diff --git a/tests/phpunit/includes/testcase.php b/tests/phpunit/includes/testcase.php
index 17631bbb2f..8ced19744f 100644
--- a/tests/phpunit/includes/testcase.php
+++ b/tests/phpunit/includes/testcase.php
@@ -50,7 +50,7 @@ class WP_UnitTestCase extends PHPUnit_Framework_TestCase {
 			$this->reset_post_types();
 			$this->reset_taxonomies();
 			$this->reset_post_statuses();
-			$this->reset_permalinks();
+			$this->set_permalink_structure();
 		}
 
 		$this->start_transaction();
@@ -653,12 +653,14 @@ class WP_UnitTestCase extends PHPUnit_Framework_TestCase {
 	 * @since 4.4.0
 	 *
 	 * @global WP_Rewrite $wp_rewrite
+	 *
+	 * @param string $structure Optional. Permalink structure to set. Default empty.
 	 */
-	public function reset_permalinks() {
+	public function set_permalink_structure( $structure = '' ) {
 		global $wp_rewrite;
 
 		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '' );
+		$wp_rewrite->set_permalink_structure( $structure );
 		$wp_rewrite->flush_rules();
 	}
 }
diff --git a/tests/phpunit/tests/admin/includesPost.php b/tests/phpunit/tests/admin/includesPost.php
index 56156acee9..aabc69fc55 100644
--- a/tests/phpunit/tests/admin/includesPost.php
+++ b/tests/phpunit/tests/admin/includesPost.php
@@ -251,11 +251,8 @@ class Tests_Admin_includesPost extends WP_UnitTestCase {
 	 * @ticket 30910
 	 */
 	public function test_get_sample_permalink_should_return_pretty_permalink_for_posts_with_post_status_future() {
-		global $wp_rewrite;
-
 		$permalink_structure = '%postname%';
-		$wp_rewrite->set_permalink_structure( "/$permalink_structure/" );
-		flush_rewrite_rules();
+		$this->set_permalink_structure( "/$permalink_structure/" );
 
 		$future_date = date( 'Y-m-d H:i:s', time() + 100 );
 		$p = $this->factory->post->create( array( 'post_status' => 'future', 'post_name' => 'foo', 'post_date' => $future_date ) );
@@ -285,10 +282,7 @@ class Tests_Admin_includesPost extends WP_UnitTestCase {
 	 * @ticket 18306
 	 */
 	public function test_get_sample_permalink_html_should_use_pretty_permalink_for_view_post_link_when_pretty_permalinks_are_enabled() {
-		global $wp_rewrite;
-		$permalink_structure = '%postname%';
-		$wp_rewrite->set_permalink_structure( "/$permalink_structure/" );
-		flush_rewrite_rules();
+		$this->set_permalink_structure( '/%postname%/' );
 
 		wp_set_current_user( $this->factory->user->create( array( 'role' => 'administrator' ) ) );
 
@@ -305,10 +299,7 @@ class Tests_Admin_includesPost extends WP_UnitTestCase {
 	 * @ticket 18306
 	 */
 	public function test_get_sample_permalink_html_should_use_correct_permalink_for_view_post_link_when_changing_slug() {
-		global $wp_rewrite;
-		$permalink_structure = '%postname%';
-		$wp_rewrite->set_permalink_structure( "/$permalink_structure/" );
-		flush_rewrite_rules();
+		$this->set_permalink_structure( '/%postname%/' );
 
 		wp_set_current_user( $this->factory->user->create( array( 'role' => 'administrator' ) ) );
 
