1 files changed, 37 insertions, 0 deletions
diff --git a/gfx/layers/apz/test/gtest/MockHitTester.h b/gfx/layers/apz/test/gtest/MockHitTester.h
new file mode 100644
index 0000000000..9c91b31152
--- /dev/null
+++ b/gfx/layers/apz/test/gtest/MockHitTester.h
@@ -0,0 +1,37 @@
+/* -*- 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_MockHitTester_h
+#define mozilla_layers_MockHitTester_h
+
+#include "apz/src/IAPZHitTester.h"
+#include "mozilla/gfx/CompositorHitTestInfo.h"
+
+#include <queue>
+
+namespace mozilla::layers {
+
+// IAPZHitTester implementation for APZ gtests.
+// This does not actually perform hit-testing, it just allows
+// the test code to specify the expected hit test results.
+class MockHitTester final : public IAPZHitTester {
+ public:
+  HitTestResult GetAPZCAtPoint(
+      const ScreenPoint& aHitTestPoint,
+      const RecursiveMutexAutoLock& aProofOfTreeLock) override;
+
+  // Queue a hit test result whose target APZC is the APZC
+  // with scroll id |aScrollId|, and the provided hit test flags.
+  void QueueHitResult(ScrollableLayerGuid::ViewID aScrollId,
+                      gfx::CompositorHitTestInfo aHitInfo);
+
+ private:
+  std::queue<HitTestResult> mQueuedResults;
+};
+
+}  // namespace mozilla::layers
+
+#endif  // define mozilla_layers_MockHitTester_h