Fix coverage by merging coverage reports by different test jobs

#9

.gitlab-ci.yml

@@ -53,14 +53,12 @@ integration-test-job:   # This job runs in the test stage.
     - alembic downgrade base
     - alembic upgrade head
     - pytest --junitxml=integration-report.xml --cov=app --cov-report=term-missing app/tests/crud
-    - cd ..
-    - coverage xml --data-file=$BASE_DIR/.coverage -o integration-coverage.xml -q
-  coverage: '/(?i)total.*? (100(?:\.0+)?\%|[1-9]?\d(?:\.\d+)?\%)$/'
+    - mkdir coverage-integration
+    - mv .coverage coverage-integration
   artifacts:
+    paths:
+      - $BASE_DIR/coverage-integration/.coverage
     reports:
-      coverage_report:
-        coverage_format: cobertura
-        path: $CI_PROJECT_DIR/integration-coverage.xml
       junit: $BASE_DIR/integration-report.xml
 
 e2e-test-job:   # This job runs in the test stage.
@@ -83,15 +81,32 @@ e2e-test-job:   # This job runs in the test stage.
     - alembic downgrade base
     - alembic upgrade head
     - pytest --junitxml=e2e-report.xml --cov=app --cov-report=term-missing app/tests/api
+    - mkdir coverage-e2e
+    - mv .coverage coverage-e2e
+  artifacts:
+    paths:
+      - $BASE_DIR/coverage-e2e/.coverage
+    reports:
+      junit: $BASE_DIR/e2e-report.xml
+
+combine-test-coverage-job:   # Combine coverage reports from different test jobs
+  stage: test
+  needs:
+    - job: "e2e-test-job"
+      artifacts: true
+    - job: "integration-test-job"
+      artifacts: true
+  script:
+    - coverage combine coverage-e2e/.coverage coverage-integration/.coverage
+    - coverage report
     - cd ..
-    - coverage xml --data-file=$BASE_DIR/.coverage -o e2e-coverage.xml -q
+    - coverage xml --data-file=$BASE_DIR/.coverage -o coverage.xml
   coverage: '/(?i)total.*? (100(?:\.0+)?\%|[1-9]?\d(?:\.\d+)?\%)$/'
   artifacts:
     reports:
       coverage_report:
         coverage_format: cobertura
-        path: $CI_PROJECT_DIR/e2e-coverage.xml
-      junit: $BASE_DIR/e2e-report.xml
+        path: $CI_PROJECT_DIR/coverage.xml
 
 lint-test-job:   # This job also runs in the test stage.
   stage: test    # It can run at the same time as unit-test-job (in parallel).