@@ -346,10 +337,7 @@ class Tests_Admin_includesPost extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_get_sample_permalink_should_avoid_slugs_that_would_create_clashes_with_year_archives() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_name' => '2015',
@@ -363,10 +351,7 @@ class Tests_Admin_includesPost extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_get_sample_permalink_should_allow_yearlike_slugs_if_permastruct_does_not_cause_an_archive_conflict() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_name' => '2015',
@@ -380,10 +365,7 @@ class Tests_Admin_includesPost extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_get_sample_permalink_should_avoid_slugs_that_would_create_clashes_with_month_archives() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_name' => '11',
@@ -397,10 +379,7 @@ class Tests_Admin_includesPost extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_get_sample_permalink_should_ignore_potential_month_conflicts_for_invalid_monthnum() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_name' => '13',
@@ -414,10 +393,7 @@ class Tests_Admin_includesPost extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_get_sample_permalink_should_avoid_slugs_that_would_create_clashes_with_day_archives() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_name' => '30',
@@ -431,10 +407,7 @@ class Tests_Admin_includesPost extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_get_sample_permalink_should_iterate_slug_suffix_when_a_date_conflict_is_found() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
 
 		$this->factory->post->create( array(
 			'post_name' => '30-2',
@@ -452,10 +425,7 @@ class Tests_Admin_includesPost extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_get_sample_permalink_should_ignore_potential_day_conflicts_for_invalid_day() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_name' => '32',
@@ -469,10 +439,7 @@ class Tests_Admin_includesPost extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_get_sample_permalink_should_allow_daylike_slugs_if_permastruct_does_not_cause_an_archive_conflict() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%month%/%day%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%month%/%day%/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_name' => '30',
diff --git a/tests/phpunit/tests/link.php b/tests/phpunit/tests/link.php
index 436fddd89d..777347b702 100644
--- a/tests/phpunit/tests/link.php
+++ b/tests/phpunit/tests/link.php
@@ -20,9 +20,7 @@ class Tests_Link extends WP_UnitTestCase {
 	function test_get_pagenum_link_case_insensitivity() {
 		$old_req_uri = $_SERVER['REQUEST_URI'];
 
-		global $wp_rewrite;
-		$wp_rewrite->set_permalink_structure('/%year%/%monthnum%/%day%/%postname%/');
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 
 		add_filter( 'home_url', array( $this, '_get_pagenum_link_cb' ) );
 		$_SERVER['REQUEST_URI'] = '/woohoo';
@@ -35,8 +33,6 @@ class Tests_Link extends WP_UnitTestCase {
 	}
 
 	function test_wp_get_shortlink() {
-		global $wp_rewrite;
-
 		$post_id = $this->factory->post->create();
 		$post_id2 = $this->factory->post->create();
 
@@ -67,8 +63,7 @@ class Tests_Link extends WP_UnitTestCase {
 		$this->assertEquals( '', wp_get_shortlink( 0 ) );
 		$this->assertEquals( '', wp_get_shortlink() );
 
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 
 		// With a permalink structure set, get_permalink() will no longer match.
 		$this->assertNotEquals( get_permalink( $post_id ), wp_get_shortlink( $post_id, 'post' ) );
@@ -88,9 +83,7 @@ class Tests_Link extends WP_UnitTestCase {
 		// Don't test against get_permalink() since it uses ?page_id= for pages.
 		$this->assertEquals( home_url( '?p=' . $post_id ), wp_get_shortlink( $post_id, 'post' ) );
 
-		global $wp_rewrite;
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 
 		$this->assertEquals( home_url( '?p=' . $post_id ), wp_get_shortlink( $post_id, 'post' ) );
 	}
@@ -105,10 +98,7 @@ class Tests_Link extends WP_UnitTestCase {
 
 		$this->assertEquals( home_url( '/' ), wp_get_shortlink( $post_id, 'post' ) );
 
