From 6b0dd30c69b965a7e3e9edfb182f50c6743cd751 Mon Sep 17 00:00:00 2001
From: DevmateUtgenCppGeneralFBOrg Bot <noreply+1563563004708334@fb.com>
Date: Tue, 8 Sep 2026 03:10:59 -0700
Subject: [PATCH] 
 xplat/js/react-native-github/packages/react-native/ReactAndroid/src/main/jni/react/fabric/AndroidEventBeat.cpp

Reviewed By: cortinico

Differential Revision: D119132731
---
 .../fabric/test/AndroidEventBeatTest.cpp      | 137 ++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 packages/react-native/ReactAndroid/src/main/jni/react/fabric/test/AndroidEventBeatTest.cpp

diff --git a/packages/react-native/ReactAndroid/src/main/jni/react/fabric/test/AndroidEventBeatTest.cpp b/packages/react-native/ReactAndroid/src/main/jni/react/fabric/test/AndroidEventBeatTest.cpp
new file mode 100644
index 000000000000..954a711883fb
--- /dev/null
+++ b/packages/react-native/ReactAndroid/src/main/jni/react/fabric/test/AndroidEventBeatTest.cpp
@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <react/fabric/AndroidEventBeat.h>
+
+#include <fbjni/fbjni.h>
+#include <gtest/gtest.h>
+#include <hermes/hermes.h>
+#include <react/featureflags/ReactNativeFeatureFlags.h>
+#include <react/featureflags/ReactNativeFeatureFlagsDefaults.h>
+#include <react/renderer/runtimescheduler/RuntimeScheduler.h>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace facebook::react {
+
+class EventBeatTestAccess : public EventBeat {
+ public:
+  using EventBeat::EventBeat;
+
+  static void markRequested(EventBeat& eventBeat) {
+    eventBeat.*requestedMember() = true;
+  }
+
+ private:
+  static std::atomic<bool> EventBeat::* requestedMember() {
+    return &EventBeatTestAccess::isEventBeatRequested_;
+  }
+};
+
+class AndroidEventBeatTestFeatureFlags
+    : public ReactNativeFeatureFlagsDefaults {
+ public:
+  bool enableBridgelessArchitecture() override {
+    return false;
+  }
+};
+
+class AndroidEventBeatTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    ReactNativeFeatureFlags::dangerouslyReset();
+    ReactNativeFeatureFlags::override(
+        std::make_unique<AndroidEventBeatTestFeatureFlags>());
+
+    runtime_ = facebook::hermes::makeHermesRuntime();
+    runtimeScheduler_ = std::make_unique<RuntimeScheduler>(
+        [this](std::function<void(jsi::Runtime & runtime)>&& callback) {
+          callback(*runtime_);
+        });
+  }
+
+  void TearDown() override {
+    runtimeScheduler_.reset();
+    runtime_.reset();
+    ReactNativeFeatureFlags::dangerouslyReset();
+  }
+
+  std::unique_ptr<AndroidEventBeat> makeEventBeat(
+      std::shared_ptr<const void> owner) {
+    auto ownerBox = std::make_shared<EventBeat::OwnerBox>();
+    ownerBox->owner = owner;
+    return std::make_unique<AndroidEventBeat>(
+        std::move(ownerBox),
+        &eventBeatManager_,
+        *runtimeScheduler_,
+        jni::global_ref<jobject>{});
+  }
+
+  EventBeatManager eventBeatManager_;
+  std::unique_ptr<facebook::hermes::HermesRuntime> runtime_;
+  std::unique_ptr<RuntimeScheduler> runtimeScheduler_;
+};
+
+TEST_F(AndroidEventBeatTest, testTickRunsCallbackForPendingBeat) {
+  auto owner = std::make_shared<int>(1);
+  auto eventBeat = makeEventBeat(owner);
+  std::vector<std::string> calls;
+
+  eventBeat->unstable_setInduceCallback(
+      [&calls]() { calls.push_back("induce"); });
+  eventBeat->setBeatCallback([&](jsi::Runtime& runtime) {
+    EXPECT_EQ(&runtime, runtime_.get());
+    calls.push_back("beat");
+  });
+
+  EventBeatTestAccess::markRequested(*eventBeat);
+  eventBeat->tick();
+
+  EXPECT_EQ(calls, (std::vector<std::string>{"induce", "beat"}));
+}
+
+TEST_F(AndroidEventBeatTest, testTickConsumesOnlyOnePendingBeat) {
+  auto owner = std::make_shared<int>(1);
+  auto eventBeat = makeEventBeat(owner);
+  int beatCallbackCount = 0;
+  int induceCallbackCount = 0;
+
+  eventBeat->unstable_setInduceCallback(
+      [&induceCallbackCount]() { ++induceCallbackCount; });
+  eventBeat->setBeatCallback(
+      [&beatCallbackCount](jsi::Runtime& /*runtime*/) { ++beatCallbackCount; });
+
+  EventBeatTestAccess::markRequested(*eventBeat);
+  eventBeat->tick();
+  eventBeat->tick();
+
+  EXPECT_EQ(induceCallbackCount, 1);
+  EXPECT_EQ(beatCallbackCount, 1);
+}
+
+TEST_F(AndroidEventBeatTest, testTickDoesNotRunBeatCallbackAfterOwnerExpires) {
+  auto owner = std::make_shared<int>(1);
+  auto eventBeat = makeEventBeat(owner);
+  int induceCallbackCount = 0;
+  int beatCallbackCount = 0;
+
+  eventBeat->unstable_setInduceCallback(
+      [&induceCallbackCount]() { ++induceCallbackCount; });
+  eventBeat->setBeatCallback(
+      [&beatCallbackCount](jsi::Runtime& /*runtime*/) { ++beatCallbackCount; });
+
+  EventBeatTestAccess::markRequested(*eventBeat);
+  owner.reset();
+  eventBeat->tick();
+
+  EXPECT_EQ(induceCallbackCount, 1);
+  EXPECT_EQ(beatCallbackCount, 0);
+}
+
+} // namespace facebook::react