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Uses the JPA slice for mappings and repositories while recognizing embedded-database substitutions and transaction-owned blind spots.
Separates full Spring MVC dispatch over mock Servlet objects from tests that cross an actual network and container boundary.
Focuses unit tests on stable behavior, meaningful boundaries, deterministic outcomes, and useful failure messages.
Tests rendered behavior, user interaction, outputs, and visible failure states without coupling to private implementation details.
Uses harnesses for reusable or complex widgets where a stable user-oriented test API is more valuable than direct DOM coupling.
Chooses a focused MVC slice or full application context based on whether the risk is the web contract or complete wiring.
Overrides unstable external boundaries intentionally while keeping the framework behavior and real collaborators the test claims to prove.
Finds missing render notifications that forced test change detection can hide and uses production-like stability checks.
Explains how to choose an E2E flow, control test data, avoid brittleness, and cover frontend/API integration risk.
Uses browser and direct HTTP checks to verify nested route entry, reload, base paths, assets, genuine 404s, and API boundaries after deployment.