destroy() now also frees memory of backup

src/Intervention/Image/Gd/Commands/DestroyCommand.php

@@ -12,6 +12,14 @@ class DestroyCommand extends \Intervention\Image\Commands\AbstractCommand
      */
     public function execute($image)
     {
-        return imagedestroy($image->getCore());
+        // destroy image core
+        imagedestroy($image->getCore());
+
+        // destroy backups    
+        foreach ($image->getBackups() as $backup) {
+            imagedestroy($backup);
+        }
+
+        return true;
     }
 }

src/Intervention/Image/Imagick/Commands/DestroyCommand.php

@@ -12,6 +12,14 @@ class DestroyCommand extends \Intervention\Image\Commands\AbstractCommand
      */
     public function execute($image)
     {
-        return $image->getCore()->clear();
+        // destroy image core
+        $image->getCore()->clear();
+
+        // destroy backups    
+        foreach ($image->getBackups() as $backup) {
+            $backup->clear();
+        }
+
+        return true;
     }
 }

tests/DestroyCommandTest.php

@@ -12,9 +12,15 @@ class DestroyCommandTest extends PHPUnit_Framework_TestCase
     
     public function testGd()
     {
-        $resource = imagecreatefromjpeg(__DIR__.'/images/test.jpg');
+        $resource = imagecreatefrompng(__DIR__.'/images/tile.png');
+        $backups = array(
+            imagecreatefrompng(__DIR__.'/images/tile.png'), 
+            imagecreatefrompng(__DIR__.'/images/tile.png')
+        );
+
         $image = Mockery::mock('Intervention\Image\Image');
         $image->shouldReceive('getCore')->once()->andReturn($resource);
+        $image->shouldReceive('getBackups')->once()->andReturn($backups);
         $command = new DestroyGd(array());
         $result = $command->execute($image);
         $this->assertTrue($result);
@@ -24,8 +30,14 @@ class DestroyCommandTest extends PHPUnit_Framework_TestCase
     {
         $imagick = Mockery::mock('Imagick');
         $imagick->shouldReceive('clear')->with()->andReturn(true);
+
+        $backup = Mockery::mock('Imagick');
+        $backup->shouldReceive('clear')->with()->andReturn(true);
+        $backups = array($backup);
+
         $image = Mockery::mock('Intervention\Image\Image');
         $image->shouldReceive('getCore')->once()->andReturn($imagick);
+        $image->shouldReceive('getBackups')->once()->andReturn($backups);
         $command = new DestroyImagick(array());
         $result = $command->execute($image);
         $this->assertTrue($result);

tests/GdSystemTest.php

@@ -1562,8 +1562,12 @@ class GdSystemTest extends PHPUnit_Framework_TestCase
     public function testDestroy()
     {
         $img = $this->manager()->make('tests/images/trim.png');
+        $img->backup();
         $img->destroy();
+        // destroy should affect core
         $this->assertEquals(get_resource_type($img->getCore()), 'Unknown');
+        // destroy should affect backup
+        $this->assertEquals(get_resource_type($img->getBackup()), 'Unknown');
     }
 
     public function testStringConversion()

tests/ImagickSystemTest.php

@@ -1555,6 +1555,17 @@ class ImagickSystemTest extends PHPUnit_Framework_TestCase
         $img->getCore()->getImageWidth(); // try to get width (should throw exception)
     }
 
+    /**
+     * @expectedException Exception
+     */
+    public function testDestroyWithBackup()
+    {
+        $img = $this->manager()->make('tests/images/trim.png');
+        $img->backup();
+        $img->destroy();
+        $img->getBackup()->getImageWidth(); // try to get width (should throw exception)
+    }
+
     public function testStringConversion()
     {
         $img = $this->manager()->make('tests/images/trim.png');