Patnala issue 5 automated testing

.gitlab-ci.yml

 stages:        
   - info
+  - test
 
 infojob:
- stage: info
- tags:
- - linux
- script:
-   - uname -a
-   - cat /etc/*release
-   - rpm -qa
+  stage: info
+  tags:
+    - linux
+  script:
+    - uname -a
+    - cat /etc/*release
+    - rpm -qa
+
+  
+tests:
+  stage: test
+  image: registry.jsc.fz-juelich.de/sharedrunner/opensuse-latex
+  tags:
+    - linux
+  before_script:
+    - python3 -m venv venv
+    - . venv/bin/activate
+    - pip install -r requirements.txt
+  script:
+    - pytest -v --cov=calculator