diff --git a/packages/react-native/ReactCommon/react/renderer/components/text/tests/HostPlatformParagraphPropsTest.cpp b/packages/react-native/ReactCommon/react/renderer/components/text/tests/HostPlatformParagraphPropsTest.cpp
new file mode 100644
index 000000000000..3c3fc503d8d8
--- /dev/null
+++ b/packages/react-native/ReactCommon/react/renderer/components/text/tests/HostPlatformParagraphPropsTest.cpp
@@ -0,0 +1,151 @@
+/*
+ * 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/renderer/components/text/HostPlatformParagraphProps.h>
+
+#include <gtest/gtest.h>
+
+// HostPlatformParagraphProps in this .cpp file is the Android-specific
+// implementation. On non-Android platforms `HostPlatformParagraphProps` is a
+// type alias to `BaseParagraphProps`, the Android-only fields
+// (`disabled`, `selectionColor`, `dataDetectorType`) do not exist, and
+// `getDiffProps` / `getDiffPropsImplementationTarget` are not defined. Guard
+// the tests with `RN_SERIALIZABLE_STATE`, which is only defined for the
+// Android build, so they compile and run only where the code under test
+// actually exists.
+#ifdef RN_SERIALIZABLE_STATE
+
+#include <react/renderer/components/text/primitives.h>
+#include <react/renderer/graphics/Color.h>
+
+namespace facebook::react {
+
+namespace {
+
+folly::dynamic diffAgainstDefault(const HostPlatformParagraphProps& props) {
+  const HostPlatformParagraphProps defaultProps{};
+  return props.getDiffProps(&defaultProps);
+}
+
+} // namespace
+
+TEST(HostPlatformParagraphPropsTest, getDiffPropsEmitsDisabledWhenChanged) {
+  HostPlatformParagraphProps props;
+  props.disabled = true;
+
+  auto diff = diffAgainstDefault(props);
+
+  ASSERT_TRUE(diff.isObject());
+  ASSERT_NE(diff.find("disabled"), diff.items().end());
+  EXPECT_TRUE(diff["disabled"].asBool());
+}
+
+TEST(
+    HostPlatformParagraphPropsTest,
+    getDiffPropsOmitsDisabledWhenUnchangedBetweenIdenticalProps) {
+  HostPlatformParagraphProps oldProps;
+  oldProps.disabled = true;
+  HostPlatformParagraphProps newProps;
+  newProps.disabled = true;
+
+  auto diff = newProps.getDiffProps(&oldProps);
+
+  EXPECT_EQ(diff.find("disabled"), diff.items().end());
+}
+
+TEST(
+    HostPlatformParagraphPropsTest,
+    getDiffPropsSerializesSelectionColorValueWhenSet) {
+  HostPlatformParagraphProps props;
+  // Use a non-default color so the diff branch is taken and we can assert
+  // on the serialized integer representation.
+  auto color = colorFromRGBA(/*r=*/10, /*g=*/20, /*b=*/30, /*a=*/255);
+  props.selectionColor = color;
+
+  auto diff = diffAgainstDefault(props);
+
+  ASSERT_NE(diff.find("selectionColor"), diff.items().end());
+  // `selectionColor` is serialized via the `toDynamic(SharedColor)` helper,
+  // which dereferences the underlying `Color`. The result must equal the
+  // dynamic representation of the same `Color`.
+  EXPECT_EQ(diff["selectionColor"], folly::dynamic(*color));
+}
+
+TEST(
+    HostPlatformParagraphPropsTest,
+    getDiffPropsSerializesSelectionColorAsNullWhenClearedFromPrevious) {
+  HostPlatformParagraphProps oldProps;
+  oldProps.selectionColor = colorFromRGBA(255, 0, 0, 255);
+  HostPlatformParagraphProps newProps;
+  // newProps.selectionColor is std::nullopt by default — simulates the user
+  // clearing the prop.
+
+  auto diff = newProps.getDiffProps(&oldProps);
+
+  ASSERT_NE(diff.find("selectionColor"), diff.items().end());
+  EXPECT_TRUE(diff["selectionColor"].isNull());
+}
+
+TEST(
+    HostPlatformParagraphPropsTest,
+    getDiffPropsSerializesDataDetectorTypeAsString) {
+  HostPlatformParagraphProps props;
+  props.dataDetectorType = DataDetectorType::PhoneNumber;
+
+  auto diff = diffAgainstDefault(props);
+
+  ASSERT_NE(diff.find("dataDetectorType"), diff.items().end());
+  // The diff stores the stringified enum (see `toString(DataDetectorType)`),
+  // not the raw integer — a regression that drops the conversion would fail
+  // this assertion.
+  EXPECT_EQ(diff["dataDetectorType"].asString(), "phoneNumber");
+}
+
+TEST(
+    HostPlatformParagraphPropsTest,
+    getDiffPropsForwardsParagraphAttributeChanges) {
+  HostPlatformParagraphProps props;
+  props.paragraphAttributes.maximumNumberOfLines = 3;
+  props.paragraphAttributes.ellipsizeMode = EllipsizeMode::Middle;
+  props.isSelectable = true;
+
+  auto diff = diffAgainstDefault(props);
+
+  // The diff bundles paragraph-level attribute changes alongside the
+  // host-platform-specific fields. These keys must be present with the
+  // values we set.
+  ASSERT_NE(diff.find("numberOfLines"), diff.items().end());
+  EXPECT_EQ(diff["numberOfLines"].asInt(), 3);
+
+  ASSERT_NE(diff.find("ellipsizeMode"), diff.items().end());
+  EXPECT_EQ(diff["ellipsizeMode"].asString(), "middle");
+
+  ASSERT_NE(diff.find("selectable"), diff.items().end());
+  EXPECT_TRUE(diff["selectable"].asBool());
+}
+
+TEST(
+    HostPlatformParagraphPropsTest,
+    getDiffPropsUsesDefaultsWhenPrevPropsIsNull) {
+  HostPlatformParagraphProps props;
+  props.disabled = true;
+  props.dataDetectorType = DataDetectorType::Email;
+
+  // Passing nullptr must fall back to a default-constructed instance for
+  // comparison, so non-default fields still appear in the diff.
+  auto diff = props.getDiffProps(/*prevProps=*/nullptr);
+
+  ASSERT_NE(diff.find("disabled"), diff.items().end());
+  EXPECT_TRUE(diff["disabled"].asBool());
+
+  ASSERT_NE(diff.find("dataDetectorType"), diff.items().end());
+  EXPECT_EQ(diff["dataDetectorType"].asString(), "email");
+}
+
+} // namespace facebook::react
+
+#endif // RN_SERIALIZABLE_STATE