added test stage

stages:

- build  # section name of the CI pipeline

- test   # other section executed AFTER 'build'

build_job:

  stage: build   # section where to run the 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."

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