Canonicalize source filter paths to resolve relative segments

When phpunit.xml is in a subdirectory and uses relative paths with ".." (e.g. ../src/), the path was passed to the file filter without canonicalization, causing the generated regex to include literal ".." segments that never match resolved file paths.
Apply realpath() in FileFilterMapper to normalize directory and file paths before building the filter.

Author: sebastianbergmann

src/TextUI/Configuration/FileFilterMapper.php

@@ -9,6 +9,7 @@
  */
 namespace PHPUnit\TextUI\Configuration;
 
+use function realpath;
 use SebastianBergmann\FileFilter\Builder as FilterBuilder;
 use SebastianBergmann\FileFilter\Filter as FileFilter;
 
@@ -37,8 +38,10 @@ private function directories(FilterDirectoryCollection $directories): array
         $result = [];
 
         foreach ($directories as $directory) {
+            $path = realpath($directory->path());
+
             $result[] = [
-                'path'   => $directory->path(),
+                'path'   => $path !== false ? $path : $directory->path(),
                 'prefix' => $directory->prefix(),
                 'suffix' => $directory->suffix(),
             ];
@@ -55,7 +58,9 @@ private function files(FilterFileCollection $files): array
         $result = [];
 
         foreach ($files as $file) {
-            $result[] = $file->path();
+            $path = realpath($file->path());
+
+            $result[] = $path !== false ? $path : $file->path();
         }
 
         return $result;

tests/unit/TextUI/SourceFilterTest.php

@@ -514,6 +514,62 @@ public static function provider(): array
                     ),
                 ),
             ],
+            'file included using directory with non-canonical path' => [
+                [
+                    self::fixturePath('a/PrefixSuffix.php') => true,
+                ],
+                self::createSource(
+                    includeDirectories: FilterDirectoryCollection::fromArray(
+                        [
+                            new FilterDirectory(self::fixturePath('/b/../a'), '', '.php'),
+                        ],
+                    ),
+                ),
+            ],
+            'file included using file with non-canonical path' => [
+                [
+                    self::fixturePath('a/PrefixSuffix.php') => true,
+                ],
+                self::createSource(includeFiles: FilterFileCollection::fromArray(
+                    [
+                        new FilterFile(self::fixturePath('/b/../a/PrefixSuffix.php')),
+                    ],
+                )),
+            ],
+            'file excluded using directory with non-canonical path' => [
+                [
+                    self::fixturePath('a/PrefixSuffix.php') => false,
+                ],
+                self::createSource(
+                    includeDirectories: FilterDirectoryCollection::fromArray(
+                        [
+                            new FilterDirectory(self::fixturePath(), '', '.php'),
+                        ],
+                    ),
+                    excludeDirectories: FilterDirectoryCollection::fromArray(
+                        [
+                            new FilterDirectory(self::fixturePath('/b/../a'), '', '.php'),
+                        ],
+                    ),
+                ),
+            ],
+            'file excluded using file with non-canonical path' => [
+                [
+                    self::fixturePath('a/PrefixSuffix.php') => false,
+                ],
+                self::createSource(
+                    includeDirectories: FilterDirectoryCollection::fromArray(
+                        [
+                            new FilterDirectory(self::fixturePath(), '', '.php'),
+                        ],
+                    ),
+                    excludeFiles: FilterFileCollection::fromArray(
+                        [
+                            new FilterFile(self::fixturePath('/b/../a/PrefixSuffix.php')),
+                        ],
+                    ),
+                ),
+            ],
             'files included using same directory and different prefixes' => [
                 [
                     self::fixturePath('a/c/Suffix.php')              => true,