Align TransactionManagementConfigurer support in TestContext framework with production

[friscoMad]

Affects: Spring Framework 4.3.0+

When @Primary support was added for spring-test in 677a321, the lookup was added before TransactionManagementConfigurer lookup and not after as it should have been, given that TransactionManagementConfigurer should take higher precedence. In fact maybe it should be the first check even before the beansOfTypeIncludingAncestors lookup as the configurer can construct a TransactionManager that is not a registered bean (a registered bean could be in the context that is not the one that the configurer will return).

Steps to reproduce

Configure a context with a @Primary TransactionManager and a TransactionManagementConfigurer.

Current result

Test uses the @Primary annotated bean.

Expected result

Test should use the bean provided by TransactionManagementConfigurer.

[sbrannen]

Thank you for bringing this to our attention! 👍

There is indeed a discrepancy between the transaction manager lookup algorithm in production code and the algorithm used within the Spring TestContext Framework (TCF).

I introduced tests for the status quo for production code in 144b0e1 and for the TCF in a5498ba.

In Spring Framework 5.3 we will revise the transaction manager lookup in TestContextTransactionUtils so that a transaction manager configured via the TransactionManagementConfigurer API is favored over a @Primary transaction manager.

[friscoMad]

Thank you for such fast reply.
I know that this situation is a fringe case (I have several configurations in my classpath that I can not remove) and probably not a lot of projects are using TransactionManagementConfigurer
I did some more test after the report to confirm that in production it does work as it should and I think that the lookup is here and has this priority:

1. Qualified
2. TransactionManagementConfigurer
3. Regular bean search (@primary or single one)

[sbrannen]

This has been addressed in 613bd3b.

Feel free to try it out in an upcoming 5.3 M1 snapshot.

[friscoMad]

I will try as soon as posible but while the change does fix my initial report and my use case, it still does not replicate production transaction manager lookup, at least by my understanding looking at production code, the TransactionManagementConfigurer is the top priority unless the annotation is qualified, so by my understanding the code block in lines 187-191 (single transaction manager bean) should be moved after TransactionManagementConfigurer block