V3RON · V3RON · Jan 10, 2026 · Jan 10, 2026 · Jan 10, 2026 · Jan 10, 2026
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -14,6 +14,17 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+env:
+  # Android emulator configuration
+  ANDROID_API_LEVEL: '35'
+  ANDROID_ARCH: 'x86_64'
+  ANDROID_PROFILE: 'pixel_6'
+  ANDROID_AVD_NAME: 'Pixel_8_API_35'
+  # iOS simulator configuration
+  IOS_DEVICE_MODEL: 'iPhone 17 Pro'
+  IOS_VERSION: '26.0'
+  XCODE_VERSION: '26.1.1'
+
 jobs:
   lint:
     runs-on: ubuntu-latest
@@ -44,7 +55,7 @@ jobs:
       - name: Build package
         run: yarn prepare
 
-  build-android:
+  harness-android:
     runs-on: ubuntu-latest
 
     env:
@@ -65,28 +76,43 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-turborepo-android-
 
-      - name: Check turborepo cache for Android
+      - name: Check turborepo cache status
         run: |
-          TURBO_CACHE_STATUS=$(node -p "($(yarn turbo run build:android --cache-dir="${{ env.TURBO_CACHE_DIR }}" --dry=json)).tasks.find(t => t.task === 'build:android').cache.status")
+          # Check if harness tests can be skipped entirely
+          HARNESS_CACHE_STATUS=$(node -p "($(yarn turbo run test:harness:android --cache-dir="${{ env.TURBO_CACHE_DIR }}" --dry=json)).tasks.find(t => t.task === 'test:harness:android').cache.status")
+          if [[ $HARNESS_CACHE_STATUS == "HIT" ]]; then
+            echo "harness_cache_hit=1" >> $GITHUB_ENV
+          fi
 
-          if [[ $TURBO_CACHE_STATUS == "HIT" ]]; then
-            echo "turbo_cache_hit=1" >> $GITHUB_ENV
+          # Check if native build can be skipped (to avoid installing JDK/Gradle)
+          BUILD_CACHE_STATUS=$(node -p "($(yarn turbo run build:android --cache-dir="${{ env.TURBO_CACHE_DIR }}" --dry=json)).tasks.find(t => t.task === 'build:android').cache.status")
+          if [[ $BUILD_CACHE_STATUS == "HIT" ]]; then
+            echo "build_cache_hit=1" >> $GITHUB_ENV
           fi
 
+      - name: Reclaim disk space
+        if: env.harness_cache_hit != 1
+        uses: AdityaGarg8/remove-unwanted-software@v5
+        with:
+          remove-dotnet: true
+          remove-haskell: true
+          remove-codeql: true
+          remove-docker-images: true
+
       - name: Install JDK
-        if: env.turbo_cache_hit != 1
+        if: env.harness_cache_hit != 1 && env.build_cache_hit != 1
         uses: actions/setup-java@c5195efecf7bdfc987ee8bae7a71cb8b11521c00 # v4.7.1
         with:
           distribution: 'zulu'
           java-version: '17'
 
       - name: Finalize Android SDK
-        if: env.turbo_cache_hit != 1
+        if: env.harness_cache_hit != 1 && env.build_cache_hit != 1
         run: |
           /bin/bash -c "yes | $ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager --licenses > /dev/null"
 
       - name: Cache Gradle
-        if: env.turbo_cache_hit != 1
+        if: env.harness_cache_hit != 1 && env.build_cache_hit != 1
         uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
         with:
           path: |
@@ -97,16 +123,64 @@ jobs:
             ${{ runner.os }}-gradle-
 
       - name: Build example for Android
+        if: env.harness_cache_hit != 1
         env:
           JAVA_OPTS: "-XX:MaxHeapSize=6g"
         run: |
           yarn turbo run build:android --cache-dir="${{ env.TURBO_CACHE_DIR }}"
 
