Bound Multiple Times issue when using Hilt for UI Test, TestInstalln

Hello, I’ve created a fake urlprovider binding and annotated with @TestInstallIn

@Module
@TestInstallIn(
    components = [SingletonComponent::class],
    replaces = [UrlModuleBindings::class]
)
abstract class FakeUrlBindings {

    @Binds
    abstract fun bindsUrlProvider(urlProvider: FakeUrlProvider): UrlProvider
}

This is inside androidTest my Prod UrlProvider looks like

@Module
@InstallIn(SingletonComponent::class)
abstract class UrlModuleBindings {

    @Binds
    abstract fun bindsUrlProvider(urlProvider: DefaultUrlProvider): UrlProvider
}

This is Original Binding when I’m running the UI test getting the error **UrlProvider is bound multiple times:**

As per the documentation everything seems correct, can I please know what is the issue with this.

Have followed https://dagger.dev/hilt/testing.html

https://stackoverflow.com/questions/70844153/bound-multiple-times-issue-when-using-hilt-for-ui-test-testinstalln

[bcorso]

Hi @ankitkhare,

Sorry for the delay!

To fix this, you need to remove the @Module.includes from AppModule.

- @Module(includes = [UrlModuleBindings::class, NetworkModule::class])
+ @Module
@InstallIn(SingletonComponent::class)
object AppModule {
  // ...
}

The issue is that while Hilt does uninstall the explicit UrlModuleBindings module usage in the generated code, it’s still transitively included by AppModule.

In Hilt, you shouldn’t ever need to use @Module.includes unless you’re including a non-Hilt module that you can’t use @InstallIn on directly. In this case, UrlModuleBindings already has @InstallIn on it so it shouldn’t be included by another module.

[bcorso]

Thanks for the sample project @ankitkhare!

I was able to repro the issue in your project, however it may take me a few days before I can start debugging and fixing it. I’ll update here once I know something.