Testing layers & principles: Ship code quickly
Blog post from Basis Theory
Basis Theory introduces a testing-series foundation describing how its eight-engineer team reportedly merged 3,353 pull requests over 12 months without customer-reported production issues by combining multiple testing layers and principles. Its “Swiss Cheese” approach includes unit, acceptance, UI, integration, synthetic, load, and security/compliance tests, each intended to catch different categories of defects from isolated code behavior to real-user workflows, performance, and vulnerabilities. The company emphasizes acceptance tests over unit tests for validating business behavior through public interfaces, along with small declarative tests, randomized test data, black-box testing, and deep-object equality assertions. It also advocates compiling software once into immutable artifacts that are promoted through environments, while using configuration-focused integration and operational tests after deployment, and argues that difficult acceptance testing can signal an overly complex product integration or design.
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