-  build-ios:
+      - name: Enable KVM group perms
+        if: env.harness_cache_hit != 1
+        run: |
+          echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
+          sudo udevadm control --reload-rules
+          sudo udevadm trigger --name-match=kvm
+          ls /dev/kvm
+
+      - name: AVD cache
+        if: env.harness_cache_hit != 1
+        uses: actions/cache@5a3ec84eff668545956fd18022155c47e93e2684 # v4.2.3
+        id: avd-cache
+        with:
+          path: |
+            ~/.android/avd/*
+            ~/.android/adb*
+          key: avd-${{ env.ANDROID_API_LEVEL }}-${{ env.ANDROID_ARCH }}
+
+      - name: Create AVD and generate snapshot for caching
+        if: env.harness_cache_hit != 1 && steps.avd-cache.outputs.cache-hit != 'true'
+        uses: reactivecircus/android-emulator-runner@v2
+        with:
+          api-level: ${{ env.ANDROID_API_LEVEL }}
+          arch: ${{ env.ANDROID_ARCH }}
+          profile: ${{ env.ANDROID_PROFILE }}
+          disk-size: 1G
+          heap-size: 1G
+          force-avd-creation: false
+          avd-name: ${{ env.ANDROID_AVD_NAME }}
+          disable-animations: true
+          emulator-options: -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none
+          script: echo "Generated AVD snapshot for caching."
+
+      - name: Run Harness E2E tests
+        if: env.harness_cache_hit != 1
+        uses: reactivecircus/android-emulator-runner@v2
+        with:
+          working-directory: example
+          api-level: ${{ env.ANDROID_API_LEVEL }}
+          arch: ${{ env.ANDROID_ARCH }}
+          force-avd-creation: false
+          avd-name: ${{ env.ANDROID_AVD_NAME }}
+          disable-animations: true
+          emulator-options: -no-snapshot-save -no-window -gpu swiftshader_indirect -noaudio -no-boot-anim -camera-back none
+          script: |
+            adb install -r "./android/app/build/outputs/apk/debug/app-debug.apk"
+            yarn turbo run test:harness:android --cache-dir="${{ env.TURBO_CACHE_DIR }}"
+
+  harness-ios:
     runs-on: macos-latest
 
     env:
-      XCODE_VERSION: 16.3
       TURBO_CACHE_DIR: .turbo/ios
       RCT_USE_RN_DEP: 1
       RCT_USE_PREBUILT_RNCORE: 1
@@ -126,28 +200,55 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-turborepo-ios-
 
-      - name: Check turborepo cache for iOS
+      - name: Check turborepo cache status
         run: |
-          TURBO_CACHE_STATUS=$(node -p "($(yarn turbo run build:ios --cache-dir="${{ env.TURBO_CACHE_DIR }}" --dry=json)).tasks.find(t => t.task === 'build:ios').cache.status")
+          # Check if harness tests can be skipped entirely
+          HARNESS_CACHE_STATUS=$(node -p "($(yarn turbo run test:harness:ios --cache-dir="${{ env.TURBO_CACHE_DIR }}" --dry=json)).tasks.find(t => t.task === 'test:harness:ios').cache.status")
+          if [[ $HARNESS_CACHE_STATUS == "HIT" ]]; then
+            echo "harness_cache_hit=1" >> $GITHUB_ENV
+          fi
 
-          if [[ $TURBO_CACHE_STATUS == "HIT" ]]; then
-            echo "turbo_cache_hit=1" >> $GITHUB_ENV
+          # Check if native build can be skipped (to avoid installing Xcode/CocoaPods)
+          BUILD_CACHE_STATUS=$(node -p "($(yarn turbo run build:ios --cache-dir="${{ env.TURBO_CACHE_DIR }}" --dry=json)).tasks.find(t => t.task === 'build:ios').cache.status")
+          if [[ $BUILD_CACHE_STATUS == "HIT" ]]; then
+            echo "build_cache_hit=1" >> $GITHUB_ENV
           fi
 
       - name: Use appropriate Xcode version
-        if: env.turbo_cache_hit != 1
+        if: env.harness_cache_hit != 1 && env.build_cache_hit != 1
         uses: maxim-lobanov/setup-xcode@60606e260d2fc5762a71e64e74b2174e8ea3c8bd # v1.6.0
         with:
           xcode-version: ${{ env.XCODE_VERSION }}
 
       - name: Install cocoapods
-        if: env.turbo_cache_hit != 1 && steps.cocoapods-cache.outputs.cache-hit != 'true'
+        if: env.harness_cache_hit != 1 && env.build_cache_hit != 1
         run: |
           cd example
           bundle install
           bundle exec pod repo update --verbose
           bundle exec pod install --project-directory=ios
 
