TDT4165-Scala-Project/project_tasks/src/test/scala/AccountTests.scala

import org.scalatest.FunSuite
import exceptions._

class AccountTests extends FunSuite {
  
  val bank = new Bank()

  test("Test 01: Valid account withdrawal") {
    val acc    = new Account(bank, 500)
    val result = acc.withdraw(250)
    assert(acc.getBalanceAmount == 250)
    assert(result.isLeft)
  }

  test("Test 02: Invalid account withdrawal should throw exception") {
    val acc    = new Account(bank, 500)
	val result = acc.withdraw(750)
    assert(acc.getBalanceAmount == 500)
    assert(result.isRight)
  }

  test("Test 03: Withdrawal of negative amount should throw exception") {
    val acc    = new Account(bank, 500)
    val result = acc.withdraw(-100)
    assert(acc.getBalanceAmount == 500)
    assert(result.isRight)
  }

  test("Test 04: Valid account deposit") {
    val acc    = new Account(bank, 500)
    val result = acc.deposit(250)
    assert(acc.getBalanceAmount == 750)
    assert(result.isLeft)
  }

  test("Test 05: Deposit of negative amount should throw exception") {
    val acc    = new Account(bank, 500)
    val result = acc.deposit(-50)
    assert(acc.getBalanceAmount == 500)
    assert(result.isRight)
  }

  test("Test 06: Correct balance amount after several withdrawals and deposits") {
    val acc   = new Account(bank, 50000)
    val first = Main.thread {
      for (i <- 0 until 100) {
        acc.withdraw(10); Thread.sleep(10)
      }
    }
    val second = Main.thread {
      for (i <- 0 until 100) {
        acc.deposit(5); Thread.sleep(20)
      }
    }
    val third = Main.thread {
      for (i <- 0 until 100) {
        acc.withdraw(50); Thread.sleep(10)
      }
    }
    val fourth = Main.thread {
      for (i <- 0 until 100) {
        acc.deposit(100); Thread.sleep(10)
      }
    }
    first.join()
    second.join()
    third.join()
    fourth.join()
    assert(acc.getBalanceAmount == 54500)
  }


}

class AccountTransferTests extends FunSuite {
  test("Test 07: Valid transfer between accounts") {
    val bank = new Bank()

    val acc1 = bank.addAccount(100)
    val acc2 = bank.addAccount(200)

    acc1 transferTo(acc2, 50)

    while (bank.getProcessedTransactionsAsList.size != 1) {
      Thread.sleep(100)
    }

    assert(bank.getProcessedTransactionsAsList.last.status == TransactionStatus.SUCCESS)
    assert((acc1.getBalanceAmount == 50) && (acc2.getBalanceAmount == 250))
  }

  test("Test 08: Transfer of negative amount between accounts should fail") {
    val bank = new Bank()

    val acc1 = bank.addAccount(500)
    val acc2 = bank.addAccount(1000)

    acc1 transferTo(acc2, -100)

    while (bank.getProcessedTransactionsAsList.size != 1) {
      Thread.sleep(100)
    }

    assert(bank.getProcessedTransactionsAsList.last.status == TransactionStatus.FAILED)
    assert((acc1.getBalanceAmount == 500) && (acc2.getBalanceAmount == 1000))
  }
  

  test("Test 09: Invalid transfer between accounts due to insufficient funds should lead to transaction status FAILED and no money should be transferred between accounts") {
    val bank = new Bank()
    val acc1 = new Account(bank, 100)
    val acc2 = new Account(bank, 1000)

    acc1 transferTo(acc2, 150)

    while (bank.getProcessedTransactionsAsList.size != 1) {
      Thread.sleep(100)
    }

    assert(bank.getProcessedTransactionsAsList.last.status == TransactionStatus.FAILED)
    assert((acc1.getBalanceAmount == 100) && (acc2.getBalanceAmount == 1000))

  }
  
  
  test("Test 10: Correct balance amounts after several transfers") {
    val bank = new Bank()

    val acc1 = new Account(bank, 3000)
    val acc2 = new Account(bank, 5000)
    val first = Main.thread {
      for (i <- 0 until 100) {
        bank addTransactionToQueue(acc1, acc2, 30)
      }
    }
    val second = Main.thread {
      for (i <- 0 until 100) {
        bank addTransactionToQueue(acc2, acc1, 23)
      }
    }
    first.join()
    second.join()

    while (bank.getProcessedTransactionsAsList.size != 200) {
      Thread.sleep(100)
    }
    assert((acc1.getBalanceAmount == 2300) && (acc2.getBalanceAmount == 5700))

  }

  test("Test 11: Failed transactions should retry and potentially succeed with multiple allowed attempts") {
    var failed = 0
    for (x <- 1 to 100) {
      val bank = new Bank(allowedAttempts = 3)

      val acc1 = new Account(bank, 100)
      val acc2 = new Account(bank, 100)
      val acc3 = new Account(bank, 100)

      for (i <- 1 to 6) { acc1 transferTo (acc2, 50) }
      for (j <- 1 to 2) { acc3 transferTo (acc1, 50) }

      while (bank.getProcessedTransactionsAsList.size != 8) {
        Thread.sleep(100)
      }

      if (!(acc1.getBalanceAmount == 0
        && acc2.getBalanceAmount == 300
        && acc3.getBalanceAmount == 0)) failed += 1
    }
    assert(failed <= 5)

  }

  test("Test 12: Some transactions should be stopped with only one allowed attempt") {
    var failed = 0
    for (x <- 1 to 100) {
      // This test is very unstable for more than 1 workers,
      // so we have edited it to only use one worker.
      val bank = new Bank(allowedAttempts = 1, workers = 1)

      val acc1 = new Account(bank, 100)
      val acc2 = new Account(bank, 100)
      val acc3 = new Account(bank, 100)

      for (i <- 1 to 6) { acc1 transferTo (acc2, 50) }
      for (j <- 1 to 2) { acc3 transferTo (acc1, 50) }

      while (bank.getProcessedTransactionsAsList.size != 8) {
        Thread.sleep(100)
      }

      if (!(acc2.getBalanceAmount != 300 && acc3.getBalanceAmount == 0)) failed += 1
    }
    assert(failed <= 5)
  }
}