tests: store SVG and URI values to files

[Hayk-1315]

Hi,

This PR addresses issue #1264.

Moved hardcoded expectedSVG and expectedTokenURI strings from test files to separate files under tests/data/

Used vm.readFile to load the content in both generateSVG.t.sol and tokenURI.t.sol

Ensured test logic remains intact and structure unchanged

No other modifications to business logic

Let me know if you'd like the file locations to be changed or prefer another folder structure for test fixtures.

Thanks in advance!

[smol-ninja]

Thank you for the PR @Hayk-1315. The lint checks are failing. Would you like to fix them?

You can use just full-check to run lint checks locally and just full-write to format the code. Recently, we migrated to Just as our preferred runner command. You can find the details in the contribution guide on how to install and use it.

Let me know if you have any question about it.

[Hayk-1315]

Hi ;)
Lint errors fixed using just full-write.
Let me know if anything else needs adjustment.

Thanks in advance!

[Hayk-1315]

Hello!

I wanted to provide an update regarding the failing test in "generateSVG.t.sol".

All three SVG files were moved to "tests/data/", and are being read using "vm.readFile(...)". I’ve confirmed:

• The files are properly encoded as UTF-8 without BOM
• Line endings are set to LF
• Paths are correct and relative to the project root
• The "--ffi" flag is enabled in local tests
• The other test using "vm.readFile("tests/data/token_uri.json")" passes successfully

Despite this, I'm still getting the following error locally, even with "--ffi":

vm.readFile: the path tests/data/expected_svg_1.svg is not allowed to be accessed for read operations

This leads me to believe it might be related to a sandbox or security policy in the local environment, or potentially a project-level restriction on certain file types or paths.

Let me know if there's anything specific in the CI configuration that I should adapt to or to adjust the structure or move the test if needed!

Thanks again for the review and guidance.