Fix path resolving relative to a root directory

CHANGELOG.md

@@ -5,6 +5,7 @@
 ### Fixed
 
 - Some relative paths were parsed as absolute ones
+- Resolving a relative path from a root path returned an invalid path (as it started with 2 `/`)
 
 ## 5.2.0 - 2026-03-17
 

src/Path.php

@@ -121,6 +121,10 @@ final public function resolve(self $path): self
 
         $parent = \dirname($this->toString());
 
+        if ($parent === '/') {
+            return self::of('/'.$path->toString());
+        }
+
         return self::of($parent.'/'.$path->toString());
     }
 

tests/PathTest.php

@@ -98,6 +98,18 @@ public function testAbsolutePathsAlwaysStartWithASlash(): BlackBox\Proof
             });
     }
 
+    public function testResolveAbsolutility(): BlackBox\Proof
+    {
+        return $this
+            ->forAll(FPath::any(), FPath::any())
+            ->prove(function($a, $b) {
+                $this->assertSame(
+                    $a->absolute() || $b->absolute(),
+                    $a->resolve($b)->absolute(),
+                );
+            });
+    }
+
     public static function resolutions(): array
     {
         return [
@@ -126,6 +138,11 @@ public static function resolutions(): array
                 'some/source',
                 'some/target',
             ],
+            'relative to the root' => [
+                '/target',
+                '/source',
+                'target',
+            ],
         ];
     }
 }