[Feature]: JUnit Jupiter extension for reuse of containers

Module

Core

Problem

Assume you have several integration tests splitted in some classes. All this tests can reuse the same container instance. If the container needs some time to setup that would be a great benefit.

Solution

By using the JUnit extension API it would be easy to create a custom annotation like this:

@ContainerConfig(name="containerA", needNewInstance=false) public void testFoo() {}

A container that is needed could be simply defined by a provider:

@ContainerProvider(name="containerA") public GenericContainer<?> createContainerA() {}

By using test lifecycle callbacks (https://junit.org/junit5/docs/current/user-guide/#extensions-lifecycle-callbacks) this could be achieved as a JUnit extension.

I would be happy to help by creating the feature :)

Benefit

Containers that are needed for multiple tests in multiple classes only need to be defined once and the instances can be reused.

Alternatives

Would you like to help contributing this feature?

Yes

Core モジュールから始め、issue で参照されている JUnit Jupiter extension API のライフサイクルコールバックを読みます。提案されている ContainerConfig アノテーションと ContainerProvider アノテーションが、テストクラス間でコンテナを登録して再利用する方法を定義し、そのうえで共有インスタンスが一度だけ作成され、needNewInstance リクエストは分離されたままになることを検証します。