Testing Spring Boot Applications — Spring Technical Interview Questions & Answers

@SpringBootTest, MockMvc and slice tests.

Testing Spring Boot Applications

  • Boot testing helps you verify slices of the app or the full context.
  • @SpringBootTest: loads a broader application context.
  • MockMvc: test web layer without a real browser.
  • Slice tests: focus on web, data, or JSON pieces for speed.
  • Use mocks for dependencies when unit-testing services.
  • Choose full test vs slice test based on what you need to prove.

Technical Interview Tip: Name MockMvc and @SpringBootTest with one use each.

Code Examples for Testing Spring Boot Applications

Testing Spring Boot Applications — working example

// Topic: Testing Spring Boot Applications
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
class TopicController {
  @GetMapping("/api/topic")
  String topic() {
    return "Spring Boot: Testing Spring Boot Applications";
  }
}

Testing Spring Boot Applications: GET /api/topic returns this title string.

How to Explain Testing Spring Boot Applications to an Interviewer

What is Testing Spring Boot Applications (sb misc)?

Used for a short Testing Spring Boot Applications sb misc example a small REST app Not just the heading

Give one small example of Testing Spring Boot Applications (sb misc).

the smallest Testing Spring Boot Applications sb misc example you can type @SpringBootTest, MockMvc and slice tests

What mistake do beginners make with Testing Spring Boot Applications (sb misc)?

only saying “Testing Spring Boot Applications sb misc” with no example Show the fix

Where do you use Testing Spring Boot Applications (sb misc)?

a small REST app a short Testing Spring Boot Applications sb misc example