UriValidator file: tests/fix(es) (#858)

## Description

Update tests (and code to follow) for UriValidator `file:` protocol.

## Related Issue

#856

## Type of Change

<!-- Mark the appropriate option with an "x" -->

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] Documentation update
- [ ] Code refactoring
- [ ] Other (please describe):

## Checklist

<!-- Mark completed items with an "x" -->

- [x] I have read the [CONTRIBUTING](CONTRIBUTING.md) guidelines
- [x] My code follows the code style of this project
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] All new and existing tests pass
- [x] I have updated the documentation accordingly
- [x] My changes generate no new warnings

## Additional Notes

<!-- Add any additional information that might be helpful for reviewers
-->

Author: alcohol

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 ### Changed
 - ci: Run workflows against 5.x.x branches ([#859](https://github.com/jsonrainbow/json-schema/pull/859))
+### Fixed
+- UriValidator: Allow `file:/` and `file:///` ([#856](https://github.com/jsonrainbow/json-schema/discussions/856))
 
 ## [6.6.3] - 2025-12-02
 ### Changed

src/JsonSchema/Tool/Validator/UriValidator.php

@@ -21,7 +21,7 @@ public static function isValid(string $uri): bool
 
         // RFC 3986: Non-Hierarchical URIs (mailto, data, urn, news)
         $nonHierarchicalPattern = '/^
-                (mailto|data|urn|news|tel):          # Only allow known non-hierarchical schemes
+                (mailto|data|urn|news|tel|file):     # Only allow known non-hierarchical schemes
                 (.+)                                 # Must contain at least one character after scheme
         $/ix';
 

tests/Tool/Validator/UriValidatorTest.php

@@ -34,6 +34,9 @@ public function validUriDataProvider(): \Generator
         yield 'OASIS URN URI' => ['uri' => 'urn:oasis:names:specification:docbook:dtd:xml:4.1.2'];
         yield 'Custom URI with underscore' => ['uri' => 'custom://reg_name/path/file.json'];
         yield 'Custom URI with tilde' => ['uri' => 'custom://reg~name/path/file.json'];
+        yield 'File URI with implicit localhost (empty host)' => ['uri' => 'file:///path/to/file.txt'];
+        yield 'File URI with explicit host' => ['uri' => 'file://some-host/path/to/file.txt'];
+        yield 'File URI without any host' => ['uri' => 'file:/path/to/file.txt'];
     }
 
     public function invalidUriDataProvider(): \Generator