Update tests/test_router.py, .gitlab-ci.yml

.gitlab-ci.yml

-build: 
-    image: alpine
-    script: 
-        - echo "Hello" > index.html 
-    artifacts:
-        paths:
-            - index-.html
+run_tests:
+    stage: test
+    image: python:3.9
+    before_script:
+        - pip install -r requirements.txt
+    script:
+        - python -m unittest discover tests 

tests/router.py → tests/test_router.py

 
 import unittest
 
-from my_sum import sum
-
 
 class TestSum(unittest.TestCase):
     def test_list_int(self):