how to mock DynamoDB mapper transactionwrite() method using Mockito?

My use-case is that I am using dynamoDB mapper's transactionWrite() method. I am doing 2 put operations in my TransactionWriteRequest.

Now, when I am trying to verify the same using verify(dynamoDBmapper).transactionWrite(writeRequest);

Output

 => Argument(s) are different! Wanted:
     [java] dynamoDBMapper.transactionWrite(
     [java]     ...dynamodbv2.datamodeling.TransactionWriteRequest@4ee37ca3
     [java] );
     [java] -> at
    ...MyTestClass.myMethod_withValidData_returnSuccess(MyTestClass.java:99)
     [java] Actual invocation has different arguments:
     [java] dynamoDBMapper.transactionWrite(
     [java]     ...dynamodbv2.datamodeling.TransactionWriteRequest@45c8d09f