diff --git a/app/test/test_bug551_DingZeYu.py b/app/test/test_bug551_DingZeYu.py
index 799a562..2641373 100644
--- a/app/test/test_bug551_DingZeYu.py
+++ b/app/test/test_bug551_DingZeYu.py
@@ -1,26 +1,43 @@
-import time
-import pytest
-from selenium import webdriver
-from selenium.webdriver import ActionChains
-from selenium.webdriver.common.by import By
-
-
-def test_bug551():
-    driver = webdriver.Edge()
-    driver.maximize_window()
-    driver.get("http://127.0.0.1:5000/")
-
-    driver.find_element(By.CSS_SELECTOR, 'a[href="/login"]').click()
-    driver.find_element(By.CLASS_NAME, 'username').send_keys('dzy')
-    driver.find_element(By.CLASS_NAME, 'password').send_keys('123456')
-    driver.find_element(By.CLASS_NAME, 'btn').click()
-
-    article = driver.find_element(By.ID, 'article')
-    actions = ActionChains(driver)
-
-    actions.move_to_element(article)
-    actions.click_and_hold()
-    actions.move_by_offset(450, 200)
-    actions.release()
-    actions.perform()
-    time.sleep(5)
+import time
+import pytest
+from selenium import webdriver
+from selenium.webdriver import ActionChains
+from selenium.webdriver.common.by import By
+from selenium.webdriver.common.alert import Alert
+from selenium.webdriver.support import expected_conditions as EC
+from selenium.webdriver.support.wait import WebDriverWait
+
+
+def test_bug551():
+    driver = webdriver.Edge()
+    driver.maximize_window()
+    driver.get("http://127.0.0.1:5000/")
+
+    driver.find_element(By.CSS_SELECTOR, 'a[href="/login"]').click()
+    driver.find_element(By.ID, 'username').send_keys('dzy')
+    driver.find_element(By.ID, 'password').send_keys('123456')
+    driver.find_element(By.CLASS_NAME, 'btn').click()
+
+    try:
+        alert = WebDriverWait(driver, 10).until(EC.alert_is_present())
+        alert.accept()
+        driver.find_element(By.CSS_SELECTOR, 'a[href="/signup"]').click()
+        driver.find_element(By.ID, 'username').send_keys('dzy')
+        driver.find_element(By.ID, 'password').send_keys('123456')
+        driver.find_element(By.ID, 'password2').send_keys('123456')
+        driver.find_element(By.CLASS_NAME, 'btn').click()
+        alert = WebDriverWait(driver, 10).until(EC.alert_is_present())
+        alert.accept()
+
+    except:
+        pass
+
+    article = driver.find_element(By.ID, 'article')
+    actions = ActionChains(driver)
+
+    actions.move_to_element(article)
+    actions.click_and_hold()
+    actions.move_by_offset(450, 200)
+    actions.release()
+    actions.perform()
+    time.sleep(5)