Merge pull request 'ci: add code coverage integration' (#69) from ci-coverage-integration into main

Reviewed-on: #69

.gitea/workflows/ci.yaml

@@ -17,6 +17,61 @@ jobs:
       - name: Run tests
         run: go test -race -coverprofile=coverage.txt ./...
 
+      - name: Check coverage
+        uses: vladopajic/go-test-coverage@v2
+        with:
+          config: ./.testcoverage.yml
+
+      # Download baseline coverage from main branch (for PRs)
+      - name: Download baseline coverage
+        if: gitea.event_name == 'pull_request'
+        uses: actions/download-artifact@v3
+        with:
+          name: coverage-baseline
+          path: ./baseline
+        continue-on-error: true
+
+      # Compare coverage against baseline (for PRs)
+      - name: Compare coverage
+        if: gitea.event_name == 'pull_request'
+        run: |
+          CURRENT=$(go tool cover -func=coverage.txt | grep "^total:" | awk '{print $NF}' | tr -d '%')
+          if [ -f ./baseline/coverage.txt ]; then
+            BASE=$(go tool cover -func=./baseline/coverage.txt | grep "^total:" | awk '{print $NF}' | tr -d '%')
+            echo "Base coverage: ${BASE}%"
+            echo "Current coverage: ${CURRENT}%"
+            if [ "$(echo "$CURRENT < $BASE" | bc -l)" -eq 1 ]; then
+              echo "::error::Coverage decreased from ${BASE}% to ${CURRENT}%"
+              exit 1
+            fi
+            echo "Coverage maintained or improved: ${BASE}% -> ${CURRENT}%"
+          else
+            echo "No baseline coverage found, skipping comparison"
+            echo "Current coverage: ${CURRENT}%"
+          fi
+
+      # Upload coverage as baseline (only on main)
+      - name: Upload coverage baseline
+        if: gitea.ref == 'refs/heads/main'
+        uses: actions/upload-artifact@v3
+        with:
+          name: coverage-baseline
+          path: coverage.txt
+          retention-days: 90
+
+      # Post coverage to PR comment
+      - name: Post coverage comment
+        if: gitea.event_name == 'pull_request'
+        env:
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+          GITEA_URL: ${{ gitea.server_url }}
+        run: |
+          COVERAGE=$(go tool cover -func=coverage.txt | grep "^total:" | awk '{print $NF}')
+          curl -X POST "${GITEA_URL}/api/v1/repos/${{ gitea.repository }}/issues/${{ gitea.event.pull_request.number }}/comments" \
+            -H "Authorization: token ${GITEA_TOKEN}" \
+            -H "Content-Type: application/json" \
+            -d "{\"body\": \"## Coverage Report\n\nTotal coverage: **${COVERAGE}**\"}"
+
   vulnerabilities:
     runs-on: ubuntu-latest
     steps:

.testcoverage.yml

@@ -0,0 +1,13 @@
+# Coverage configuration for go-test-coverage
+# https://github.com/vladopajic/go-test-coverage
+
+profile: coverage.txt
+
+threshold:
+  file: 0
+  package: 0
+  total: 0
+
+exclude:
+  paths:
+    - _test\.go$