dcache-cta: visualize test coverage

dcache-cta-build.yaml

+stages:
+  - build
+  - visualize
+
 variables:
   MAVEN_CLI_OPTS: "--batch-mode --errors --fail-at-end --show-version -DinstallAtEnd=true -DdeployAtEnd=true"
   REPO_NAME: nfs4j
 
-image: maven:3.6.3-openjdk-11
-
 # Cache downloaded dependencies and plugins between builds.
 # To keep cache across branches add 'key: "$CI_JOB_NAME"'
 cache:
@@ -16,8 +18,9 @@ cache:
 
 build:
   stage: build
+  image: maven:3.6.3-openjdk-11
   script:
-    - mvn $MAVEN_CLI_OPTS clean package
+    - mvn $MAVEN_CLI_OPTS clean org.jacoco:jacoco-maven-plugin:prepare-agent package jacoco:report
 
   artifacts:
     reports:
@@ -26,3 +29,17 @@ build:
         - "**/target/failsafe-reports/TEST-*.xml"
     paths:
       - "**/target/dcache-cta*.tar.gz"
+
+coverage-jdk11:
+  # Must be in a stage later than test-jdk11's stage.
+  # The `visualize` stage does not exist by default.
+  # Please define it first, or choose an existing stage like `deploy`.
+  stage: visualize
+  image: registry.gitlab.com/haynes/jacoco2cobertura:1.0.7
+  script:
+    # convert report from jacoco to cobertura, using relative project path
+    - python /opt/cover2cover.py target/site/jacoco/jacoco.xml $CI_PROJECT_DIR/src/main/java/ > target/site/cobertura.xml
+  needs: ["build"]
+  artifacts:
+    reports:
+      cobertura: target/site/cobertura.xml
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