seems like box2d extensions are broken because of the 1.13.5 update. Don't know what has changed there tbh

Box2D test issues are resolved now. I also increased the fault tolerance of the profiling tests. On my machine I had 0.016f as a value which made the test fail. That's why I simply updated the tolerance. Shouldn't be a big deal.

Regarding Box2D:
There were some changes for 1.13.5: libgdx/libgdx#7579
From what I understood you need platform specific natives for that to work which you have per default in a typical LibGDX app. But the tests in KTX were missing that dependency for the tests. Also, since we don't have an ApplicationListener in those tests, we need to manually call GdxNativesLoader.

@czyzby: can you please have a look at the failing github action? I run gradle test on my machine and all tests were passing. So should be fine but the gradle wrapper validation is failing here?

Gradle wrapper validation fails sometimes, I reran the jobs. This should address #499, right? Thanks for submitting a PR for this @Quillraven!

After libGDX updates I tend to bump the version in a couple of additional places like the README (see f45df77), but I can merge this as is and push an extra commit. I'll only ask you to update version.txt in the repository root to 1.13.5-SNAPSHOT so that the latest snapshot release marked 1.13.1-SNAPSHOT is not built against libGDX 1.13.5 as snapshots are pushed automatically. See the contribution guide.

#499 is resolved bis this PR as well, you are correct.

I updated some areas where I found 1.13.1-SNAPSHOT

Thanks!