Example of a Data Factory class with JavaFaker

LoanDataFactory.java

public class LoanDataFactory {

    private static Faker faker;
    private static final int MIN_VALID_INSTALLMENTS = 2;
    private static final int MAX_VALID_INSTALLMENTS = 18;
    private static final int MAX_NUMBER_OF_DECIMALS = 2;
    private static final Long MIN_VALID_AMOUNT = Long.valueOf("1000");
    private static final Long MAX_VALID_AMOUNT = Long.valueOf("40000");

    private LoanDataFactory() {
        faker = new Faker();
    }

    public static Loan createLoan() {
        return new LoanBuilder().
                name(faker.name().firstName()).
                email(faker.internet().emailAddress())
                .amount(BigDecimal.valueOf(
                        faker.number().randomDouble(
                                MAX_NUMBER_OF_DECIMALS, MIN_VALID_AMOUNT, MAX_VALID_AMOUNT)))
                .installments(faker.number().numberBetween(MIN_VALID_INSTALLMENTS, MAX_VALID_INSTALLMENTS)).build();
    }
    
    // other methods ignored
}