run instrumented tests after build.

I still have no idea why it started working locally on my machine, but
so far we should enable it on CI builds and see if it works.

related issue: #85

.github/workflows/actions.yml

@@ -27,13 +27,22 @@ jobs:
       with:
         path: /usr/local/lib/android/sdk/ndk/21.3.6528147
         key: ndk_r21d_linux
+    - name: cache AVD
+      uses: actions/cache@v2
+      env:
+        cache-name: cache-avd
+      with:
+        path: /home/runner/.android/gradle/avd
+        key: gradle-avd
     - name: apt install
       run: |
         echo y | sudo apt-get install doxygen libxml2-dev libgrpc++-dev libgrpc-dev libprotobuf-dev protobuf-compiler protobuf-compiler-grpc graphviz cmake ninja-build
     - name: stupid NDK setup workaround for GitHub Actions
       run: sudo mkdir -p /usr/local/lib/android/sdk/ndk && sudo chmod 777 /usr/local/lib/android/sdk/ndk
     - name: build
       run: make
+    - name: run instrumented tests
+      run: cd java && ./gradlew testDevice1DebugAndroidTest
     - name: upload artifact
       if: success()
       uses: actions/upload-artifact@v2

java/androidaudioplugin/build.gradle.kts

@@ -73,8 +73,9 @@ android {
     }
     */
 
-    // I leave these settings here for possible use in the future (because this existence is harmless,
-    //  but note that it never worked for me: https://github.com/atsushieno/android-audio-plugin-framework/issues/85
+    // FIXME: it is annoying to copy this everywhere, but build.gradle.kts is incapable of importing this fragment...
+    // It's been long time until I got this working, and I have no idea why it started working.
+    //  If you don't get this working, you are not alone: https://github.com/atsushieno/android-audio-plugin-framework/issues/85
     testOptions {
         devices {
             this.register<com.android.build.api.dsl.ManagedVirtualDevice>("testDevice1") {

java/androidaudioplugin/src/androidTest/java/org/androidaudioplugin/NativeTest.kt

@@ -0,0 +1,14 @@
+
+package org.androidaudioplugin
+
+import org.junit.Assert.assertTrue
+import org.junit.Test
+
+class NativeTest {
+    @Test
+    fun test1() {
+        // FIXME: implement actual tests here.
+        assertTrue("test", true)
+    }
+}
+

java/samples/aaphostsample/build.gradle.kts

@@ -39,6 +39,20 @@ android {
     aaptOptions {
         noCompress ("sample.wav")
     }
+
+    // FIXME: it is annoying to copy this everywhere, but build.gradle.kts is incapable of importing this fragment...
+    // It's been long time until I got this working, and I have no idea why it started working.
+    //  If you don't get this working, you are not alone: https://github.com/atsushieno/android-audio-plugin-framework/issues/85
+    testOptions {
+        devices {
+            this.register<com.android.build.api.dsl.ManagedVirtualDevice>("testDevice1") {
+                device = "Pixel 5"
+                apiLevel = 30
+                systemImageSource = "google"
+                abi = "x86"
+            }
+        }
+    }
 }
 
 dependencies {