ci: add cobertura coverage report

.gitlab-ci.yml

@@ -6,7 +6,7 @@ cache:
     - node_modules
 
 before_script:
-  - npm install
+  - npm ci
 
 stages:
   - build
@@ -27,9 +27,12 @@ test:
   stage: test
   script:
     - npm test
+  coverage: '/Statements[^:]*\:[^:]*\s+([\d\.]+)%/'
   artifacts:
-    paths:
-      - coverage
+    reports:
+      coverage_report:
+        coverage_format: cobertura
+        path: coverage/cobertura-coverage.xml
 
 audit:
   stage: test

package.json

@@ -17,7 +17,7 @@
     "prepublishOnly": "npm ci && npm run build",
     "preversion": "npm run prepublishOnly",
     "push": "git push && git push origin \"v$npm_package_version\"",
-    "test": "nyc mocha --require source-map-support/register --require ts-node/register 'test/**/*.spec.ts'",
+    "test": "nyc mocha 'test/**/*.spec.ts'",
     "lint": "eslint --ext .ts src/"
   },
   "author": "Karl-Philipp Wulfert <krlwlfrt@gmail.com>",
@@ -83,6 +83,7 @@
     "lines": 95,
     "per-file": true,
     "reporter": [
+      "cobertura",
       "html",
       "text-summary"
     ],