How to do integ test using mockito

I have following two methods which i want to test

public class Orders {
    private final LambdaLogger logger;
    private final DynamoDBMapper dynamoDBMapper;

    public Orders(LambdaLogger logger, AmazonDynamoDB amazonDynamoDB){
        this.logger = logger;
        this.dynamoDBMapper = new DynamoDBMapper(amazonDynamoDB);
    }

    public List<Orders> getOrders(){
        logger.log("getting all orders");

        DynamoDBScanExpression scanExpression = new DynamoDBScanExpression()
                .withProjectionExpression("OrderId");
        logger.log("Expression created");

        PaginatedScanList<Orders> scan = dynamoDBMapper.scan(Orders.class, scanExpression);

        return scan.stream()
                .collect(Collectors.toList());
    }
}

Now, I want to do testing using Mockito for this class. There are couple of things that I am confuse (or unable to get working).

First, DynamoDBMapper is being created using amazonDynamoDBClient. So if in my class i Mock AmazonDynamoDB, how the dynamoDBMapper would get created?

How would I test that my function is actually setting projection right?

How would i test on paginatedScanList?