-		global $wp_rewrite;
-		$wp_rewrite->permalink_structure = '';
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 
 		$this->assertEquals( home_url( '/' ), wp_get_shortlink( $post_id, 'post' ) );
 	}
@@ -396,9 +386,7 @@ class Tests_Link extends WP_UnitTestCase {
 	 * @ticket 1914
 	 */
 	public function test_unattached_attachment_has_a_pretty_permalink() {
-		global $wp_rewrite;
-		$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',
@@ -416,12 +404,13 @@ class Tests_Link extends WP_UnitTestCase {
 	 * @ticket 1914
 	 */
 	public function test_attachment_attached_to_non_existent_post_type_has_a_pretty_permalink() {
-		global $wp_rewrite, $wp_post_types;
-		$wp_rewrite->set_permalink_structure('/%year%/%monthnum%/%day%/%postname%/');
+		global $wp_post_types;
+
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 
 		register_post_type( 'not_a_post_type', array( 'public' => true ) );
 
-		$wp_rewrite->flush_rules();
+		flush_rewrite_rules();
 
 		$post_id = $this->factory->post->create( array( 'post_type' => 'not_a_post_type' ) );
 
diff --git a/tests/phpunit/tests/link/getPostCommentsFeedLink.php b/tests/phpunit/tests/link/getPostCommentsFeedLink.php
index 094d70787d..b2474d8e00 100644
--- a/tests/phpunit/tests/link/getPostCommentsFeedLink.php
+++ b/tests/phpunit/tests/link/getPostCommentsFeedLink.php
@@ -17,10 +17,7 @@ class Tests_Link_GetPostCommentsFeedLink extends WP_UnitTestCase {
 	}
 
 	public function test_post_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();
 
@@ -47,10 +44,7 @@ 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'
@@ -70,10 +64,7 @@ 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(
@@ -103,10 +94,7 @@ 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',
diff --git a/tests/phpunit/tests/post.php b/tests/phpunit/tests/post.php
index 614f30586c..98fea84ec5 100644
--- a/tests/phpunit/tests/post.php
+++ b/tests/phpunit/tests/post.php
@@ -415,10 +415,7 @@ class Tests_Post extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_wp_insert_post_should_not_allow_a_bare_numeric_slug_that_might_conflict_with_a_date_archive_when_generating_from_an_empty_post_title() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%postname%/' );
 
 		$p = wp_insert_post( array(
 			'post_title' => '',
@@ -429,7 +426,7 @@ class Tests_Post extends WP_UnitTestCase {
 
 		$post = get_post( $p );
 
-		$this->reset_permalinks();
+		$this->set_permalink_structure();
 
 		$this->assertEquals( "$p-2", $post->post_name );
 	}
@@ -505,10 +502,7 @@ class Tests_Post extends WP_UnitTestCase {
 		// bug: permalink doesn't work if post title is empty
 		// might only fail if the post ID is greater than four characters
 
-		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 = array(
 			'post_author' => $this->author_id,
diff --git a/tests/phpunit/tests/post/wpUniquePostSlug.php b/tests/phpunit/tests/post/wpUniquePostSlug.php
index 7d7755b346..2aaf1ba1d2 100644
--- a/tests/phpunit/tests/post/wpUniquePostSlug.php
+++ b/tests/phpunit/tests/post/wpUniquePostSlug.php
@@ -169,10 +169,7 @@ class Tests_Post_WpUniquePostSlug extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_slugs_resulting_in_permalinks_that_resemble_year_archives_should_be_suffixed() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_type' => 'post',
@@ -187,10 +184,7 @@ class Tests_Post_WpUniquePostSlug extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_slugs_resulting_in_permalinks_that_resemble_year_archives_should_not_be_suffixed_for_already_published_posts() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_type' => 'post',
@@ -206,10 +200,7 @@ class Tests_Post_WpUniquePostSlug extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_yearlike_slugs_should_not_be_suffixed_if_permalink_structure_does_not_result_in_a_clash_with_year_archives() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_type' => 'post',
@@ -224,10 +215,7 @@ class Tests_Post_WpUniquePostSlug extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_slugs_resulting_in_permalinks_that_resemble_month_archives_should_be_suffixed() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_type' => 'post',
@@ -242,10 +230,7 @@ class Tests_Post_WpUniquePostSlug extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_monthlike_slugs_should_not_be_suffixed_if_permalink_structure_does_not_result_in_a_clash_with_month_archives() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/foo/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/foo/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_type' => 'post',
@@ -260,10 +245,7 @@ class Tests_Post_WpUniquePostSlug extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_monthlike_slugs_should_not_be_suffixed_for_invalid_month_numbers() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_type' => 'post',
@@ -278,10 +260,7 @@ class Tests_Post_WpUniquePostSlug extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_slugs_resulting_in_permalinks_that_resemble_day_archives_should_be_suffixed() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_type' => 'post',
@@ -296,10 +275,7 @@ class Tests_Post_WpUniquePostSlug extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_daylike_slugs_should_not_be_suffixed_if_permalink_structure_does_not_result_in_a_clash_with_day_archives() {
-		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%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_type' => 'post',
@@ -314,10 +290,7 @@ class Tests_Post_WpUniquePostSlug extends WP_UnitTestCase {
 	 * @ticket 5305
 	 */
 	public function test_daylike_slugs_should_not_be_suffixed_for_invalid_day_numbers() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
 
