added test stage

.gitlab-ci.yml

 stages:
 - build  # section name of the CI pipeline
+- test   # other section executed AFTER 'build'
 
 build_job:
   stage: build   # section where to run the job
@@ -9,3 +10,21 @@ build_job:
     - echo "Building the application..."
     - python -m py_compile program.py
     - echo "Building complete."
+
+test_job_1:
+  stage: test  # section where to run the job
+  tags:
+    - git-run-ia2  # who is running the job
+  script:
+    - echo "Running test group 1 ..."
+    - python test_program.py
+    - echo "Testing complete."
+
+test_job_2:
+  stage: test  # section where to run the job
+  tags:
+    - git-run-ia2  # who is running the job
+  script:
+    - echo "Running more tests in group 2..."
+    - sleep 5
+    - echo "Testing complete."
\ No newline at end of file