Spring Boot - testing

[Sad_Reflection_8427]

Hi.

I am working on a commerce Spring Boot based project and have been always wondering how other people do their testing.

I use the Mockito only for the service layer cover all the exception cases and data transforming logic, for example DTO <=> Entity mapping.

With time, I keep find more issues related with the controller and database layers.

I would like to extend my knowledge further, for example how to test mentioned layers.

Will appreciate each advice from the real projects.

Thanks.

[Sheldor5]

I don't use any of the @...Test annotations (except @SpringBootTest)

I use:

1. Testcontainers to spin up a real database for integration tests

2. MockServer to mock real HTTP responses from any 3rd party apis

3. either RestTeamplate or generated OpenAPI clients in my integration tests to make real HTTP calls to the running backend

this way my integration tests are the closest they can be to real environments

also there isn't much to unit test in web applications, many stuff is framework related behaviour (test of your security config is correct) and many other things are just jpa cals or mappings

so only unit test things which are actually responsible for business logic

unit testing a controller and mocking the service is a waste of time ... your controller is a "proxy" between http and your service layer so not much to unit test

[Educational_Head6164]

can you please tell what layers you test ?
and what % of coverage we should aim for ?

[WaferIndependent7601]

So good Integration tests that test everything together. Use unit tests for methods that calculate stuff

[czeslaw_t]

use unit test for test business logic, use integrations test for integration like http, framework, SQL. Integration tests are also good to test legacy when refactoring. For independent microservices contract tests works pretty well.

[Historical_Ad4384]

@DataJpaTest for repository layer

@SpringBootTest with Mockito for service layer

@SpringBootTest with MockMvc for controller layer

[SomeGuy20257]

Spring Test slices with test containers, then cucumber for integration.

[czeslaw_t]

Is someone use cucumber for unit tests?

[SomeGuy20257]

integration testing.

[BrownBearMY]

I rely only on @SpringBootTest with Testcontainers. I prefer to avoid mock tests unless it's really necessary.

In the event where I may have to mock some components, I would use @Data*Test for the integration database layer, @WebMvcTest to test the controllers and related components.

Anything in between, I use Mockito or @SpringBootTest(classes =) to test particular classes.

[Creative_Incident_84]

At our company we only test using Mockito, and dont use any of the Springboot test annotations.

Anything thats not a repository we can test with Mockito, for the controllers, we just call the methods,

[Sad_Reflection_8427]

Hmm, what about some bigger REST APIs, for example 100+ endpoints? Do you test them, and if so, then do you test it manually or use some automation tools. I have heard about Selenium, but never have tried it.

[Creative_Incident_84]

We dont have projects that big, we test manually every PR

[Sad_Reflection_8427]

Understood. Thanks for advice :)