Currently, the PHPDoc states that a string should be returned, but that's not correct.
It can be anything that is echo-able.
That means any scalar, Stringable and even null.
This PR was merged into the 3.x branch.
Discussion
----------
Migrate NodeTestCase to static data providers
PHPUnit 11 requires data providers to be static. This PR prepares our abstract `NodeTestCase` by deprecating the non-static `getTests()` and adding a static `provideTests()` as a replacement. I've also added PHPUnit attributes which newer PHPUnit releases prefer over PHPDoc annotations.
Commits
-------
f555a33c Migrate NodeTestCase to static data providers
Ruud Kamphuis
Fabien Potencier
Alexander M. Turek
Nicolas Grekas