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- Add credit_management_tests.rs with tests for SubscriberAccount, UsageEvent, UsageType, AccountStatus, and integer arithmetic operations - Add error_tests.rs with tests for ChargingError Display implementation, cloning, and log_error function - Add rating_billing_tests.rs with tests for ChargingRule variants, as_str conversion, billing period parsing, timestamp filtering, and cost calculations - Add validation_tests.rs with tests for validate_bytes, validate