Order of multiple extensions in JUnit 5

Question

If I use more than one extension with JUnit 5, whats the order? Ideally the order int the @ExtendsWith annotation is respected, but I could not find any documentation about that.

Example:

@ExtendWith({SpringExtension.class, InitH2.class})
public class VmRepositoryIntegrationTest {
  // Test implemenations
}

So in this example I need Spring to set up the DB connection before I cann initialize the DB.

Answer 1

From §5.2.1 of the JUnit 5 User Guide:

...

Multiple extensions can be registered together like this:

@ExtendWith({ DatabaseExtension.class, WebServerExtension.class })
class MyFirstTests {
    // ...
}

As an alternative, multiple extensions can be registered separately like this:

@ExtendWith(DatabaseExtension.class)
@ExtendWith(WebServerExtension.class)
class MySecondTests {
    // ...
}

Extension Registration Order

Extensions registered declaratively via @ExtendWith will be executed in the order in which they are declared in the source code. For example, the execution of tests in both MyFirstTests and MySecondTests will be extended by the DatabaseExtension and WebServerExtension, in exactly that order.