phpunit-injector VS Mockery

This unit test will fail when ran against the implementation from earlier. And in this situation a failing test is a good thing. But for this specific situation another "issue" has made it's way into the testcase; the unit test is now depending on the implementation that is being used for PSR-7. When working in a large codebase - like I currently am - one might have more than just a few usages of these interfaces and thus unit tests. Using the suggested approach, instantiating value objects instead of prophesizing, will lead to a large amount of object instantiations. And this will make switching to another implementation more work. Ideally this instantiating is centralized as much as possible. This is exactly why PSR-17 - HTTP Factories - was introduced. Typically dependencies - like these factories - are injected. For unit tests this is not feasible without plugins. My solution is a bit less fancy; a trait:

Continuous Integration - Testify, sqlmock, Mockery, Github Actions

Mockery is another framework for creating test doubles. It can be used with PHPUnit, phpspec, Behat, or any other testing framework. I find it especially powerful when working with legacy code, due to its support for creating partial mocks or mocking hard dependencies.

This works great if a method is tested that modifies and returns an object; we'll get an instance of that object and we are able to run all sorts of assertions on it. But what if this is not the case. What if we have a situation where a value object is passed as a parameter, some modifications are done and the value object is passed to another object. Something like the middleware from the example earlier. Some testing frameworks like Mockery offer spies to test these situations. When using Prophecy this situation can be handled using Argument::that():