diff --git a/interfaces/test/unittest/js/mod_fs/class_watcher/watcher_entity_test.cpp b/interfaces/test/unittest/js/mod_fs/class_watcher/watcher_entity_test.cpp
index f3924031b36ad9062b839a98a80229e6ea2d3d79..08761f487dad713c4451c76e24010ffc5d26910e 100644
--- a/interfaces/test/unittest/js/mod_fs/class_watcher/watcher_entity_test.cpp
+++ b/interfaces/test/unittest/js/mod_fs/class_watcher/watcher_entity_test.cpp
@@ -230,4 +230,84 @@ HWTEST_F(WatcherEntityTest, WatcherEntityTest_InitNotify_003, testing::ext::Test
     GTEST_LOG_(INFO) << "WatcherEntityTest-end WatcherEntityTest_InitNotify_003";
 }
 
+/**
+ * @tc.name: WatcherEntityTest_ReadNotifyEvent_001
+ * @tc.desc: Test function of WatcherEntityTest::ReadNotifyEvent interface for SUCCESS when read valid event data.
+ * @tc.size: MEDIUM
+ * @tc.type: FUNC
+ * @tc.level Level 1
+ */
+HWTEST_F(WatcherEntityTest, WatcherEntityTest_ReadNotifyEvent_001, testing::ext::TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "WatcherEntityTest-begin WatcherEntityTest_ReadNotifyEvent_001";
+
+    auto &watcher = FileWatcher::GetInstance();
+    int32_t len = static_cast<int32_t>(sizeof(struct inotify_event));
+    WatcherCallback callback = nullptr;
+
+    auto unistdMock = UnistdMock::GetMock();
+    EXPECT_CALL(*unistdMock, read(testing::_, testing::_, testing::_)).Times(1).WillOnce(testing::Return(len));
+
+    watcher.ReadNotifyEvent(callback);
+    testing::Mock::VerifyAndClearExpectations(unistdMock.get());
+
+    GTEST_LOG_(INFO) << "WatcherEntityTest-end WatcherEntityTest_ReadNotifyEvent_001";
+}
+ 
+/**
+ * @tc.name: WatcherEntityTest_ReadNotifyEvent_002
+ * @tc.desc: Test first if branch - remaining data < sizeof(inotify_event)
+ * @tc.size: MEDIUM
+ * @tc.type: FUNC
+ * @tc.level Level 1
+ */
+HWTEST_F(WatcherEntityTest, WatcherEntityTest_ReadNotifyEvent_002, testing::ext::TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "WatcherEntityTest-begin WatcherEntityTest_ReadNotifyEvent_002";
+
+    auto &watcher = FileWatcher::GetInstance();
+    int32_t eventSize = static_cast<int32_t>(sizeof(struct inotify_event));
+    int32_t partialSize = eventSize - 4;
+    WatcherCallback callback = nullptr;
+
+    auto unistdMock = UnistdMock::GetMock();
+    EXPECT_CALL(*unistdMock, read(testing::_, testing::_, testing::_)).Times(1).WillOnce(testing::Return(partialSize));
+
+    watcher.ReadNotifyEvent(callback);
+    testing::Mock::VerifyAndClearExpectations(unistdMock.get());
+
+    GTEST_LOG_(INFO) << "WatcherEntityTest-end WatcherEntityTest_ReadNotifyEvent_002";
+}
+ 
+/**
+ * @tc.name: WatcherEntityTest_ReadNotifyEvent_003
+ * @tc.desc: Test second if branch - event->len exceeds available buffer
+ * @tc.size: SMALL
+ * @tc.type: FUNC
+ * @tc.level Level 1
+ */
+HWTEST_F(WatcherEntityTest, WatcherEntityTest_ReadNotifyEvent_003, testing::ext::TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "WatcherEntityTest-begin WatcherEntityTest_ReadNotifyEvent_003";
+
+    auto &watcher = FileWatcher::GetInstance();
+    int32_t eventSize = static_cast<int32_t>(sizeof(struct inotify_event));
+    uint32_t nameLen = 20;
+    int32_t bufferSize = eventSize + 10;
+    WatcherCallback callback = nullptr;
+
+    char buf[BUF_SIZE] = {0};
+    struct inotify_event* mockEvent = reinterpret_cast<inotify_event*>(buf);
+    mockEvent->wd = 1;
+    mockEvent->len = nameLen;
+
+    auto unistdMock = UnistdMock::GetMock();
+    EXPECT_CALL(*unistdMock, read(testing::_, testing::_, testing::_)).Times(1).WillOnce(testing::Return(bufferSize));
+
+    watcher.ReadNotifyEvent(callback);
+    testing::Mock::VerifyAndClearExpectations(unistdMock.get());
+
+    GTEST_LOG_(INFO) << "WatcherEntityTest-end WatcherEntityTest_ReadNotifyEvent_003";
+}
+
 } // namespace OHOS::FileManagement::ModuleFileIO::Test
\ No newline at end of file