Index: tests/phpunit/tests/media.php
===================================================================
--- tests/phpunit/tests/media.php	(revision 41594)
+++ tests/phpunit/tests/media.php	(working copy)
@@ -20,6 +20,11 @@
 		$GLOBALS['_wp_additional_image_sizes'] = self::$_sizes;
 	}
 
+	public static function tearDownAfterClass() {
+		wp_delete_post( self::$large_id, true );
+		parent::tearDownAfterClass();
+	}
+
 	function setUp() {
 		parent::setUp();
 		$this->caption = 'A simple caption.';
Index: tests/phpunit/tests/post/thumbnails.php
===================================================================
--- tests/phpunit/tests/post/thumbnails.php	(revision 41594)
+++ tests/phpunit/tests/post/thumbnails.php	(working copy)
@@ -22,6 +22,11 @@
 		) );
 	}
 
+	public static function tearDownAfterClass() {
+		wp_delete_post( self::$attachment_id, true );
+		parent::tearDownAfterClass();
+	}
+
 	function test_has_post_thumbnail() {
 		$this->assertFalse( has_post_thumbnail( self::$post ) );
 		$this->assertFalse( has_post_thumbnail( self::$post->ID ) );