Robolectric and SystemUI, is it possible?

[Thomas Kuhnke]

We want to write tests with the Robolectric Runner for our SystemUI Overlay, but we're facing multiple issues with that. 

first issue: preshipped robolectric versions are not compatible with API Level 32

 our build is based on Android 12.1.0_r5, which leads to the first issue. We needed to create a new prebuild version of robolectric 4.8.1 in our aosp setup under `prebuilts/misc/common/robolectric/` to get robolectric working with API Level 32. 

After messing a bit with the generated blueprint from the `prebuilts/misc/common/robolectric/update-script` we have a working module.

second issue: `prebuilts/misc/common/robolectric/android-all` is missing android 12.1 depencies

- adding dependencies manually and starting the copySdks task from the update.gradle did the job

BUT: I needed to change the name from android-all-12.1-robolectric-8229987.jar to android-all-instrumented-12.1-robolectric-8229987-i4.jar, otherwise the compilation of my tests failed to find the dependency. But this seems to work as a temporary workaround

third issue:  java.lang.NoSuchMethodException: com.android.systemui.xxx.<init>()

We created a robotests project inside our overidden SystemUI with following structure

robotests

  src

    com.android.systemui.car.systembar

      CarControlCenterControllerTest
  Android.bp

blueprint file looks like following:

android_robolectric_test {
    name: "MyCustomSystemUIRobolectricTests",
    srcs: ["src/**/*.java"],

    static_libs: [
    "android-support-annotations",
    "androidx.test.core",
    "androidx.test.runner",
    "androidx.test.ext.junit",
    "androidx.test.espresso.core",
    ],

    robolectric_prebuilt_version: "4.8.1",

    java_resource_dirs: ["config", "resources"],
    instrumentation_for: "MyCustomSystemUI",
    test_options: {
        timeout: 36000,
        shards: 10,
    },
}

Executing tests with `make RunMyCustomSystemUIRobolectricTests` leads to the issue, that nearly every class from the original SystemUI cannot be instantiated by the ReflectionHelper from Robolectric due to the missing Default Contructor. 

RunMyCustomSystemUIRobolectricTests0: 2) defaultSucceed(com.android.systemui.car.systembar.CarControlCenterControllerTest)

RunMyCustomSystemUIRobolectricTests0: java.lang.RuntimeException: java.lang.NoSuchMethodException: com.android.systemui.people.widget.PeopleSpaceWidgetPinnedReceiver.<init>()

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.util.ReflectionHelpers.callConstructor(ReflectionHelpers.java:434)

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.internal.bytecode.ShadowImpl.newInstanceOf(ShadowImpl.java:18)

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.shadow.api.Shadow.newInstanceOf(Shadow.java:35)

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.android.internal.AndroidTestEnvironment.registerBroadcastReceivers(AndroidTestEnvironment.java:675)

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.android.internal.AndroidTestEnvironment.installAndCreateApplication(AndroidTestEnvironment.java:339)

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.android.internal.AndroidTestEnvironment.lambda$createApplicationSupplier$0(AndroidTestEnvironment.java:229)

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.util.PerfStatsCollector.measure(PerfStatsCollector.java:53)

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.android.internal.AndroidTestEnvironment.lambda$createApplicationSupplier$1(AndroidTestEnvironment.java:226)

RunMyCustomSystemUIRobolectricTests0:    at com.google.common.base.Suppliers$NonSerializableMemoizingSupplier.get(Suppliers.java:167)

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.RuntimeEnvironment.getApplication(RuntimeEnvironment.java:71)

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.android.internal.AndroidTestEnvironment.setUpApplicationState(AndroidTestEnvironment.java:194)

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.RobolectricTestRunner.beforeTest(RobolectricTestRunner.java:325)

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.internal.SandboxTestRunner$2.lambda$evaluate$0(SandboxTestRunner.java:265)

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.internal.bytecode.Sandbox.lambda$runOnMainThread$0(Sandbox.java:88)

RunMyCustomSystemUIRobolectricTests0:    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)

RunMyCustomSystemUIRobolectricTests0:    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)

RunMyCustomSystemUIRobolectricTests0:    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)

RunMyCustomSystemUIRobolectricTests0:    at java.base/java.lang.Thread.run(Thread.java:844)

RunMyCustomSystemUIRobolectricTests0: Caused by: java.lang.NoSuchMethodException: com.android.systemui.people.widget.PeopleSpaceWidgetPinnedReceiver.<init>()

RunMyCustomSystemUIRobolectricTests0:    at java.base/java.lang.Class.getConstructor0(Class.java:3322)

RunMyCustomSystemUIRobolectricTests0:    at java.base/java.lang.Class.getDeclaredConstructor(Class.java:2510)

RunMyCustomSystemUIRobolectricTests0:    at org.robolectric.util.ReflectionHelpers.callConstructor(ReflectionHelpers.java:420)

RunMyCustomSystemUIRobolectricTests0:  

I tried creating some of the Shadow Classes by myself with just an empty class, but this seems not to be the right way, as I would need to create hundreds more of them.

Does anybody have any Idea or different approach to get Robolectric and SystemUI together?

thanks in advance