feat: add code coverage

.github/workflows/coverage.yaml

@@ -0,0 +1,51 @@
+name: Java Code Coverage
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches: [ '*' ]
+
+jobs:
+  coverage:
+    name: Generate Coverage Report
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Install buf
+      run: |
+        curl -sSL "https://github.com/bufbuild/buf/releases/latest/download/buf-$(uname -s)-$(uname -m)" -o /usr/local/bin/buf
+        chmod +x /usr/local/bin/buf
+
+    - name: Set up JDK 11
+      uses: actions/setup-java@v4
+      with:
+            distribution: 'temurin'
+            java-version: '11'
+
+    - name: Build with Maven
+      run: mvn -B clean package
+
+    - name: Run tests
+      run: mvn test
+
+    - name: Generate Jacoco coverage report
+      run: mvn jacoco:report
+
+    - name: show files
+      run: |
+         ls
+         pwd
+    - name: Upload coverage report
+      uses: actions/upload-artifact@v4
+      with:
+        name: coverage-report
+        path: |
+          ${{ github.workspace }}/target/site/jacoco/jacoco.xml
+          ${{ github.workspace }}/target/site/jacoco/index.html
+
+

pom.xml

@@ -168,6 +168,31 @@
                         </rules>
                     </configuration>
                 </plugin>
+                <plugin>
+                    <groupId>org.jacoco</groupId>
+                    <artifactId>jacoco-maven-plugin</artifactId>
+                    <version>0.8.8</version>
+                    <executions>
+                        <execution>
+                            <goals>
+                                <goal>prepare-agent</goal>
+                            </goals>
+                        </execution>
+                        <execution>
+                            <id>report</id>
+                            <phase>test</phase>
+                            <goals>
+                                <goal>report</goal>
+                            </goals>
+                            <configuration>
+                                <outputDirectory>${project.build.directory}/site/jacoco</outputDirectory>
+                                <formats>
+                                    <format>xml</format>
+                                </formats>
+                            </configuration>
+                        </execution>
+                    </executions>
+                </plugin>
             </plugins>
         </pluginManagement>
         <plugins>