Random Beans

There are many instances while writing test cases, where we wanted a baked object with some default values, which we then modify partially as per the need for the test.
Random beans exactly achieves this

I have a Pnl object which has PnlKey. For my test, I need test data with different key elements - date, book, account, etc - so that I can check if the aggregation on those levels works perfectly.

So for the test setup, I would want to create a lot of Pnl objects with only certain concerned attributes with values, say,
date - last 5 days
book - from 1 to 10
etc

public class Pnl {

      private PnlKey pnlKey;

}

public class PnlKey {

    private String custodianAccount;



    private Integer bookId;



    private Integer pnlSpn;



    private Date date;



    private Integer bundleId;



}

@Bean
public EnhancedRandom getEnhancedRandomForPnl() {
 Randomizer<Date> dateRandomizer = () -> {
  int max = dates.length;
  Random random = new Random();
  return dates[random.nextInt(max)];
 };
 Randomizer<Integer> bookRandomizer = () -> {
  int min = 1;
  int max = 10;
  Random random = new Random();
  return min + random.nextInt((max - min) + 1);
 };
 Randomizer<Integer> bundleRandomizer = () -> {
  int min = 11;
  int max = 20;
  Random random = new Random();
  return min + random.nextInt((max - min) + 1);
 };
 Randomizer<String> custodianAccountRandomizer = () -> {
  Random random = new Random();
  return custodianAccounts[random.nextInt(custodianAccounts.length)];
 };
 EnhancedRandom enhancedRandom = EnhancedRandomBuilder.aNewEnhancedRandomBuilder()
   .randomize(Date.class, dateRandomizer)
   .randomize(new FieldDefinition<>("bookId", Integer.class, PnlKey.class), bookRandomizer)
   .randomize(new FieldDefinition<>("bundleId", Integer.class, PnlKey.class), bundleRandomizer)
   .randomize(new FieldDefinition<>("custodianAccount", String.class, PnlKey.class),
     custodianAccountRandomizer)
   .build();
 return enhancedRandom;
}

You can check how this is configured here

And how it is accessed/tested here