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diff --git a/gfx/layers/apz/test/gtest/InputUtils.h b/gfx/layers/apz/test/gtest/InputUtils.h
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+++ b/gfx/layers/apz/test/gtest/InputUtils.h
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+/* -*- 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/. */
+
+#ifndef mozilla_layers_InputUtils_h
+#define mozilla_layers_InputUtils_h
+
+/**
+ * Defines a set of utility functions for generating input events
+ * to an APZC/APZCTM during APZ gtests.
+ */
+
+#include "APZTestCommon.h"
+
+/* The InputReceiver template parameter used in the helper functions below needs
+ * to be a class that implements functions with the signatures:
+ * APZEventResult ReceiveInputEvent(const InputData& aEvent);
+ * void SetAllowedTouchBehavior(uint64_t aInputBlockId,
+ *                              const nsTArray<uint32_t>& aBehaviours);
+ * The classes that currently implement these are APZCTreeManager and
+ * TestAsyncPanZoomController. Using this template allows us to test individual
+ * APZC instances in isolation and also an entire APZ tree, while using the same
+ * code to dispatch input events.
+ */
+
+template <class InputReceiver>
+void SetDefaultAllowedTouchBehavior(const RefPtr<InputReceiver>& aTarget,
+                                    uint64_t aInputBlockId,
+                                    int touchPoints = 1) {
+  nsTArray<uint32_t> defaultBehaviors;
+  // use the default value where everything is allowed
+  for (int i = 0; i < touchPoints; i++) {
+    defaultBehaviors.AppendElement(
+        mozilla::layers::AllowedTouchBehavior::HORIZONTAL_PAN |
+        mozilla::layers::AllowedTouchBehavior::VERTICAL_PAN |
+        mozilla::layers::AllowedTouchBehavior::PINCH_ZOOM |
+        mozilla::layers::AllowedTouchBehavior::ANIMATING_ZOOM);
+  }
+  aTarget->SetAllowedTouchBehavior(aInputBlockId, defaultBehaviors);
+}
+
+inline MultiTouchInput CreateMultiTouchInput(
+    MultiTouchInput::MultiTouchType aType, TimeStamp aTime) {
+  return MultiTouchInput(aType, MillisecondsSinceStartup(aTime), aTime, 0);
+}
+
+template <class InputReceiver>
+APZEventResult TouchDown(const RefPtr<InputReceiver>& aTarget,
+                         const ScreenIntPoint& aPoint, TimeStamp aTime) {
+  MultiTouchInput mti =
+      CreateMultiTouchInput(MultiTouchInput::MULTITOUCH_START, aTime);
+  mti.mTouches.AppendElement(CreateSingleTouchData(0, aPoint));
+  return aTarget->ReceiveInputEvent(mti);
+}
+
+template <class InputReceiver>
+APZEventResult TouchMove(const RefPtr<InputReceiver>& aTarget,
+                         const ScreenIntPoint& aPoint, TimeStamp aTime) {
+  MultiTouchInput mti =
+      CreateMultiTouchInput(MultiTouchInput::MULTITOUCH_MOVE, aTime);
+  mti.mTouches.AppendElement(CreateSingleTouchData(0, aPoint));
+  return aTarget->ReceiveInputEvent(mti);
+}
+
+template <class InputReceiver>
+APZEventResult TouchUp(const RefPtr<InputReceiver>& aTarget,
+                       const ScreenIntPoint& aPoint, TimeStamp aTime) {
+  MultiTouchInput mti =
+      CreateMultiTouchInput(MultiTouchInput::MULTITOUCH_END, aTime);
+  mti.mTouches.AppendElement(CreateSingleTouchData(0, aPoint));
+  return aTarget->ReceiveInputEvent(mti);
+}
+
+template <class InputReceiver>
+APZEventResult Wheel(const RefPtr<InputReceiver>& aTarget,
