Update test_app.py

test_app.py

@@ -1,10 +1,8 @@
-from flask import Flask
+from app import app
 
-app = Flask(__name__)
+def test_homepage():
     
-@app.route('/')
-def hello_world():
-    return 'Hello, Worlddddddddddd!!!'
-
-if __name__ == '__main__':
-    app.run(debug=True)
+    with app.test_client() as client:
+        response = client.get('/')   
+        assert response.status_code == 200  
+        assert b"Hello, Worlddddddddddd!!!" in response.data