CI: add tests

.gitlab-ci.yml

 # vim: ts=2
 
+stages:
+  - testing
+  - release
+
+run-tests:
+  stage: testing
+  script:
+    - pip install --upgrade pip pipenv
+    - pipenv install -d
+    - pipenv run ./run-tests.sh
+  coverage: /TOTAL.*? (100(?:\.0+)?\%|[1-9]?\d(?:\.\d+)?\%)$/
+
 sonarqube-check:
+  stage: testing
   variables:
-    SONAR_USER_HOME: "${CI_PROJECT_DIR}/.sonar"  # Defines the location of the analysis task cache
-    GIT_DEPTH: "0"  # Tells git to fetch all the branches of the project, required by the analysis task
+    SONAR_USER_HOME: "${CI_PROJECT_DIR}/.sonar" # Defines the location of the analysis task cache
+    GIT_DEPTH: "0" # Tells git to fetch all the branches of the project, required by the analysis task
   cache:
     key: "${CI_JOB_NAME}"
     paths:
@@ -16,6 +29,9 @@ sonarqube-check:
     - merge_requests
 
 pypi-release:
+  stage: release
+  needs:
+    - run-tests
   rules:
     - if: '$CI_COMMIT_TAG =~ /^v\d+/'
   script: