Testing
Payment fraud takes many forms — card testing attacks, negative amount injection, currency confusion, duplicate charge races, and webhook replay. Standard happy-path payment tests don't catch these scenarios. This guide covers testing adversarial and edge-case payment flows that expose real fraud and reliability vulnerabilities. Card Testing Attack Prevention Card
Testing
Payment flows are among the most critical user journeys in any application. A broken checkout means lost revenue; a broken refund flow means customer support calls. End-to-end payment testing validates the complete flow from clicking "Buy" through webhook processing and database updates. This guide covers E2E payment testing
Testing
OAuth 2.0 and OpenID Connect (OIDC) are the foundation of modern authorization. Testing them is challenging because they involve multiple parties (client, authorization server, resource server), time-sensitive tokens, and complex flows. Bugs in OAuth implementations lead to security vulnerabilities that are hard to detect manually. This guide covers testing
Testing
Multitenancy bugs are among the most dangerous in SaaS applications — a data leak between tenants can expose customer data to competitors, trigger regulatory penalties, and destroy trust. Testing tenant isolation systematically prevents these catastrophes. This guide covers multitenancy testing: verifying data isolation, testing API-level tenant boundaries, detecting cross-tenant data leakage,
Testing
Embedding models are the foundation of vector search, RAG pipelines, and semantic applications. When you switch embedding models, update to a new version, or change preprocessing, the entire downstream system is affected. Without a testing strategy, you may not notice degraded retrieval quality until users complain. This guide covers testing
Testing
Electron apps run web content in a desktop shell with access to Node.js APIs. This combination is powerful — and dangerous. Security vulnerabilities in Electron apps can lead to remote code execution (RCE), making security testing not optional but critical. This guide covers automated security testing for Electron applications: testing
Testing
Playwright has first-class support for Electron application testing since v1.9. Unlike Spectron (deprecated) or older Electron testing approaches, Playwright connects to Electron directly — giving you access to both the renderer process (web content) and the main process (Node.js environment) in a single test. This guide covers Electron E2E
Testing
Payment provider SDKs make real HTTP calls that cost money, have rate limits, and behave differently in different environments. Mocking payment providers in tests lets you test all payment scenarios — successful payments, declines, network errors, and edge cases — without making real API calls. This guide covers mocking strategies for payment
Testing
Desktop apps must work on Linux, macOS, and Windows — and each platform has different rendering engines, file system behaviors, system APIs, and distribution formats. A CI/CD pipeline that only tests on one platform misses platform-specific bugs. This guide covers building cross-platform CI/CD testing pipelines for desktop applications built
Testing
Module Federation in Webpack 5 enables true micro-frontend architecture — separate teams building, deploying, and updating independent JavaScript bundles that compose into a single application at runtime. The testing challenges this introduces are real: federated modules can fail to load, version contracts can break silently, and the shell app's
Testing
Subscription billing is complex. A user upgrades mid-cycle, downgrades at renewal, reactivates after cancellation, or disputes a charge — each scenario has specific proration rules, invoice behaviors, and state transitions. Without systematic testing, billing bugs are guaranteed. This guide covers testing subscription lifecycle scenarios: plan changes, proration, trial periods, invoice generation,
Testing
@testing-library/vue applies Testing Library's core philosophy to Vue 3 component tests: query elements the way users find them, interact with the interface like a user would, and assert on visible outcomes rather than implementation details. This guide shows how to write Vue 3 component tests with Testing