What is going on here? I was cleaning up my `BaseA...

# dagger

[vide]

What is going on here? I was cleaning up my BaseApplication and when I remove the last injection, I get this when compiling tests:

Cannot process test roots and app roots in the same compilation unit:
  App root in this compilation unit: vide.BaseApplication
  Test roots in this compilation unit: [vide.Test1, vide.Test2, ...]

[vide]

my classes look like this:

// main
@HiltAndroidApp
class MainApplication : BaseApplication()
open class BaseApplication : BlahBlahApplication()
open class BlahBlahApplication : Application()

and

// tests
open class TestApplicationBase : BaseApplication()

@CustomTestApplication(TestApplicationBase::class)
interface TestApplication

There's some base stuff in BlahBlahApplication that is overriden differently depending on if we're running in tests or not

[vide]

If I add (for example) this to MainApplication, it compiles fine

@HiltAndroidApp
class MainApplication : BaseApplication() {
    @Inject lateinit var app: Application
}

[vide]

Why does hilt/dagger consider BaseApplication the application root if not injecting anything to MainApplication 🤔

[vide]

If anyone else happens to stumble into this issue, I cleaned up the inheritance to only inherit Application at the MainApplication level and Hilt is happy again. I would definitely want to understand what is going here though.

// main
@HiltAndroidApp
class MainApplication : BaseApplication()
abstract class BaseApplication : Application(), BlahBlahApplication
interface BlahBlahApplication

// tests
open class TestApplicationBase : BaseApplication()

@CustomTestApplication(TestApplicationBase::class)
interface TestApplication