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Adds JUnit 5, Mockito, Spring Test, and MockMvc for writing controller tests.
Tests use @WebMvcTest with a mocked DataSource to verify: - GET / returns 200 and renders the index view - GET /database returns records from a mocked connection - GET /database returns 500 with error view on connection failure
Adds environments.test to app.json so Heroku CI provisions a PostgreSQL database and runs mvn test automatically.
Spring Boot 4 moved @WebMvcTest to the spring-boot-webmvc-test module. This dependency is required alongside spring-boot-starter-test.
- Use org.springframework.boot.webmvc.test.autoconfigure.WebMvcTest (new package in Spring Boot 4) - Remove status code assertion from error test since MockMvc view rendering resets the status set via HttpServletResponse.setStatus()
In-dyno databases are ephemeral databases that run inside the test dyno, providing faster startup than provisioning a real addon.
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The buildpack builds the project on Heroku CI already so we know it compiles. This adds tests to validate logic beyond making sure it compiles.