Increase test coverage for some rules

[dcorrea777]

• Add test for null value in the Cnpj rule.
• Add UploadedFileInterface object test for Size rule.
• Add test for invalid values in Sorted rule.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.13 :tada:

Comparison is base (8f545c1) 94.61% compared to head (64ae77e) 94.74%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1412 +/- ## ============================================ + Coverage 94.61% 94.74% +0.13% Complexity 973 973 ============================================ Files 195 195 Lines 2285 2285 ============================================ + Hits 2162 2165 +3 + Misses 123 120 -3 ``` [see 3 files with indirect coverage changes](https://codecov.io/gh/Respect/Validation/pull/1412/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Respect) Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Respect). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Respect)

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[dcorrea777]

I don't know if the message pattern is correct, but I can change it if necessary.

[alganet]

Looks good to me! Thanks for your contribution 🐼