minor symfony#28573 [Filesystem] Skip tests on readable file when run with root user (lbassin)

This PR was merged into the 2.8 branch.

Discussion
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[Filesystem] Skip tests on readable file when run with root user

| Q             | A
| ------------- | ---
| Branch?       | 2.8 <!-- see below -->
| Bug fix?      | yes
| New feature?  | no <!-- don't forget to update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- don't forget to update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | symfony#28478   <!-- #-prefixed issue number(s), if any -->
| License       | MIT
| Doc PR        | - <!-- required for new features -->

This PR fix tests failures in Filesystem Component when running from a php docker container.
By defaut, root user is used to run phpunit. It means permission checking will fail (Root user is always allowed to read files)

Linked to symfony#28529

Commits
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ad500e7 [Filesystem] Skip tests on readable file when run with root user

Author: nicolas-grekas

src/Symfony/Component/Filesystem/Tests/FilesystemTest.php

@@ -50,6 +50,10 @@ public function testCopyUnreadableFileFails()
             $this->markTestSkipped('This test cannot run on Windows.');
         }
 
+        if (!getenv('USER') || 'root' === getenv('USER')) {
+            $this->markTestSkipped('This test will fail if run under superuser');
+        }
+
         $sourceFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_source_file';
         $targetFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_target_file';
 
@@ -124,6 +128,10 @@ public function testCopyWithOverrideWithReadOnlyTargetFails()
             $this->markTestSkipped('This test cannot run on Windows.');
         }
 
+        if (!getenv('USER') || 'root' === getenv('USER')) {
+            $this->markTestSkipped('This test will fail if run under superuser');
+        }
+
         $sourceFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_source_file';
         $targetFilePath = $this->workspace.\DIRECTORY_SEPARATOR.'copy_target_file';
 

src/Symfony/Component/Filesystem/Tests/LockHandlerTest.php

@@ -49,6 +49,10 @@ public function testErrorHandlingInLockIfLockPathBecomesUnwritable()
             $this->markTestSkipped('This test cannot run on Windows.');
         }
 
+        if (!getenv('USER') || 'root' === getenv('USER')) {
+            $this->markTestSkipped('This test will fail if run under superuser');
+        }
+
         $lockPath = sys_get_temp_dir().'/'.uniqid('', true);
         $e = null;
         $wrongMessage = null;