ci: generate code coverage report

.gitlab-ci.yml

@@ -14,8 +14,11 @@ before_script:
   - export PATH="$PATH":"~/.pub-cache/bin"
   - pub get --no-precompile
   - pub global activate junitreport
-  - pub global activate junitreport
+  - pub global activate coverage
   - pub global activate -sgit https://github.com/Workiva/lsif_indexer
+  - apt -qq update
+  - apt -qq install -y python3 python3-distutils # unfortunately necessary to convert lcov reports to cobertura
+  - curl -o lcov_cobertura.py https://raw.githubusercontent.com/eriwen/lcov-to-cobertura-xml/master/lcov_cobertura/lcov_cobertura.py
 
 style_check:
   stage: test
@@ -30,13 +33,17 @@ lint:
 test:
   stage: test
   script:
-    - pub run test $PUB_VARS > report.jsonl
+    - pub run test $PUB_VARS --coverage=./coverage > report.jsonl
     - pub global run junitreport:tojunit --input report.jsonl --output report.xml
+    - pub global run coverage:format_coverage --packages=.packages --report-on=lib --lcov -o ./coverage/lcov.info -i ./coverage
+    - python3 lcov_cobertura.py ./coverage/test/* -o ./coverage.xml
   artifacts:
     when: always
     reports:
       junit:
         - report.xml
+      cobertura:
+        - coverage.xml
 
 code_quality:
   stage: test