Coverage Summary for Class: GetTransferCounterpartUseCase (com.georgeci.moneysurfer.domain.usecase)

 package com.georgeci.moneysurfer.domain.usecase
 
 import com.georgeci.moneysurfer.domain.model.Transaction
 import com.georgeci.moneysurfer.domain.repositories.TransactionRepository
 import org.koin.core.annotation.Single
 
 /**
  * The other leg of the transfer [transaction] belongs to, or `null` when it is not a transfer
  * at all or its pair is missing.
  *
  * A transfer is two ordinary rows sharing a `transferId` — an `EXPENSE` on the source account
  * and an `INCOME` on the destination (see `CreateTransferUseCase`). Neither row knows the other
  * account, so anything that wants to say "from X to Y" has to resolve the sibling first.
  *
  * A missing pair is a legitimate state, not a bug to throw on: a leg can arrive from sync or a
  * CSV import before (or without) its counterpart.
  */
 @Single
 class GetTransferCounterpartUseCase(
     private val transactionRepository: TransactionRepository,
 ) {
 
     suspend operator fun invoke(transaction: Transaction): Transaction? {
         val transferId = transaction.transferId ?: return null
         return transactionRepository.getByTransferId(transferId)
             .firstOrNull { it.id != transaction.id }
     }
 }