only report on lib and test dirs.

.github/workflows/dart.yml

@@ -40,3 +40,4 @@ jobs:
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           path-to-lcov: coverage/lcov.info
+          base-path: .

_tool/test-coverage.sh

@@ -25,7 +25,7 @@ echo "fail=$fail"
 # shellcheck disable=SC2046
 jq -s '{coverage: [.[].coverage] | flatten}' $(find coverage -name '*.json' | xargs) > coverage/merged_json.cov
 
-pub global run coverage:format_coverage --packages=.packages -i coverage/merged_json.cov -l > coverage/lcov.info
+pub global run coverage:format_coverage --packages=.packages -i coverage/merged_json.cov -l --report-on lib --report-on test > coverage/lcov.info
 
 bash <(curl -s https://codecov.io/bash) -f coverage/lcov.info