diff --git a/app/test/test_bug551_XieShangHai.py b/app/test/test_bug551_XieShangHai.py
new file mode 100644
index 0000000..b23b312
--- /dev/null
+++ b/app/test/test_bug551_XieShangHai.py
@@ -0,0 +1,30 @@
+from selenium.webdriver.common.action_chains import ActionChains
+import time
+from helper import signup
+
+def test_highlight(driver, URL):
+    try:
+        # 打开网页
+        driver.maximize_window()
+        driver.get(URL)
+    
+        # 注册
+        time.sleep(1)
+        signup(URL, driver)
+        time.sleep(2)
+
+        # 选中单词（移动鼠标到起点位置、按下鼠标左键、拖动鼠标到结束位置、释放鼠标左键、执行操作链）
+        article = driver.find_element_by_id("article")
+        actions = ActionChains(driver)
+        actions.move_to_element(article).click_and_hold().move_by_offset(450,60).release().perform()
+        time.sleep(1)
+
+        # 判断所有高亮单词是否有间隔
+        highlighteds = driver.find_elements_by_class_name("highlighted")
+        for highlighted in highlighteds:
+            assert highlighted.value_of_css_property("padding") == '0px'
+        time.sleep(5)
+    finally:
+        # 测试结束后关闭浏览器
+        driver.quit()
+        
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