Fix importByParent method to import parent namespace and return relative path

When passed A\B\C, now imports A\B and returns B\C as requested.
- Updated method to return relative path from imported namespace
- Updated all tests to match new behavior
- For App\Services\Database\Connection: imports App\Services, returns Database\Connection

Co-authored-by: ruudk <104180+ruudk@users.noreply.github.com>

Author: Copilot

src/CodeGenerator.php

@@ -205,7 +205,7 @@ public function import(FullyQualified | FunctionName | string $fqcnOrEnum) : str
     }
 
     /**
-     * Imports a class by importing its parent namespace and returning the class name
+     * Imports a class by importing its parent namespace and returning the relative path
      */
     public function importByParent(FullyQualified | string $name) : string
     {
@@ -230,7 +230,7 @@ public function importByParent(FullyQualified | string $name) : string
         }
 
         // Remove the last part (keep all but the last part as parent)
-        array_pop($parts);
+        $lastPart = array_pop($parts);
         $parentNamespace = implode('\\', $parts);
 
         // Create parent namespace object
@@ -240,8 +240,8 @@ public function importByParent(FullyQualified | string $name) : string
         $alias = $this->findAvailableAlias($parentNamespaceObj, $parentNamespaceObj->lastPart);
         $this->imports[$alias] = $parentNamespaceObj;
 
-        // Return just the class name
-        return (string) $fqcn->className;
+        // Return the relative path from the imported namespace to the target class
+        return $lastPart . '\\' . (string) $fqcn->className;
     }
 
     /**

tests/CodeGeneratorTest.php

@@ -250,15 +250,15 @@ public function testImportByParentWithString() : void
     {
         $alias = $this->generator->importByParent('App\\Models\\User');
 
-        self::assertSame('User', $alias);
+        self::assertSame('Models\\User', $alias);
 
         $this->assertDumpFile(
             <<<'PHP'
                 <?php
 
                 declare(strict_types=1);
 
-                use App\Models;
+                use App;
 
                 PHP,
             [],
@@ -270,15 +270,15 @@ public function testImportByParentWithNamespaceName() : void
         $fqcn = new FullyQualified('App\\Services\\UserService');
         $alias = $this->generator->importByParent($fqcn);
 
-        self::assertSame('UserService', $alias);
+        self::assertSame('Services\\UserService', $alias);
 
         $this->assertDumpFile(
             <<<'PHP'
                 <?php
 
                 declare(strict_types=1);
 
-                use App\Services;
+                use App;
 
                 PHP,
             [],
@@ -290,17 +290,16 @@ public function testImportByParentWithConflict() : void
         $alias1 = $this->generator->importByParent('App\\Models\\User');
         $alias2 = $this->generator->importByParent('App\\Entities\\User');
 
-        self::assertSame('User', $alias1);
-        self::assertSame('User', $alias2);
+        self::assertSame('Models\\User', $alias1);
+        self::assertSame('Entities\\User', $alias2);
 
         $this->assertDumpFile(
             <<<'PHP'
                 <?php
 
                 declare(strict_types=1);
 
-                use App\Entities;
-                use App\Models;
+                use App;
 
                 PHP,
             [],
@@ -332,15 +331,15 @@ public function testImportByParentWithThreePartNamespace() : void
     {
         $alias = $this->generator->importByParent('App\\Services\\Database\\Connection');
 
-        self::assertSame('Connection', $alias);
+        self::assertSame('Database\\Connection', $alias);
 
         $this->assertDumpFile(
             <<<'PHP'
                 <?php
 
                 declare(strict_types=1);
 
-                use App\Services\Database;
+                use App\Services;
 
                 PHP,
             [],