chore: solve PHPUnit 10 deprecations

[jordyvanderhaegen]

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[iwasherefirst2]

Hi @jordyvanderhaegen,

Thanks for your contribution! I noticed that you made $testUrl static instead of using it as a class property. I'm curious about the reasoning behind this choice—was it to emphasize that it's an unchanging value? If so, do you think using a constant might be more suitable for that purpose?

Additionally, I was wondering if we could rename testURL and testURL2 to something more descriptive, like LOCALHOST_WITH_DASH and LOCALHOST_WITHOUT_DASH. It might make the intent a bit clearer to others reading the code.

If you agree, I'd be happy to make these changes and push an update to your PR. Let me know what you think! 😊

[jordyvanderhaegen]

@iwasherefirst2 the reason behind changing it to static was quite simple, PHPUnit 10 requires data providers to be static. I didn't really bother improving it to be a constant, since it was a bit out of scope for this PR.

I'm not totally sure why the testUrl2 is even a thing, it doesn't provide any value. I've removed it in #922 😄

[iwasherefirst2]

Looks great!