Benjamin Otte 12a97ef422 testsuite: Add a forgotten test ...

The test existed in git but wasn't hooked up. So let's do that by:

1. Adding it to the build
2. Adapting it a bit so rounding errors really don't trigger (as the
   original commit claimed they shouldn't).
3. Re-renaming it because this was actually about 3d gradients

2023-12-26 05:03:24 +01:00

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