junit 5 code/config reuse. Should I use abstract test class or extension?

Question content

junit 5 document is using AbstractDatabaseTests

But I remember the recommended way in junit 4 is to use rules instead of extending classes.

Correct answer

ExampleUsing AbstractDatabaseTest it can be demonstrated that "JUnit Jupiter [in addition to registered extensions] also guarantees Wrapping behavior in class and interface hierarchies [...]".

Excerpted from User Guide一个>:

Extensions are a core feature of JUnit Jupiter and are considered more idiomatic than using inheritance.

Although JUnit Jupiter also supports inheritance (many annotations are @Inherited), the extension mechanism follows composition over inheritance . This gives you more flexibility, for example, since you can use multiple extensions, whereas inheritance is limited to a single class.

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