### Question:
KernelTransactionImplementationHandle implements KernelTransactionHandle { @Override public boolean isOpen() { return tx.isOpen() && txReuseCount == tx.getReuseCount(); } KernelTransactionImplementationHandle( KernelTransactionImplementation tx, SystemNanoClock clock ); @Override long lastTransactionIdWhenStarted(); @Override long lastTransactionTimestampWhenStarted(); @Override long startTime(); @Override long startTimeNanos(); @Override long timeoutMillis(); @Override boolean isOpen(); @Override boolean markForTermination( Status reason ); @Override AuthSubject subject(); @Override Map<String,Object> getMetaData(); @Override Optional<Status> terminationReason(); @Override boolean isUnderlyingTransaction( KernelTransaction tx ); @Override long getUserTransactionId(); @Override String getUserTransactionName(); @Override Stream<ExecutingQuery> executingQueries(); @Override Stream<? extends ActiveLock> activeLocks(); @Override TransactionExecutionStatistic transactionStatistic(); @Override boolean isSchemaTransaction(); @Override boolean equals( Object o ); @Override int hashCode(); @Override String toString();  }### Answer:
@Test public void isOpenForUnchangedKernelTransactionImplementation() { int reuseCount = 42; KernelTransactionImplementation tx = mock( KernelTransactionImplementation.class ); when( tx.isOpen() ).thenReturn( true ); when( tx.getReuseCount() ).thenReturn( reuseCount ); KernelTransactionImplementationHandle handle = new KernelTransactionImplementationHandle( tx, clock ); assertTrue( handle.isOpen() ); }
@Test public void isOpenForReusedKernelTransactionImplementation() { int initialReuseCount = 42; int nextReuseCount = 4242; KernelTransactionImplementation tx = mock( KernelTransactionImplementation.class ); when( tx.isOpen() ).thenReturn( true ); when( tx.getReuseCount() ).thenReturn( initialReuseCount ).thenReturn( nextReuseCount ); KernelTransactionImplementationHandle handle = new KernelTransactionImplementationHandle( tx, clock ); assertFalse( handle.isOpen() ); }