Contract Testing for Spring Boot and Angular: Catch Frontend-Backend Drift Before Production

Your Angular service reads courseName off every response. Last Tuesday the backend renamed that field to name. Both projects compile. Both test suites are green. Production shows a table full of blanks. Nothing in either codebase was wrong on its own. The Spring controller returns a perfectly valid DTO. The Angular CoursesService maps a perfectly valid TypeScript interface. The bug lives in th...