gRPC
Schema evolution is one of the hardest problems in distributed systems. When a gRPC service and its clients evolve independently — which they always do — a change to a .proto file can silently break production. This guide covers how to test Protocol Buffer schema compatibility before it becomes a production incident.
Testing
Managing Protobuf schemas across multiple services is painful without tooling. Proto files drift from naming conventions, breaking changes slip in without warning, and protoc invocations become unmaintainable shell scripts. buf is the modern solution: a CLI that handles linting, breaking change detection, and code generation with a single buf.yaml.
gRPC
gRPC streaming RPCs are among the most powerful features of the protocol — and among the hardest to test correctly. Unlike unary calls, streams introduce ordering, backpressure, partial failure, and cancellation scenarios that require different testing approaches. This guide covers testing all three streaming types: server streaming, client streaming, and bidirectional
gRPC
gRPC security testing is often skipped because certificates are annoying to set up in test environments. That's exactly why certificate misconfigurations, expired credentials, and bypass vulnerabilities make it to production. This guide covers practical approaches to testing gRPC TLS and authentication without making your CI pipeline miserable. What
Testing
gRPC-Web brings protocol buffer-based communication to browser clients, but testing it requires tools at every layer: buf for schema validation, gomock for server unit tests, grpc-web-fake for browser mocks, and Playwright fetch interception for end-to-end tests. This guide covers all of them. gRPC-Web
Testing
Real-time APIs — WebSocket, Server-Sent Events, gRPC streaming — are increasingly common but still poorly supported by most API testing tools. The category has matured significantly in the last two years: Postman added WebSocket support in 2021, Insomnia and Hoppscotch followed, and load testing tools like k6 and Artillery now
Protobuf
Protocol Buffers (Protobuf) is not just a serialization format — it's a schema system. When you change a .proto file, you're changing a contract that potentially affects every service that uses it. Testing Protobuf schemas means validating not just that serialization works, but that your changes don&
gRPC
Choosing between gRPC and REST involves architecture trade-offs that extend into your testing stack. The way you test these protocols differs significantly — in tooling, debugging overhead, contract management, and the kind of bugs each approach catches. This comparison focuses on the practical testing reality of each protocol, not just
gRPC
Go has first-class gRPC support via google.golang.org/grpc. The grpc-go package provides everything you need to build and test gRPC services — including testing utilities that let you run tests against real in-process servers without opening network ports. This guide covers the patterns that matter for
gRPC
gRPC services are harder to test than REST APIs. HTTP endpoints accept plain JSON you can curl in seconds; gRPC uses binary Protobuf encoding over HTTP/2 and requires generated client code to send requests. This complexity shows up in your test setup. This guide covers a complete gRPC testing
gRPC
Mocking gRPC services in Java is more involved than mocking REST APIs. You can't just stub HTTP responses — you need to mock at the gRPC protocol level, dealing with Protobuf messages, service stubs, and channel configurations. Two libraries make this tractable: GrpcMock for in-process gRPC mocking and
gRPC
Unit tests are fast but incomplete — they mock dependencies that can behave differently in production. Integration tests with Testcontainers close this gap by running real databases, caches, and dependent services in Docker containers that your test starts and manages. For gRPC services, this means testing against real PostgreSQL instead of