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adding account unit test

This commit is contained in:
Gergo Petrik 2020-05-18 16:33:03 +02:00
parent 12ef94be39
commit c9453fe33a
1 changed files with 30 additions and 35 deletions
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61
core-java-modules/core-java-concurrency-advanced-3/src/test/java/com/baeldung/abaproblem/AccountUnitTest.java
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@ -5,7 +5,6 @@ import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
public class AccountUnitTest {
@ -20,7 +19,8 @@ public class AccountUnitTest {
@Test
public void zeroBalanceInitializationTest() {
assertEquals(0, account.getBalance());
assertTrue(account.getTransactionDates().isEmpty());
assertEquals(0, account.getTransactionCount());
assertEquals(0, account.getCurrentThreadCASFailureCount());
}
@Test
@ -44,60 +44,55 @@ public class AccountUnitTest {
assertEquals(defaultBalance - moneyToWithdraw, account.getBalance());
}
@Test
public void withdrawWithoutSufficientBalanceTest() {
assertThrows(RuntimeException.class, () -> account.withdraw(10));
}
@Test
public void abaProblemTest() throws InterruptedException {
final int defaultBalance = 50;
final int amountToWithdrawByThreadA = 20;
final int amountToWithdrawByThreadB = 10;
final int amountToDepositByThreadB = 10;
final int amountToWithdrawByThread1 = 20;
final int amountToWithdrawByThread2 = 10;
final int amountToDepositByThread2 = 10;
assertTrue(account.getTransactionDates().isEmpty());
assertEquals(0, account.getTransactionCount());
assertEquals(0, account.getCurrentThreadCASFailureCount());
account.deposit(defaultBalance);
assertEquals(1, account.getTransactionDates().size());
assertEquals(1, account.getTransactionCount());
Thread thread1 = new Thread(() -> {
Thread threadA = new Thread(() -> {
try {
// this will take longer due to the name of the thread
assertTrue(account.withdraw(amountToWithdrawByThreadA));
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
assertTrue(account.withdraw(amountToWithdrawByThread1));
// thread 1 fails to capture ABA problem
assertNotEquals(1, account.getCurrentThreadCASFailureCount());
}, "thread1");
Thread threadB = new Thread(() -> {
Thread thread2 = new Thread(() -> {
assertTrue(account.deposit(amountToDepositByThread2));
assertEquals(defaultBalance + amountToDepositByThread2, account.getBalance());
assertTrue(account.deposit(amountToDepositByThreadB));
assertEquals(defaultBalance + amountToDepositByThreadB, account.getBalance());
try {
// this will be fast due to the name of the thread
assertTrue(account.withdraw(amountToWithdrawByThreadB));
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
assertTrue(account.withdraw(amountToWithdrawByThread2));
// thread 1 didn't finish yet, so the original value will be in place for it
assertEquals(defaultBalance, account.getBalance());
assertEquals(0, account.getCurrentThreadCASFailureCount());
}, "thread2");
threadA.start();
threadB.start();
threadA.join();
threadB.join();
thread1.start();
thread2.start();
thread1.join();
thread2.join();
// compareAndSet operation succeeds for thread 1
assertEquals(defaultBalance - amountToWithdrawByThreadA, account.getBalance());
assertEquals(defaultBalance - amountToWithdrawByThread1, account.getBalance());
//but there are other transactions
assertNotEquals(2, account.getTransactionDates().size());
assertNotEquals(2, account.getTransactionCount());
// thread 2 did two modifications as well
assertEquals(4, account.getTransactionDates().size());
assertEquals(4, account.getTransactionCount());
}
}