Integration Tests: Consecutive `dispatch($uri)` on Test AbstractController fails

[lbajsarowicz]

Preconditions (*)

1. Integration Tests in Magento 2.4-develop

Steps to reproduce (*)

1. Create a test that uses \Magento\TestFramework\TestCase\AbstractController::dispatch for dispatching controller.
2. Add the second request to any other URI.

Expected result (*)

1. Both requests are dispatched

Actual result (*)

1. First request is dispatched
2. Second request throws InvalidArgumentException: Invalid return type

[m2-assistant]

Hi @lbajsarowicz. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento give me 2.4-develop instance - upcoming 2.4.x release

For more details, please, review the Magento Contributor Assistant documentation.

@lbajsarowicz do you confirm that you were able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

---

• Join Magento Community Engineering Slack and ask your questions in #github channel.

[magento-engcom-team]

Hi @lbajsarowicz. Thank you for your report.
The issue has been fixed in #27300 by @lbajsarowicz in 2.4-develop branch
Related commit(s):

• 5d0c97255f83c6aead003a420a8db803a7085b2d
• ba8d3669a7b498759023dc9518e5339764e0170b
• 4286297f0f69dcf0524542afba11be5c3c7f6634
• 5a2673d2b5c0f976bee50ac87491babfed29ecb3

The fix will be available with the upcoming 2.4.0 release.