Speed up writing tests with Wiremock Spring Boot
summary
Shows how WireMock Spring Boot spins a test server and injects its URL into Spring properties, so unit tests hit a local mock instead of the real API. Builds a JsonPlaceholder to‑do client, provides JsonPlaceholder mappings for GET/POST/PUT, and asserts the GET all returns 200 todos from the mapping, POST assigns an ID (201), and error paths return 500 so exception handling is verified.
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