 		$p = $this->factory->post->create( array(
 			'post_type' => 'post',
diff --git a/tests/phpunit/tests/query.php b/tests/phpunit/tests/query.php
index a7c20a9d2b..ed2b459448 100644
--- a/tests/phpunit/tests/query.php
+++ b/tests/phpunit/tests/query.php
@@ -3,15 +3,10 @@
 class Tests_Query extends WP_UnitTestCase {
 
 	function setUp() {
-		global $wp_rewrite;
 		parent::setUp();
 
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
-
 		create_initial_taxonomies();
-
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 	}
 
 	/**
diff --git a/tests/phpunit/tests/query/conditionals.php b/tests/phpunit/tests/query/conditionals.php
index 3c273884c0..4c91ecf466 100644
--- a/tests/phpunit/tests/query/conditionals.php
+++ b/tests/phpunit/tests/query/conditionals.php
@@ -22,14 +22,9 @@ class Tests_Query_Conditionals extends WP_UnitTestCase {
 		update_option( 'comments_per_page', 5 );
 		update_option( 'posts_per_page', 5 );
 
-		global $wp_rewrite;
-
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
-
 		create_initial_taxonomies();
 
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 	}
 
 	function tearDown() {
diff --git a/tests/phpunit/tests/query/isTerm.php b/tests/phpunit/tests/query/isTerm.php
index ec93ce6f49..99055fa351 100644
--- a/tests/phpunit/tests/query/isTerm.php
+++ b/tests/phpunit/tests/query/isTerm.php
@@ -23,7 +23,6 @@ class Tests_Query_IsTerm extends WP_UnitTestCase {
 	protected $tax;
 
 	function setUp() {
-		global $wp_rewrite;
 		parent::setUp();
 
 		set_current_screen( 'front' );
@@ -31,13 +30,12 @@ class Tests_Query_IsTerm extends WP_UnitTestCase {
 		$GLOBALS['wp_the_query'] = new WP_Query();
 		$GLOBALS['wp_query'] = $GLOBALS['wp_the_query'];
 
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 
 		create_initial_taxonomies();
 		register_taxonomy( 'testtax', 'post', array( 'public' => true ) );
 
-		$wp_rewrite->flush_rules();
+		flush_rewrite_rules();
 
 		$this->tag_id = $this->factory->tag->create( array( 'slug' => 'tag-slug' ) );
 		$this->cat_id = $this->factory->category->create( array( 'slug' => 'cat-slug' ) );
diff --git a/tests/phpunit/tests/query/verboseRewriteRules.php b/tests/phpunit/tests/query/verboseRewriteRules.php
index ae71dfa1ca..90d29b253e 100644
--- a/tests/phpunit/tests/query/verboseRewriteRules.php
+++ b/tests/phpunit/tests/query/verboseRewriteRules.php
@@ -8,15 +8,10 @@ require_once dirname( __FILE__ ) . '/conditionals.php';
  */
 class Tests_Query_VerbosePageRules extends Tests_Query_Conditionals {
 	function setUp() {
-		global $wp_rewrite;
-
 		parent::setUp();
-		
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%category%/%year%/%postname%/' );
 
 		create_initial_taxonomies();
 
