Testing
Flagsmith supports local evaluation mode where flag rules are downloaded once and evaluated in-process. This makes it ideal for testing—no HTTP calls during test runs. This guide covers testing flag evaluation, targeting rules, percentage rollouts, and identity overrides in Jest without a running Flagsmith instance. Why Flagsmith Is
Prisma
Testing database code is one of the trickiest parts of a backend application.
Expo
Expo adds a layer of abstraction over React Native that requires specific testing strategies. The jest-expo preset handles most of the configuration complexity, but mocking expo-* modules, testing Expo Router's file-based navigation, and connecting Detox to the bare workflow each have their own patterns. This guide
Apollo Server
Apollo Server v4 made significant changes to how the server is structured and how testing works. The old apollo-server-testing package is gone.
React Native
Testing React Native applications introduces a unique set of challenges that don't exist in web testing.
Testing
Socket.io is the de-facto standard for bidirectional real-time communication in Node.js applications.
Testing
Jest snapshot testing is simultaneously the most misused testing feature in the React ecosystem and genuinely useful when applied correctly.