diff --git a/tests/api_server.py b/tests/api_server.py
index 4cf6b0fb..6919b274 100644
--- a/tests/api_server.py
+++ b/tests/api_server.py
@@ -93,6 +93,7 @@ def validate_request(func):
 def index():
     return "Hello World!"
 
+
 @app.route('/api/get-token', methods=['POST'])
 def get_token():
     device_sn = request.headers.get('device_sn', "")
@@ -121,6 +122,7 @@ def get_token():
     response.headers["Content-Type"] = "application/json"
     return response
 
+
 @app.route('/api/users')
 @validate_request
 def get_users():
@@ -134,6 +136,7 @@ def get_users():
     response.headers["Content-Type"] = "application/json"
     return response
 
+
 @app.route('/api/reset-all')
 @validate_request
 def clear_users():
@@ -145,6 +148,7 @@ def clear_users():
     response.headers["Content-Type"] = "application/json"
     return response
 
+
 @app.route('/api/users/<int:uid>', methods=['POST'])
 @validate_request
 def create_user(uid):
@@ -167,6 +171,7 @@ def create_user(uid):
     response.headers["Content-Type"] = "application/json"
     return response
 
+
 @app.route('/api/users/<int:uid>')
 @validate_request
 def get_user(uid):
@@ -188,6 +193,7 @@ def get_user(uid):
     response.headers["Content-Type"] = "application/json"
     return response
 
+
 @app.route('/api/users/<int:uid>', methods=['PUT'])
 @validate_request
 def update_user(uid):
@@ -209,6 +215,7 @@ def update_user(uid):
     response.headers["Content-Type"] = "application/json"
     return response
 
+
 @app.route('/api/users/<int:uid>', methods=['DELETE'])
 @validate_request
 def delete_user(uid):
diff --git a/tests/base.py b/tests/base.py
index 9e1e09b2..86da90fb 100644
--- a/tests/base.py
+++ b/tests/base.py
@@ -33,7 +33,7 @@ class ApiServerUnittest(unittest.TestCase):
         )
         cls.flask_process.start()
         cls.httpbin_process.start()
-        time.sleep(0.1)
+        time.sleep(1)
         cls.api_client = requests.Session()
 
     @classmethod