diff --git a/tests/phpunit/tests/post/thumbnails.php b/tests/phpunit/tests/post/thumbnails.php
index cc8f61fa22..39013a602d 100644
--- a/tests/phpunit/tests/post/thumbnails.php
+++ b/tests/phpunit/tests/post/thumbnails.php
@@ -5,62 +5,65 @@
  * @group media
  */
 class Tests_Post_Thumbnail_Template extends WP_UnitTestCase {
-	protected $post;
-	protected $attachment_id;
+	protected static $post;
+	protected static $attachment_id;
 
-	function setUp() {
-		parent::setUp();
-
-		$this->post          = $this->factory->post->create_and_get();
-		$file                = DIR_TESTDATA . '/images/canola.jpg';
-		$this->attachment_id = $this->factory->attachment->create_upload_object( $file, $this->post->ID, array(
+	public static function wpSetUpBeforeClass( $factory ) {
+		self::$post = $factory->post->create_and_get();
+		$file = DIR_TESTDATA . '/images/canola.jpg';
+		self::$attachment_id = $factory->attachment->create_upload_object( $file, self::$post->ID, array(
 			'post_mime_type' => 'image/jpeg',
 		) );
 	}
 
+	public static function wpTearDownAfterClass() {
+		wp_delete_post( self::$post->ID );
+		wp_delete_attachment( self::$attachment_id );
+	}
+
 	function test_has_post_thumbnail() {
-		$this->assertFalse( has_post_thumbnail( $this->post ) );
-		$this->assertFalse( has_post_thumbnail( $this->post->ID ) );
+		$this->assertFalse( has_post_thumbnail( self::$post ) );
+		$this->assertFalse( has_post_thumbnail( self::$post->ID ) );
 		$this->assertFalse( has_post_thumbnail() );
 
-		$GLOBALS['post'] = $this->post;
+		$GLOBALS['post'] = self::$post;
 
 		$this->assertFalse( has_post_thumbnail() );
 
 		unset( $GLOBALS['post'] );
 
-		set_post_thumbnail( $this->post, $this->attachment_id );
+		set_post_thumbnail( self::$post, self::$attachment_id );
 
-		$this->assertTrue( has_post_thumbnail( $this->post ) );
-		$this->assertTrue( has_post_thumbnail( $this->post->ID ) );
+		$this->assertTrue( has_post_thumbnail( self::$post ) );
+		$this->assertTrue( has_post_thumbnail( self::$post->ID ) );
 		$this->assertFalse( has_post_thumbnail() );
 
-		$GLOBALS['post'] = $this->post;
+		$GLOBALS['post'] = self::$post;
 
 		$this->assertTrue( has_post_thumbnail() );
 	}
 
 	function test_get_post_thumbnail_id() {
-		$this->assertEmpty( get_post_thumbnail_id( $this->post ) );
-		$this->assertEmpty( get_post_thumbnail_id( $this->post->ID ) );
+		$this->assertEmpty( get_post_thumbnail_id( self::$post ) );
+		$this->assertEmpty( get_post_thumbnail_id( self::$post->ID ) );
 		$this->assertEmpty( get_post_thumbnail_id() );
 
-		set_post_thumbnail( $this->post, $this->attachment_id );
+		set_post_thumbnail( self::$post, self::$attachment_id );
 
-		$this->assertEquals( $this->attachment_id, get_post_thumbnail_id( $this->post ) );
-		$this->assertEquals( $this->attachment_id, get_post_thumbnail_id( $this->post->ID ) );
+		$this->assertEquals( self::$attachment_id, get_post_thumbnail_id( self::$post ) );
+		$this->assertEquals( self::$attachment_id, get_post_thumbnail_id( self::$post->ID ) );
 
-		$GLOBALS['post'] = $this->post;
+		$GLOBALS['post'] = self::$post;
 
-		$this->assertEquals( $this->attachment_id, get_post_thumbnail_id() );
+		$this->assertEquals( self::$attachment_id, get_post_thumbnail_id() );
 	}
 
 	function test_update_post_thumbnail_cache() {
-		set_post_thumbnail( $this->post, $this->attachment_id );
+		set_post_thumbnail( self::$post, self::$attachment_id );
 
 		$WP_Query = new WP_Query( array(
 			'post_type' => 'any',
-			'post__in'  => array( $this->post->ID ),
+			'post__in'  => array( self::$post->ID ),
 			'orderby'   => 'post__in',
 		) );
 
@@ -73,16 +76,16 @@ class Tests_Post_Thumbnail_Template extends WP_UnitTestCase {
 
 	function test_get_the_post_thumbnail() {
 		$this->assertEquals( '', get_the_post_thumbnail() );
-		$this->assertEquals( '', get_the_post_thumbnail( $this->post ) );
-		set_post_thumbnail( $this->post, $this->attachment_id );
+		$this->assertEquals( '', get_the_post_thumbnail( self::$post ) );
+		set_post_thumbnail( self::$post, self::$attachment_id );
 
