diff --git a/ReactCommon/react/renderer/attributedstring/tests/AttributedStringBoxTest.cpp b/ReactCommon/react/renderer/attributedstring/tests/AttributedStringBoxTest.cpp
new file mode 100644
index 00000000000..493598b2c42
--- /dev/null
+++ b/ReactCommon/react/renderer/attributedstring/tests/AttributedStringBoxTest.cpp
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <memory>
+
+#include <gtest/gtest.h>
+#include <react/renderer/attributedstring/AttributedStringBox.h>
+
+namespace facebook {
+namespace react {
+
+TEST(AttributedStringBoxTest, testDefaultConstructor) {
+  auto attributedStringBox = AttributedStringBox{};
+
+  EXPECT_EQ(attributedStringBox.getMode(), AttributedStringBox::Mode::Value);
+  EXPECT_EQ(attributedStringBox.getValue(), AttributedString{});
+}
+
+TEST(AttributedStringBoxTest, testValueConstructor) {
+  auto attributedString = AttributedString{};
+  auto fragment = AttributedString::Fragment{};
+  fragment.string = "test string";
+  attributedString.appendFragment(fragment);
+  auto attributedStringBox = AttributedStringBox{attributedString};
+
+  EXPECT_EQ(attributedStringBox.getMode(), AttributedStringBox::Mode::Value);
+  EXPECT_EQ(attributedStringBox.getValue(), attributedString);
+}
+
+TEST(AttributedStringBoxTest, testOpaquePointerConstructor) {
+  auto string = std::make_shared<std::string>("test string");
+  auto attributedStringBox = AttributedStringBox{string};
+
+  EXPECT_EQ(
+      attributedStringBox.getMode(), AttributedStringBox::Mode::OpaquePointer);
+  EXPECT_EQ(attributedStringBox.getOpaquePointer(), string);
+  EXPECT_EQ(string.use_count(), 2);
+}
+
+TEST(AttributedStringBoxTest, testMoveConstructor) {
+  {
+    auto string = std::make_shared<std::string>("test string");
+    auto movedFromAttributedStringBox = AttributedStringBox{string};
+
+    auto moveToAttributedStringBox =
+        AttributedStringBox{std::move(movedFromAttributedStringBox)};
+
+    EXPECT_EQ(
+        moveToAttributedStringBox.getMode(),
+        AttributedStringBox::Mode::OpaquePointer);
+    EXPECT_EQ(moveToAttributedStringBox.getOpaquePointer(), string);
+    EXPECT_EQ(string.use_count(), 2);
+  }
+  {
+    auto attributedString = AttributedString{};
+    auto fragment = AttributedString::Fragment{};
+    fragment.string = "test string";
+    attributedString.appendFragment(fragment);
+    auto movedFromAttributedStringBox = AttributedStringBox{attributedString};
+
+    auto moveToAttributedStringBox =
+        AttributedStringBox{std::move(movedFromAttributedStringBox)};
+
+    EXPECT_EQ(
+        moveToAttributedStringBox.getMode(), AttributedStringBox::Mode::Value);
+    EXPECT_EQ(moveToAttributedStringBox.getValue(), attributedString);
+  }
+}
+
+TEST(AttributedStringBoxTest, testMoveAssignment) {
+  {
+    auto string = std::make_shared<std::string>("test string");
+    auto movedFromAttributedStringBox = AttributedStringBox{string};
+
+    auto movedToAttributedStringBox = AttributedStringBox{};
+    movedToAttributedStringBox = std::move(movedFromAttributedStringBox);
+
+    EXPECT_EQ(
+        movedToAttributedStringBox.getMode(),
+        AttributedStringBox::Mode::OpaquePointer);
+    EXPECT_EQ(movedToAttributedStringBox.getOpaquePointer(), string);
+    EXPECT_EQ(string.use_count(), 2);
+  }
+  {
+    auto attributedString = AttributedString{};
+    auto fragment = AttributedString::Fragment{};
+    fragment.string = "test string";
+    attributedString.appendFragment(fragment);
+    auto movedFromAttributedStringBox = AttributedStringBox{attributedString};
+
+    auto moveToAttributedStringBox = AttributedStringBox{};
+    moveToAttributedStringBox = std::move(movedFromAttributedStringBox);
+
+    EXPECT_EQ(
+        moveToAttributedStringBox.getMode(), AttributedStringBox::Mode::Value);
+    EXPECT_EQ(moveToAttributedStringBox.getValue(), attributedString);
+  }
+}
+
+} // namespace react
+} // namespace facebook