diff --git a/.github/workflows/build-release.yml b/.github/workflows/build-release.yml
index 68b89a56..5736cf87 100644
--- a/.github/workflows/build-release.yml
+++ b/.github/workflows/build-release.yml
@@ -13,8 +13,8 @@ permissions:
 
 jobs:
   test:
-    name: Unit tests (PR only)
-    if: github.event_name == 'pull_request'
+    name: Unit tests & coverage
+    if: github.event_name == 'pull_request' || (github.event_name == 'push' && github.ref == 'refs/heads/main')
     runs-on: ubuntu-latest
 
     steps:
@@ -44,19 +44,32 @@ jobs:
         working-directory: ft8cn
         run: ./gradlew testDebugUnitTest --stacktrace
 
+      - name: Generate coverage report
+        working-directory: ft8cn
+        run: ./gradlew jacocoTestReport --stacktrace
+
+      - name: Upload coverage to Codecov
+        continue-on-error: true
+        id: codecov
+        uses: codecov/codecov-action@v6
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ft8cn/app/build/reports/jacoco/jacocoTestReport/jacocoTestReport.xml
+
       - name: Upload test reports on failure
-        if: failure()
-        uses: actions/upload-artifact@v4
+        if: steps.codecov.outcome == 'failure'
+        uses: actions/upload-artifact@v7
         with:
           name: unit-test-reports
           path: |
             ft8cn/app/build/reports/tests/
             ft8cn/app/build/test-results/
+            ft8cn/app/build/reports/jacoco/
 
   build:
     name: Build APK
     needs: test
-    # Run when tests pass (PR), or when tests were skipped (push to main/dev/tags).
+    # Run when tests pass (PR/main push), or when tests were skipped (push to main/dev/tags).
     # Block only on actual test failure or cancellation.
     if: ${{ always() && needs.test.result != 'failure' && needs.test.result != 'cancelled' }}
     runs-on: ubuntu-latest
@@ -185,14 +198,14 @@ jobs:
           mv "$src" "FT8CN-${{ steps.tag.outputs.release_tag }}.apk"
 
       - name: Upload APK artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: ft8cn-release
           path: ft8cn/app/build/outputs/apk/release/*.apk
 
       - name: Upload AAB artifact
         if: steps.tag.outputs.should_release == 'true'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: ft8cn-release-aab
           path: ft8cn/app/build/outputs/bundle/release/*.aab
diff --git a/ft8cn/app/build.gradle b/ft8cn/app/build.gradle
index af9c80af..d6d1f736 100644
--- a/ft8cn/app/build.gradle
+++ b/ft8cn/app/build.gradle
@@ -4,6 +4,7 @@ import java.text.SimpleDateFormat
 plugins {
     id 'com.android.application'
     id 'org.jetbrains.kotlin.android'
+    id 'jacoco'
 }
 
 def currentTime = getCurrentTime()
@@ -197,3 +198,42 @@ dependencies {
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
     androidTestImplementation 'androidx.compose.ui:ui-test-junit4'
 }
+
+jacoco {
+    toolVersion = '0.8.12'
+}
+
+tasks.register('jacocoTestReport', JacocoReport) {
+    dependsOn 'testDebugUnitTest'
+
+    reports {
+        xml.required = true
+        html.required = true
+        csv.required = false
+    }
+
+    def excludes = [
+            '**/R.class',
+            '**/R$*.class',
+            '**/BuildConfig.*',
+            '**/Manifest*.*',
+            '**/*Test*.*',
+            '**/*$ViewBinder*.*',
+            '**/*$ViewInjector*.*',
+            '**/*Binding.*',
+            '**/*BindingImpl.*',
+            '**/DataBinderMapperImpl.*',
+            '**/BR.*',
+            '**/*ComposableSingletons*.*'
+    ]
+
+    classDirectories.setFrom(files(
+            fileTree(dir: "$buildDir/intermediates/javac/debug/classes", excludes: excludes),
+            fileTree(dir: "$buildDir/tmp/kotlin-classes/debug", excludes: excludes)
+    ))
+    sourceDirectories.setFrom(files('src/main/java', 'src/main/kotlin'))
+    executionData.setFrom(fileTree(dir: "$buildDir", includes: [
+            'jacoco/testDebugUnitTest.exec',
+            'outputs/unit_test_code_coverage/debugUnitTest/testDebugUnitTest.exec'
+    ]))
+}