Building RandBox from Scratch (4/5): Testing System and Quality Assurance

Test Philosophy

• Start specific, then go broader.
• Validate ranges, formats, and locale constraints.
• Use deterministic seeds for reproducibility.

Coverage

• Basics: numeric ranges, string charsets, template placeholders
• Person: name locales, gender matching, birthday ranges
• Location: coordinate precision, phone formats, postal/zip
• Finance: Luhn validation, expiry bounds, currency codes
• Text: lengths and composition, emoji sets
• Time: bounds and rollovers, timezone correctness
• Web: protocol/domain/email rules, IP formats

CI and Tooling

• Integrate tests into CI pipelines with reporting.
• Use lightweight fixtures and snapshot tests where helpful.

Outcome

Confidence in correctness and stability lets RandBox be used for serious prototyping and testing workflows.