diff --git a/tests/phpunit/tests/link/getPostCommentsFeedLink.php b/tests/phpunit/tests/link/getPostCommentsFeedLink.php
index ff424cbc18..824a58c7d1 100644
--- a/tests/phpunit/tests/link/getPostCommentsFeedLink.php
+++ b/tests/phpunit/tests/link/getPostCommentsFeedLink.php
@@ -3,12 +3,38 @@
  * @group link
  */
 class Tests_Link_GetPostCommentsFeedLink extends WP_UnitTestCase {
-	public function test_post_link() {
+	private static $rewrite;
+	private static $permalink_structure;
+
+	static function setUpBeforeClass() {
 		global $wp_rewrite;
-		$permalink_structure = get_option( 'permalink_structure' );
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '' );
-		$wp_rewrite->flush_rules();
+
+		parent::setUpBeforeClass();
+
+		self::$rewrite = $wp_rewrite;
+		self::$permalink_structure = get_option( 'permalink_structure' );
+	}
+
+	public static function tearDownAfterClass() {
+		parent::tearDownAfterClass();
+
+		self::$rewrite->init();
+		self::$rewrite->set_permalink_structure( self::$permalink_structure );
+		self::$rewrite->flush_rules();
+	}
+
+	public function setUp() {
+		parent::setUp();
+		self::$rewrite->init();
+	}
+
+	private function set_permalink_structure( $structure ) {
+		self::$rewrite->set_permalink_structure( $structure );
+		self::$rewrite->flush_rules();
+	}
+
+	public function test_post_link() {
+		$this->set_permalink_structure( '' );
 
 		$post_id = $this->factory->post->create();
 
@@ -22,11 +48,7 @@ class Tests_Link_GetPostCommentsFeedLink extends WP_UnitTestCase {
 	}
 
 	public function test_post_pretty_link() {
-		global $wp_rewrite;
-		$permalink_structure = get_option( 'permalink_structure' );
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 
 		$post_id = $this->factory->post->create();
 
@@ -37,10 +59,7 @@ class Tests_Link_GetPostCommentsFeedLink extends WP_UnitTestCase {
 	}
 
 	public function test_attachment_link() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '' );
 
 		$post_id = $this->factory->post->create();
 		$attachment_id = $this->factory->attachment->create_object( 'image.jpg', $post_id, array(
@@ -58,10 +77,7 @@ class Tests_Link_GetPostCommentsFeedLink extends WP_UnitTestCase {
 	}
 
 	public function test_attachment_pretty_link() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 
 		$post_id = $this->factory->post->create( array(
 			'post_status' => 'publish'
@@ -81,10 +97,7 @@ class Tests_Link_GetPostCommentsFeedLink extends WP_UnitTestCase {
 	}
 
 	public function test_attachment_no_name_pretty_link() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 
 		$post_id = $this->factory->post->create();
 		$attachment_id = $this->factory->attachment->create_object( 'image.jpg', $post_id, array(
@@ -94,15 +107,12 @@ class Tests_Link_GetPostCommentsFeedLink extends WP_UnitTestCase {
 
 		$link = get_post_comments_feed_link( $attachment_id );
 		$expected = get_permalink( $post_id ) . 'attachment/' . $attachment_id . '/feed/';
-		
+
 		$this->assertEquals( $expected, $link );
 	}
 
 	public function test_unattached_link() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '' );
 
 		$attachment_id = $this->factory->attachment->create_object( 'image.jpg', 0, array(
 			'post_mime_type' => 'image/jpeg',
@@ -119,10 +129,7 @@ class Tests_Link_GetPostCommentsFeedLink extends WP_UnitTestCase {
 	}
 
 	public function test_unattached_pretty_link() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 
 		$attachment_id = $this->factory->attachment->create_object( 'image.jpg', 0, array(
 			'post_mime_type' => 'image/jpeg',