[TheJavaGuy]

Summary

Introduces a new CreditCard faker that generates realistic credit card test data for e-commerce checkout testing, payment gateway integration, and PCI compliance scenarios.

Key features:

• Card numbers with valid Luhn checksums for all major card types (Visa, Mastercard, Amex, Discover, Diners Club, JCB, etc.)
• CVV codes (3 digits standard, 4 for American Express)
• Expiration dates (both future and expired)
• Cardholder names in uppercase format
• Issuing bank names (Chase, Bank of America, Wells Fargo, etc.)
• Masked card numbers for display (**** **** **** 1234)
• Plain (no dashes) and formatted number outputs
• Network name lookup

Implementation approach:

• Delegates to existing Finance.creditCard() for Luhn validation
• Provides dedicated API with expanded functionality beyond Finance methods
• Follows existing project patterns and conventions
• Registered in EnFile.java for YAML data loading

Files changed:

• New CreditCard.java provider class (224 lines)
• New credit_card.yml data file with card patterns and bank names
• New CreditCardTest.java with 18 comprehensive tests
• Updated Faker.java to register the provider
• Updated EnFile.java to load YAML data
• Added LEARNINGS.md documenting common mistakes for future contributors
• Added CREDITCARD_FAKER_SPEC.md with full feature specification

Test plan

• All 18 CreditCard tests pass
• Full test suite passes (85,165 tests, 0 failures)
• All generated card numbers pass Luhn validation
• CVV codes are correct length per card type (3 or 4 digits)
• Expiration dates are correctly formatted and in future
• Expired dates are correctly in the past
• Cardholder names are uppercase with space separator
• Bank names are fetched from YAML data
• Masked numbers follow correct format
• Network names match card types

Example usage:

Faker faker = new Faker();

faker.creditCard().number()                    // "4532-1234-5678-9012"
faker.creditCard().number(CreditCardType.VISA) // "4111-2222-3333-4444"
faker.creditCard().cvv()                       // "123"
faker.creditCard().expirationDate()            // "03/27"
faker.creditCard().cardholderName()            // "JOHN SMITH"
faker.creditCard().bank()                      // "Chase"
faker.creditCard().maskedNumber()              // "**** **** **** 4532"

[coveralls]

Pull Request Test Coverage Report for Build 21816642455

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.5%) to 96.506%

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Files with Coverage Reduction	New Missed Lines	%
org/thejavaguy/javafaker/Commerce.java	1	92.86%

Totals
Change from base Build 21816009898:	-0.5%
Covered Lines:	1812
Relevant Lines:	1857

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💛 - Coveralls