Update .gitlab-ci.yml

.gitlab-ci.yml

-image: python:latest
 
-cache:
-  paths:
-    - .cache/pip
-    - venv/
-
-before_script:
-  - pip install virtualenv
-  - virtualenv venv
-  - source venv/bin/activate
-  - python -m pip install -U matplotlib
+image: python:3.9
 
 stages:
-  - test
+  - Testing
 
-unit-test-job:
-  stage: test
+test:
+  stage: Testing
   script:
-    - echo "Running unit tests..."
-    - python3 -m unittest
-    - echo "All tests passed"
+    - python3.9 -m test pytest
+
+
+