When Should You Use JUnit BeforeEach?

• junit5

  13 6,166 9.7 Java

  ✅ The 5th major version of the programmer-friendly testing framework for Java and the JVM

  

In my last episode (https://youtu.be/cs2Wu9Co-2s) I said that we shouldn't use JUnit @BeforeEach to setUp test fields. Christoph Sturm (https://twitter.com/globalo) pointed out that there is an, erm, feature of JUnit 5 that means that we sometimes have to use @BeforeEach methods to initialise resources if we want them to be released in @AfterEach. The bug report is here https://github.com/junit-team/junit5/issues/1358 With or without this feature, we probably should use @BeforeEach to run code that will allocate non-memory resources that we need to free in @AfterEach, if only for symmetry. I suppose that also applies to any side-effects that we need to be reverted and that are not confined to the state of the test fixture.

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