How do I mock a TransactionManager in a JUnit test, (outside of the container)?

We simply create an empty implementaion for the transaction manager, and ensure that this implementation is used in the spring-context used by the unit test

package sample;import org.springframework.stereotype.Service;import org.springframework.transaction.PlatformTransactionManager;import org.springframework.transaction.TransactionDefinition;import org.springframework.transaction.TransactionException;import org.springframework.transaction.TransactionStatus;public class MockedTransactionManager implements PlatformTransactionManager {    @Override    public TransactionStatus getTransaction(TransactionDefinition definition) throws TransactionException {        return null;    }    @Override    public void commit(TransactionStatus status) throws TransactionException {    }    @Override    public void rollback(TransactionStatus status) throws TransactionException {    }}

.. and in the spring-xml file then looks like..

<bean id="transactionManager" class="sample.MockedTransactionManager"/>

You can also use Mockito:

PlatformTransactionManager manager = mock(PlatformTransactionManager.class);

You can use PseudoTransactionManager:

PlatformTransactionManager manager = new PseudoTransactionManager();