1");
+
+  // Scroll the caret into the viewport.
+  mManager.OnScrollStart();
+  check.Call("longtap scrollstart2");
+  mManager.OnScrollPositionChanged();
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  check.Call("longtap scrollend2");
+
+  // Scroll the caret within the viewport.
+  mManager.OnScrollStart();
+  check.Call("longtap scrollstart3");
+  mManager.OnScrollPositionChanged();
+  mManager.OnScrollEnd();
+  EXPECT_EQ(FirstCaretAppearance(), Appearance::Normal);
+  check.Call("longtap scrollend3");
+}
+
+}  // namespace mozilla
diff --git a/layout/base/gtest/moz.build b/layout/base/gtest/moz.build
new file mode 100644
index 0000000000..b082855295
--- /dev/null
+++ b/layout/base/gtest/moz.build
@@ -0,0 +1,26 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+
+UNIFIED_SOURCES += [
+    "TestAccessibleCaretEventHub.cpp",
+    "TestAccessibleCaretManager.cpp",
+]
+
+# THE MOCK_METHOD2 macro from gtest triggers this clang warning and it's hard
+# to work around, so we just ignore it.
+if CONFIG["CC_TYPE"] == "clang":
+    CXXFLAGS += ["-Wno-inconsistent-missing-override"]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+LOCAL_INCLUDES += [
+    "/docshell/base",
+    "/layout/base",
+    "/layout/style",
+]
+
+FINAL_LIBRARY = "xul-gtest"