Speeding Up Your Spring Boot Tests: Practical Tips and Code Examples

When your Spring Boot test suite takes too long, it slows you down. Slow tests discourage frequent runs, break your flow, and can even mask issues that pop up in between test executions. The good news: you can do a lot to shrink that runtime. Let’s look at some strategies and accompany them with a few code examples to make things clearer.

for free reading -> https://erkanyasun.medium.com/speeding-up-your-spring-boot-tests-practical-tips-and-code-examples-8b6adbd129e0?source=friends_link&sk=64c29bcb8b2252d23ca25cb77d943585

1. Trim the Spring Context

The Problem:
A full @SpringBootTest loads the entire application: controllers, services, security configs, messaging beans—everything. This can be expensive, especially when you only need a sliver of the application for your test.

The Fix:
Use more selective annotations. For instance, if you’re testing a web controller’s JSON response, @WebMvcTest loads only web components. If you’re testing a JPA repository, @DataJpaTest focuses on data layers.

Example:

// Instead of:
@SpringBootTest
class MyControllerIntegrationTest {
    @Autowired
    MockMvc mockMvc;
    @Test
    void…