       - name: Build example for iOS
+        if: env.harness_cache_hit != 1
         run: |
           yarn turbo run build:ios --cache-dir="${{ env.TURBO_CACHE_DIR }}"
+
+      - name: Setup iOS Simulator
+        if: env.harness_cache_hit != 1
+        uses: futureware-tech/simulator-action@v4
+        with:
+          model: ${{ env.IOS_DEVICE_MODEL }}
+          os: iOS
+          os_version: ${{ env.IOS_VERSION }}
+          wait_for_boot: true
+          erase_before_boot: false
+
+      - name: Install app on simulator
+        if: env.harness_cache_hit != 1
+        run: |
+          xcrun simctl install booted example/ios/build/Build/Products/Debug-iphonesimulator/WebworkerExample.app
+
+      - name: Run Harness E2E tests
+        if: env.harness_cache_hit != 1
+        run: |
+          yarn turbo run test:harness:ios --cache-dir="${{ env.TURBO_CACHE_DIR }}"
diff --git a/example/package.json b/example/package.json
@@ -6,8 +6,8 @@
     "android": "react-native run-android",
     "ios": "react-native run-ios",
     "start": "react-native start",
-    "build:android": "react-native build-android --extra-params \"--no-daemon --console=plain -PreactNativeArchitectures=arm64-v8a\"",
-    "build:ios": "react-native build-ios --mode Debug",
+    "build:android": "react-native build-android --tasks assembleDebug --extra-params \"--no-daemon --console=plain -PreactNativeArchitectures=x86_64\"",
+    "build:ios": "react-native build-ios --mode Debug --buildFolder build",
     "test:harness:ios": "react-native-harness --harnessRunner ios",
     "test:harness:android": "react-native-harness --harnessRunner android"
   },

diff --git a/example/rn-harness.config.mjs b/example/rn-harness.config.mjs
@@ -14,7 +14,7 @@ const config = {
   runners: [
     androidPlatform({
       name: 'android',
-      device: androidEmulator('Pixel_8_API_33', {
+      device: androidEmulator('Pixel_8_API_35', {
         apiLevel: 35,
         profile: 'pixel_6',
         diskSize: '1G',
@@ -24,7 +24,7 @@ const config = {
     }),
     applePlatform({
       name: 'ios',
-      device: appleSimulator('iPhone 16 Pro', '26.0'),
+      device: appleSimulator('iPhone 17 Pro', '26.0'),
       bundleId: 'webworker.example',
     }),
   ],

diff --git a/turbo.json b/turbo.json
@@ -7,17 +7,16 @@
       "env": ["ANDROID_HOME", "ORG_GRADLE_PROJECT_newArchEnabled"],
       "inputs": [
         "package.json",
+        "cpp",
         "android",
         "!android/build",
-        "src/*.ts",
-        "src/*.tsx",
         "example/package.json",
         "example/android",
         "!example/android/.gradle",
         "!example/android/build",
         "!example/android/app/build"
       ],
-      "outputs": []
+      "outputs": ["example/android/app/build/outputs/apk/debug/app-debug.apk"]
     },
     "build:ios": {
       "env": [
@@ -28,11 +27,47 @@
       ],
       "inputs": [
         "package.json",
+        "cpp",
+        "*.podspec",
+        "ios",
+        "example/package.json",
+        "example/ios",
+        "!example/ios/build",
+        "!example/ios/Pods"
+      ],
+      "outputs": [
+        "example/ios/build/Build/Products/Debug-iphonesimulator/WebworkerExample.app/**"
+      ]
+    },
+    "test:harness:android": {
+      "dependsOn": ["build:android"],
+      "inputs": [
+        "package.json",
+        "cpp",
+        "android",
+        "!android/build",
+        "src/*.ts",
+        "src/*.tsx",
+        "example/package.json",
+        "example/src",
+        "example/android",
+        "!example/android/.gradle",
+        "!example/android/build",
+        "!example/android/app/build"
+      ],
+      "outputs": []
+    },
+    "test:harness:ios": {
+      "dependsOn": ["build:ios"],
+      "inputs": [
+        "package.json",
+        "cpp",
         "*.podspec",
         "ios",
         "src/*.ts",
         "src/*.tsx",
         "example/package.json",
+        "example/src",
         "example/ios",
         "!example/ios/build",
         "!example/ios/Pods"