-		$expected = wp_get_attachment_image( $this->attachment_id, 'post-thumbnail', false, array(
+		$expected = wp_get_attachment_image( self::$attachment_id, 'post-thumbnail', false, array(
 			'class' => 'attachment-post-thumbnail size-post-thumbnail wp-post-image'
 		) );
 
-		$this->assertEquals( $expected, get_the_post_thumbnail( $this->post ) );
+		$this->assertEquals( $expected, get_the_post_thumbnail( self::$post ) );
 
-		$GLOBALS['post'] = $this->post;
+		$GLOBALS['post'] = self::$post;
 
 		$this->assertEquals( $expected, get_the_post_thumbnail() );
 	}
@@ -94,7 +97,7 @@ class Tests_Post_Thumbnail_Template extends WP_UnitTestCase {
 
 		$this->assertEquals( '', $actual );
 
-		$GLOBALS['post'] = $this->post;
+		$GLOBALS['post'] = self::$post;
 
 		ob_start();
 		the_post_thumbnail();
@@ -102,9 +105,9 @@ class Tests_Post_Thumbnail_Template extends WP_UnitTestCase {
 
 		$this->assertEquals( '', $actual );
 
-		set_post_thumbnail( $this->post, $this->attachment_id );
+		set_post_thumbnail( self::$post, self::$attachment_id );
 
-		$expected = wp_get_attachment_image( $this->attachment_id, 'post-thumbnail', false, array(
+		$expected = wp_get_attachment_image( self::$attachment_id, 'post-thumbnail', false, array(
 			'class' => 'attachment-post-thumbnail size-post-thumbnail wp-post-image'
 		) );
 
@@ -119,41 +122,39 @@ class Tests_Post_Thumbnail_Template extends WP_UnitTestCase {
 	 * @ticket 33070
 	 */
 	function test_get_the_post_thumbnail_url() {
-		$this->assertFalse( has_post_thumbnail( $this->post ) );
+		$this->assertFalse( has_post_thumbnail( self::$post ) );
 		$this->assertFalse( get_the_post_thumbnail_url() );
-		$this->assertFalse( get_the_post_thumbnail_url( $this->post ) );
+		$this->assertFalse( get_the_post_thumbnail_url( self::$post ) );
 
-		set_post_thumbnail( $this->post, $this->attachment_id );
+		set_post_thumbnail( self::$post, self::$attachment_id );
 
 		$this->assertFalse( get_the_post_thumbnail_url() );
-		$this->assertEquals( wp_get_attachment_url( $this->attachment_id ), get_the_post_thumbnail_url( $this->post ) );
+		$this->assertEquals( wp_get_attachment_url( self::$attachment_id ), get_the_post_thumbnail_url( self::$post ) );
 
-		$GLOBALS['post'] = $this->post;
+		$GLOBALS['post'] = self::$post;
 
-		$this->assertEquals( wp_get_attachment_url( $this->attachment_id ), get_the_post_thumbnail_url() );
+		$this->assertEquals( wp_get_attachment_url( self::$attachment_id ), get_the_post_thumbnail_url() );
 	}
 
 	/**
 	 * @ticket 33070
 	 */
 	function test_get_the_post_thumbnail_url_with_invalid_post() {
-		$post = $this->factory->post->create_and_get();
+		set_post_thumbnail( self::$post, self::$attachment_id );
 
-		set_post_thumbnail( $post, $this->attachment_id );
+		$this->assertTrue( false !== get_the_post_thumbnail_url( self::$post->ID ) );
 
-		$this->assertTrue( false !== get_the_post_thumbnail_url( $post->ID ) );
-
-		$deleted = wp_delete_post( $post->ID, true );
+		$deleted = wp_delete_post( self::$post->ID, true );
 		$this->assertNotEmpty( $deleted );
 
-		$this->assertFalse( get_the_post_thumbnail_url( $post->ID ) );
+		$this->assertFalse( get_the_post_thumbnail_url( self::$post->ID ) );
 	}
 
 	/**
 	 * @ticket 33070
 	 */
 	function test_the_post_thumbnail_url() {
-		$GLOBALS['post'] = $this->post;
+		$GLOBALS['post'] = self::$post;
 
 		ob_start();
 		the_post_thumbnail_url();
@@ -167,12 +168,12 @@ class Tests_Post_Thumbnail_Template extends WP_UnitTestCase {
 
 		$this->assertEmpty( $actual );
 
-		set_post_thumbnail( $this->post, $this->attachment_id );
+		set_post_thumbnail( self::$post, self::$attachment_id );
 
 		ob_start();
 		the_post_thumbnail_url();
 		$actual = ob_get_clean();
 
-		$this->assertEquals( wp_get_attachment_url( $this->attachment_id ), $actual );
+		$this->assertEquals( wp_get_attachment_url( self::$attachment_id ), $actual );
 	}
 }