Repository: flutter
Issue: Run Unit Test error when intergrate Flutter module in Android Project
Labels: c: crash,platform-android,engine,a: existing-apps,has reproducible steps,P2,team-android,triaged-android,found in release: 3.13,found in release: 3.14

### Is there an existing issue for this?

- [X] I have searched the [existing issues](https://github.com/flutter/flutter/issues)
- [X] I have read the [guide to filing a bug](https://flutter.dev/docs/resources/bug-reports)

### Steps to reproduce

1. Create a module flutter: ``` flutter create -t module --org com.example app_flutter```
2. Add Flutter module into Android project
3. Create a customize file FlutterActivity. MyFlutterActivity 
``` 

class MyFlutterActivity : FlutterActivity() {
    override fun onResume() {
        super.onResume()
        MethodChannel(flutterEngine!!.dartExecutor.binaryMessenger, "com.app.flutter.integrate")
            .invokeMethod("navigate_page", intent.getStringExtra("screen"))
    }



    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
        super.configureFlutterEngine(flutterEngine)
        flutterEngine.dartExecutor
            .executeDartEntrypoint(
                DartEntrypoint(
                    FlutterInjector.instance().flutterLoader().findAppBundlePath(),
                    "main"
                )
            )
        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, "com.app.flutter.integrate")
            .setMethodCallHandler { call, result ->
                when (call.method) {
                    "back" -> {
                        finish()
                    }
                    "getParams" -> {
                        val param = intent.getStringExtra("param")
                        result.success(param)
                    }
                }
            }
    }

    override fun provideFlutterEngine(context: Context): FlutterEngine? {
        return FlutterEngineCache.getInstance().get(FLUTTER_ENGINE_ID)
    }

    fun sum(a: Int,b: Int) : Int{
        return a + b;
    }
}
```
4. Create file unit test using Robolectric 
Add library into file app/build.grade 
``` 
testImplementation 'org.robolectric:robolectric:4.5.1'
    testImplementation 'org.robolectric:multidex:3.4.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
    testImplementation('com.squareup.assertj:assertj-android:1.2.0') {
        exclude group: "com.android.support", module: "support-annotations"
    }
``` 
My File Test

```

@RunWith(RobolectricTestRunner::class)
@Config(application = MainApplication::class)
class MyFlutterActivityTest {
    private lateinit var activity: MyFlutterActivity

    @Before
    fun setUp(){
        activity = Robolectric.buildActivity(MyFlutterActivity::class.java).setup().get()
    }

    @Test
    fun testSum(){
        assertThat(activity.sum(1,2)).isEqualTo(3)
    }
}
```

When I run Unit Test It Have Error 
<img width="1037" alt="image" src="https://github.com/flutter/flutter/assets/32449963/9c0dc7ec-ae4f-4f31-8a32-da9803699a0b">


### Expected results

Please tell me how to resolve this error and example how to unit test for FlutterActivity class. 

### Actual results

I have this error when run Unit Test
<img width="1037" alt="image" src="https://github.com/flutter/flutter/assets/32449963/63cf257b-7ecc-47db-90c7-4bda1bb421ce">


### Code sample

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</details>


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