Jackson JsonNode with "primitive" JSON and JUnit testing of getRequestIdAsString()

RequestIdHandler.java

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

public class RequestIdHandler
{
	ObjectMapper objectMapper = new ObjectMapper();
	JsonNode requestId;


	public RequestIdHandler( int input ) throws JsonProcessingException
	{
		this.requestId = objectMapper.readTree( String.valueOf( input ) );
	}


	public RequestIdHandler( String input ) throws JsonProcessingException
	{
		this.requestId = objectMapper.readTree( input );
	}


	public JsonNode getRequestId()
	{
		return this.requestId;
	}


	public int getNextRequestId()
	{
		return this.requestId.asInt() + 1;
	}


	public int getLastRequestId()
	{
		return this.requestId.asInt();
	}


	public String getRequestIdAsString()
	{
		return this.requestId.asText();
	}


	public int getRequestIdAsInt()
	{
		return this.requestId.asInt();
	}


	public void setRequestId( JsonNode input )
	{
		this.requestId = input;
	}


	/**
	 * This method is working properly.
	 *
	 * @throws JsonProcessingException if the requestId cannot be parsed by ObjectMapper.
	 */
	public void setRequestId( String input ) throws JsonProcessingException
	{
		this.requestId = objectMapper.readTree( input );
	}


	/**
	 * This method is working properly.
	 *
	 * @throws JsonProcessingException if the requestId cannot be parsed by ObjectMapper.
	 */
	public void setRequestId( int input ) throws JsonProcessingException
	{
		this.requestId = objectMapper.readTree( String.valueOf( input ) );
	}


	/**
	 * This method is working properly.
	 *
	 * @throws JsonProcessingException if the requestId cannot be parsed by ObjectMapper.
	 */
	public void incrementRequestId() throws JsonProcessingException
	{
		if( this.requestId.isInt() )
			this.requestId = objectMapper.readTree( String.valueOf( this.requestId.asInt() + 1 ) );
	}


	/**
	 * This method is working properly.
	 *
	 * @return true if the requestId is an integer type.
	 */
	public boolean isRequestIdAutoIncrement()
	{
		return this.requestId.isInt();
	}
}