StubManualImplementation.kt

interface NoteApi {
    suspend fun uploadNote(note: Note): Result
    suspend fun fetchAllNotes(): List<Note>
}

class RealNoteApi : NoteApi {
    override suspend fun uploadNote(note: Note): Result {
        //Real implementation
    }

    override suspend fun fetchAllNotes(): List<Note> {
        //Real implementation
    }
}

class StubNoteApi(
  val notes: List<Note> = listOf(), 
  val result: Result = Result.Success
) : NoteApi {
    override suspend fun uploadNote(note: Note): Result {
        return result
    }

    override suspend fun fetchAllNotes(): List<Note> {
        return notes
    }
}