diff --git a/packages/react-native/ReactCommon/jsinspector-modern/test/FallbackRuntimeAgentDelegateTest.cpp b/packages/react-native/ReactCommon/jsinspector-modern/test/FallbackRuntimeAgentDelegateTest.cpp
new file mode 100644
index 000000000000..a867843d9a3b
--- /dev/null
+++ b/packages/react-native/ReactCommon/jsinspector-modern/test/FallbackRuntimeAgentDelegateTest.cpp
@@ -0,0 +1,107 @@
+/*
+ * 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 <folly/json.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include <chrono>
+#include <string>
+#include <string_view>
+#include <utility>
+#include <vector>
+
+#include <jsinspector-modern/FallbackRuntimeTargetDelegate.h>
+#include <jsinspector-modern/RuntimeAgentDelegate.h>
+
+using namespace ::testing;
+
+namespace facebook::react::jsinspector_modern {
+
+class FallbackRuntimeAgentDelegateTest : public Test {
+ protected:
+  FrontendChannel frontendChannel() {
+    return [this](std::string_view message) {
+      messages_.push_back(folly::parseJson(message));
+    };
+  }
+
+  std::unique_ptr<RuntimeAgentDelegate> createDelegate(
+      SessionState& sessionState,
+      std::string engineDescription) {
+    FallbackRuntimeTargetDelegate targetDelegate(std::move(engineDescription));
+    return targetDelegate.createAgentDelegate(
+        frontendChannel(), sessionState, nullptr, {}, {});
+  }
+
+  std::vector<folly::dynamic> messages_;
+};
+
+TEST_F(
+    FallbackRuntimeAgentDelegateTest,
+    testConstructorWithLogEnabledSendsWarning) {
+  using namespace std::chrono;
+
+  SessionState sessionState;
+  sessionState.isLogDomainEnabled = true;
+  const std::string engineDescription = "Example \"Canary\" Engine";
+  const auto beforeConstruction =
+      duration_cast<milliseconds>(system_clock::now().time_since_epoch())
+          .count();
+
+  auto delegate = createDelegate(sessionState, engineDescription);
+
+  const auto afterConstruction =
+      duration_cast<milliseconds>(system_clock::now().time_since_epoch())
+          .count();
+  ASSERT_EQ(messages_.size(), 1);
+  const auto& notification = messages_.front();
+  EXPECT_EQ(notification.at("method"), "Log.entryAdded");
+
+  const auto& entry = notification.at("params").at("entry");
+  EXPECT_EQ(entry.at("source"), "other");
+  EXPECT_EQ(entry.at("level"), "warning");
+  EXPECT_THAT(entry.at("text").getString(), HasSubstr(engineDescription));
+  EXPECT_GE(entry.at("timestamp").getInt(), beforeConstruction);
+  EXPECT_LE(entry.at("timestamp").getInt(), afterConstruction);
+}
+
+TEST_F(
+    FallbackRuntimeAgentDelegateTest,
+    testHandleRequestLogEnableSendsWarningWithoutClaimingRequest) {
+  SessionState sessionState;
+  auto delegate = createDelegate(sessionState, "Deferred Engine");
+  ASSERT_TRUE(messages_.empty());
+
+  const bool handled = delegate->handleRequest(cdp::preparse(R"({
+    "id": 17,
+    "method": "Log.enable"
+  })"));
+
+  EXPECT_FALSE(handled);
+  ASSERT_EQ(messages_.size(), 1);
+  const auto& notification = messages_.front();
+  EXPECT_EQ(notification.at("method"), "Log.entryAdded");
+  EXPECT_EQ(notification.at("params").at("entry").at("level"), "warning");
+}
+
+TEST_F(
+    FallbackRuntimeAgentDelegateTest,
+    testHandleRequestNonEnableMethodDoesNotSendWarningOrClaimRequest) {
+  SessionState sessionState;
+  auto delegate = createDelegate(sessionState, "Boundary Engine");
+
+  const bool handled = delegate->handleRequest(cdp::preparse(R"({
+    "id": 23,
+    "method": "Log.enableExtra"
+  })"));
+
+  EXPECT_FALSE(handled);
+  EXPECT_TRUE(messages_.empty());
+}
+
+} // namespace facebook::react::jsinspector_modern