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%category%/%year%/%postname%/' );
 	}
 }
diff --git a/tests/phpunit/tests/rewrite.php b/tests/phpunit/tests/rewrite.php
index 0813c3d29a..80f2e9a986 100644
--- a/tests/phpunit/tests/rewrite.php
+++ b/tests/phpunit/tests/rewrite.php
@@ -9,16 +9,11 @@ class Tests_Rewrite extends WP_UnitTestCase {
 	private $home_url;
 
 	function setUp() {
-		global $wp_rewrite;
 		parent::setUp();
 
-		// Need rewrite rules in place to use url_to_postid
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
-
 		create_initial_taxonomies();
 
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 
 		$this->home_url = get_option( 'home' );
 	}
diff --git a/tests/phpunit/tests/rewrite/numericSlugs.php b/tests/phpunit/tests/rewrite/numericSlugs.php
index 5d8745904d..c8f3b28d23 100644
--- a/tests/phpunit/tests/rewrite/numericSlugs.php
+++ b/tests/phpunit/tests/rewrite/numericSlugs.php
@@ -20,10 +20,8 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_go_to_year_segment_collision_without_title() {
-		global $wp_rewrite, $wpdb;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%postname%/' );
-		$wp_rewrite->flush_rules();
+		global $wpdb;
+		$this->set_permalink_structure( '/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -50,10 +48,8 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_url_to_postid_year_segment_collision_without_title() {
-		global $wp_rewrite, $wpdb;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%postname%/' );
-		$wp_rewrite->flush_rules();
+		global $wpdb;
+		$this->set_permalink_structure( '/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -78,10 +74,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_go_to_year_segment_collision_with_title() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -97,10 +90,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_url_to_postid_year_segment_collision_with_title() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -114,10 +104,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_go_to_month_segment_collision_without_title() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -134,10 +121,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_url_to_postid_month_segment_collision_without_title() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -152,10 +136,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_go_to_month_segment_collision_without_title_no_leading_zero() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -172,10 +153,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_url_to_postid_month_segment_collision_without_title_no_leading_zero() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -190,10 +168,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_go_to_month_segment_collision_with_title() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -209,10 +184,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_url_to_postid_month_segment_collision_with_title() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -226,10 +198,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_go_to_month_segment_collision_with_title_no_leading_zero() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -245,10 +214,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_url_to_postid_month_segment_collision_with_title_no_leading_zero() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -262,10 +228,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_go_to_day_segment_collision_without_title() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -282,10 +245,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_url_to_postid_day_segment_collision_without_title() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -300,10 +260,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_go_to_day_segment_collision_with_title() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -319,10 +276,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_url_to_postid_day_segment_collision_with_title() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -336,10 +290,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_numeric_slug_permalink_conflicts_should_only_be_resolved_for_the_main_query() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -360,10 +311,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_month_slug_collision_should_resolve_to_date_archive_when_year_does_not_match_post_year() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		// Make sure a post is published in 2013/02, to avoid 404s.
 		$this->factory->post->create( array(
@@ -391,10 +339,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_day_slug_collision_should_resolve_to_date_archive_when_monthnum_does_not_match_post_month() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%postname%/' );
 
 		// Make sure a post is published on 2015/01/01, to avoid 404s.
 		$this->factory->post->create( array(
@@ -422,10 +367,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_date_slug_collision_should_distinguish_valid_pagination_from_date() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -441,10 +383,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_date_slug_collision_should_distinguish_too_high_pagination_from_date() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -460,10 +399,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_date_slug_collision_should_not_require_pagination_query_var() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
@@ -480,10 +416,7 @@ class Tests_Rewrite_NumericSlugs extends WP_UnitTestCase {
 	}
 
 	public function test_date_slug_collision_should_be_ignored_when_pagination_var_is_present_but_post_does_not_have_multiple_pages() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%year%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%postname%/' );
 