+                     const ScreenIntPoint& aPoint, const ScreenPoint& aDelta,
+                     TimeStamp aTime) {
+  ScrollWheelInput input(aTime, 0, ScrollWheelInput::SCROLLMODE_INSTANT,
+                         ScrollWheelInput::SCROLLDELTA_PIXEL, aPoint, aDelta.x,
+                         aDelta.y, false, WheelDeltaAdjustmentStrategy::eNone);
+  return aTarget->ReceiveInputEvent(input);
+}
+
+template <class InputReceiver>
+APZEventResult SmoothWheel(const RefPtr<InputReceiver>& aTarget,
+                           const ScreenIntPoint& aPoint,
+                           const ScreenPoint& aDelta, TimeStamp aTime) {
+  ScrollWheelInput input(aTime, 0, ScrollWheelInput::SCROLLMODE_SMOOTH,
+                         ScrollWheelInput::SCROLLDELTA_LINE, aPoint, aDelta.x,
+                         aDelta.y, false, WheelDeltaAdjustmentStrategy::eNone);
+  return aTarget->ReceiveInputEvent(input);
+}
+
+template <class InputReceiver>
+APZEventResult MouseDown(const RefPtr<InputReceiver>& aTarget,
+                         const ScreenIntPoint& aPoint, TimeStamp aTime) {
+  MouseInput input(MouseInput::MOUSE_DOWN,
+                   MouseInput::ButtonType::PRIMARY_BUTTON, 0, 0, aPoint, aTime,
+                   0);
+  return aTarget->ReceiveInputEvent(input);
+}
+
+template <class InputReceiver>
+APZEventResult MouseMove(const RefPtr<InputReceiver>& aTarget,
+                         const ScreenIntPoint& aPoint, TimeStamp aTime) {
+  MouseInput input(MouseInput::MOUSE_MOVE,
+                   MouseInput::ButtonType::PRIMARY_BUTTON, 0, 0, aPoint, aTime,
+                   0);
+  return aTarget->ReceiveInputEvent(input);
+}
+
+template <class InputReceiver>
+APZEventResult MouseUp(const RefPtr<InputReceiver>& aTarget,
+                       const ScreenIntPoint& aPoint, TimeStamp aTime) {
+  MouseInput input(MouseInput::MOUSE_UP, MouseInput::ButtonType::PRIMARY_BUTTON,
+                   0, 0, aPoint, aTime, 0);
+  return aTarget->ReceiveInputEvent(input);
+}
+
+template <class InputReceiver>
+APZEventResult PanGesture(PanGestureInput::PanGestureType aType,
+                          const RefPtr<InputReceiver>& aTarget,
+                          const ScreenIntPoint& aPoint,
+                          const ScreenPoint& aDelta, TimeStamp aTime,
+                          Modifiers aModifiers = MODIFIER_NONE,
+                          bool aSimulateMomentum = false) {
+  PanGestureInput input(aType, aTime, aPoint, aDelta, aModifiers);
+  input.mSimulateMomentum = aSimulateMomentum;
+  if constexpr (std::is_same_v<InputReceiver, TestAsyncPanZoomController>) {
+    // In the case of TestAsyncPanZoomController we know for sure that the
+    // event will be handled by APZ so set it explicitly.
+    input.mHandledByAPZ = true;
+  }
+  return aTarget->ReceiveInputEvent(input);
+}
+
+template <class InputReceiver>
+APZEventResult PanGestureWithModifiers(PanGestureInput::PanGestureType aType,
+                                       Modifiers aModifiers,
+                                       const RefPtr<InputReceiver>& aTarget,
+                                       const ScreenIntPoint& aPoint,
+                                       const ScreenPoint& aDelta,
+                                       TimeStamp aTime) {
+  return PanGesture(aType, aTarget, aPoint, aDelta, aTime, aModifiers);
+}
+
+#endif  // mozilla_layers_InputUtils_h