Testing
PowerMock exists because Mockito has hard limits. Mockito cannot mock constructors, cannot intercept new calls inside a method under test, and cannot directly invoke private methods for assertion. PowerMock lifts those limits by bytecode-manipulating your classes at test time. That power comes with real costs — complexity, classloader isolation, slow
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
AI agents call external APIs — search engines, databases, Slack, GitHub, payment processors. Mocking these in tests is essential: real APIs are slow, rate-limited, non-deterministic, and sometimes irreversible. This guide covers four mocking strategies for agentic systems: HTTP interception, tool-level mocking, record/replay, and in-process fakes. An
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