 		$id = $this->factory->post->create( array(
 			'post_author'  => $this->author_id,
diff --git a/tests/phpunit/tests/rewrite/oldSlugRedirect.php b/tests/phpunit/tests/rewrite/oldSlugRedirect.php
index 8497c90c49..02323dc69e 100644
--- a/tests/phpunit/tests/rewrite/oldSlugRedirect.php
+++ b/tests/phpunit/tests/rewrite/oldSlugRedirect.php
@@ -19,13 +19,12 @@ class Tests_Rewrite_OldSlugRedirect extends WP_UnitTestCase {
 
 		add_filter( 'old_slug_redirect_url', array( $this, 'filter_old_slug_redirect_url' ), 10, 1 );
 
-		global $wp_rewrite;
+		$this->set_permalink_structure( '/%postname%/' );
 
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%postname%/' );
 		add_rewrite_endpoint( 'custom-endpoint', EP_PERMALINK );
 		add_rewrite_endpoint( 'second-endpoint', EP_PERMALINK, 'custom' );
-		$wp_rewrite->flush_rules();
+
+		flush_rewrite_rules();
 	}
 
 	public function tearDown() {
diff --git a/tests/phpunit/tests/term/getTermLink.php b/tests/phpunit/tests/term/getTermLink.php
index 932c638e59..7ba2488bfb 100644
--- a/tests/phpunit/tests/term/getTermLink.php
+++ b/tests/phpunit/tests/term/getTermLink.php
@@ -85,10 +85,7 @@ class Tests_Term_GetTermLink extends WP_UnitTestCase {
 	}
 
 	public function test_taxonomy_permastruct_with_hierarchical_rewrite_should_put_term_ancestors_in_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%/' );
 
 		register_taxonomy( 'wptests_tax2', 'post', array(
 			'hierarchical' => true,
@@ -98,6 +95,8 @@ class Tests_Term_GetTermLink extends WP_UnitTestCase {
 			),
 		) );
 
+		flush_rewrite_rules();
+
 		$t1 = $this->factory->term->create( array(
 			'taxonomy' => 'wptests_tax2',
 			'slug' => 'term1',
@@ -115,10 +114,7 @@ class Tests_Term_GetTermLink extends WP_UnitTestCase {
 	}
 
 	public function test_taxonomy_permastruct_with_nonhierarchical_rewrite_should_not_put_term_ancestors_in_link() {
-		global $wp_rewrite;
-		$permalink_structure = get_option( 'permalink_structure' );
-		$wp_rewrite->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%year%/%monthnum%/%day%/%postname%/' );
 
 		register_taxonomy( 'wptests_tax2', 'post', array(
 			'hierarchical' => true,
@@ -128,6 +124,8 @@ class Tests_Term_GetTermLink extends WP_UnitTestCase {
 			),
 		) );
 
+		flush_rewrite_rules();
+
 		$t1 = $this->factory->term->create( array(
 			'taxonomy' => 'wptests_tax2',
 			'slug' => 'term1',
diff --git a/tests/phpunit/tests/user/author.php b/tests/phpunit/tests/user/author.php
index 09dadf5743..8b83ada7a1 100644
--- a/tests/phpunit/tests/user/author.php
+++ b/tests/phpunit/tests/user/author.php
@@ -127,10 +127,7 @@ class Tests_User_Author_Template extends WP_UnitTestCase {
 	 * @ticket 30355
 	 */
 	public function test_get_the_author_posts_link_with_permalinks() {
-		global $wp_rewrite;
-		$wp_rewrite->init();
-		$wp_rewrite->set_permalink_structure( '/%postname%/' );
-		$wp_rewrite->flush_rules();
+		$this->set_permalink_structure( '/%postname%/' );
 
 		$author = $this->factory->user->create_and_get( array(
 			'display_name'  => 'Foo',