16 Testing Spring applications

This chapter covers

  • Understanding dependency injection
  • Building and testing a Spring application
  • Using SpringExtension for JUnit Jupiter
  • Testing Spring application features with JUnit 5

“Dependency Injection” is a 25-dollar term for a 5-cent concept.

--James Shore

Spring is a lightweight--but at the same time flexible and universal--open source set of frameworks for creating Java applications. It is not dedicated to any particular layer, which means it can be used at the level of any layer of a Java application. This chapter will focus on the basis of Spring: the dependency injection (or inversion of control) pattern; and how to test core Spring applications with the help of JUnit 5.

16.1 Introducing the Spring ...

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