Load fixture without a file path

Nobody has claimed this yet.

> from my understanding, we always have to define our fixture in a separate class,
> what i would really like is to define the fixture data inside my test function, (maybe not always but at least sometimes)
>
> i really like the idea of having a tight coupling between a test and the specific data it requires, to avoid creating some kind of global state that will be likely to break at scale.
>
> Is there any way to achieve that with your lib ? something like
>
> ```
> $this->databaseTool->loadFixturesInline(function(){ //define fixture code here... });
> ```

_Originally posted by @vulkanosaure in https://github.com/liip/LiipTestFixturesBundle/issues/64#issuecomment-1805054667_

The request concerns the fixture-loading entry point illustrated as `$this->databaseTool->loadFixturesInline(...)`; no file or test path is named, so start by tracing the bundle's existing fixture-loading API. Done means a test can define fixture data inside the test function without a separate fixture class, with the inline behavior covered by tests.

Written by the indexing model from the issue text.