chore: enforce camelCase PHPUnit method names

[loks0n]

Every package except image already used camelCase test method names, so the convention existed by habit rather than by rule — nothing stopped it drifting back.

pint.json gains one rule:

"php_unit_method_casing": {
    "case": "camel_case"
}

Now the wrong form is corrected on write rather than waiting for someone to notice it in review.

What it changes

Turning the rule on renames image's 39 test methods, which is the rest of the diff:

test_jpeg                  -> testJpeg
test_crop100x100           -> testCrop100x100
test_crop_gravity_nw       -> testCropGravityNw
test_webp_blob_output      -> testWebpBlobOutput
...

Nothing references them by name — the file's only #[DataProvider] names a provider method, not a test — and there are no @depends, no string references and no phpunit.xml filters. The suite passes unchanged: 56 tests, 358 assertions.

Pint also reported braces_position and single_line_empty_body on that file, but those only touch the signature lines it was already rewriting. The diff is renames.

Verified

• vendor/bin/pint --test passes repo-wide, and passed on main beforehand too, so the rule is the only thing this introduces
• bin/monorepo check image, test image and validate all pass
• No public function test_ remains anywhere in packages/*/tests

Note

I originally raised this thinking pools also had snake_case methods. It does not — pools was already camelCase on main, and image is the only package that needed fixing.

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