diff --git a/tests/phpunit/tests/media/getAdjacentImageLink.php b/tests/phpunit/tests/media/getAdjacentImageLink.php
index 3f3d6c3c28..265c5d6bb2 100644
--- a/tests/phpunit/tests/media/getAdjacentImageLink.php
+++ b/tests/phpunit/tests/media/getAdjacentImageLink.php
@@ -3,7 +3,7 @@
 require_once __DIR__ . '/testcase-adjacent-image-link.php';
 
 /**
- * @group  media
+ * @group media
  * @covers ::get_adjacent_image_link
  */
 class Tests_Media_GetAdjacentImageLink extends WP_Test_Adjacent_Image_Link_TestCase {
diff --git a/tests/phpunit/tests/media/getNextImageLink.php b/tests/phpunit/tests/media/getNextImageLink.php
index 484f13ddf9..feb5fdbdf7 100644
--- a/tests/phpunit/tests/media/getNextImageLink.php
+++ b/tests/phpunit/tests/media/getNextImageLink.php
@@ -3,7 +3,7 @@
 require_once __DIR__ . '/testcase-adjacent-image-link.php';
 
 /**
- * @group  media
+ * @group media
  * @covers ::get_next_image_link
  */
 class Tests_Media_GetNextImageLink extends WP_Test_Adjacent_Image_Link_TestCase {
@@ -17,7 +17,7 @@ class Tests_Media_GetNextImageLink extends WP_Test_Adjacent_Image_Link_TestCase
 	 *
 	 * @dataProvider data_get_next_image_link
 	 */
-	function test_get_next_image_link( $current_attachment_index, $expected_attachment_index = 0, $expected, array $args = array() ) {
+	function test_get_next_image_link( $current_attachment_index, $expected_attachment_index, $expected, array $args = array() ) {
 		list( $expected, $args ) = $this->setup_test_scenario( $current_attachment_index, $expected_attachment_index, $expected, $args );
 
 		$actual = get_next_image_link( ...$args );
diff --git a/tests/phpunit/tests/media/getPreviousImageLink.php b/tests/phpunit/tests/media/getPreviousImageLink.php
index 9c98c883cc..61763ee3a2 100644
--- a/tests/phpunit/tests/media/getPreviousImageLink.php
+++ b/tests/phpunit/tests/media/getPreviousImageLink.php
@@ -3,7 +3,7 @@
 require_once __DIR__ . '/testcase-adjacent-image-link.php';
 
 /**
- * @group  media
+ * @group media
  * @covers ::get_previous_image_link
  */
 class Tests_Media_GetPreviousImageLink extends WP_Test_Adjacent_Image_Link_TestCase {
@@ -17,7 +17,7 @@ class Tests_Media_GetPreviousImageLink extends WP_Test_Adjacent_Image_Link_TestC
 	 *
 	 * @dataProvider data_get_previous_image_link
 	 */
-	function test_get_previous_image_link( $current_attachment_index, $expected_attachment_index = 0, $expected, array $args = array() ) {
+	function test_get_previous_image_link( $current_attachment_index, $expected_attachment_index, $expected, array $args = array() ) {
 		list( $expected, $args ) = $this->setup_test_scenario( $current_attachment_index, $expected_attachment_index, $expected, $args );
 
 		$actual = get_previous_image_link( ...$args );
diff --git a/tests/phpunit/tests/media/nextImageLink.php b/tests/phpunit/tests/media/nextImageLink.php
index fc4527f49e..f3ba340b7f 100644
--- a/tests/phpunit/tests/media/nextImageLink.php
+++ b/tests/phpunit/tests/media/nextImageLink.php
@@ -3,7 +3,7 @@
 require_once __DIR__ . '/testcase-adjacent-image-link.php';
 
 /**
- * @group  media
+ * @group media
  * @covers ::next_image_link
  */
 class Tests_Media_NextImageLink extends WP_Test_Adjacent_Image_Link_TestCase {
@@ -17,7 +17,7 @@ class Tests_Media_NextImageLink extends WP_Test_Adjacent_Image_Link_TestCase {
 	 *
 	 * @dataProvider data_next_image_link
 	 */
-	function test_next_image_link( $current_attachment_index, $expected_attachment_index = 0, $expected, array $args = array() ) {
+	function test_next_image_link( $current_attachment_index, $expected_attachment_index, $expected, array $args = array() ) {
 		list( $expected, $args ) = $this->setup_test_scenario( $current_attachment_index, $expected_attachment_index, $expected, $args );
 
 		$this->expectOutputString( $expected );
diff --git a/tests/phpunit/tests/media/previousImageLink.php b/tests/phpunit/tests/media/previousImageLink.php
index 7cdb24e0bf..769d029d89 100644
--- a/tests/phpunit/tests/media/previousImageLink.php
+++ b/tests/phpunit/tests/media/previousImageLink.php
@@ -3,7 +3,7 @@
 require_once __DIR__ . '/testcase-adjacent-image-link.php';
 
 /**
- * @group  media
+ * @group media
  * @covers ::previous_image_link
  */
 class Tests_Media_PreviousImageLink extends WP_Test_Adjacent_Image_Link_TestCase {
@@ -17,7 +17,7 @@ class Tests_Media_PreviousImageLink extends WP_Test_Adjacent_Image_Link_TestCase
 	 *
 	 * @dataProvider data_previous_image_link
 	 */
-	function test_previous_image_link( $current_attachment_index, $expected_attachment_index = 0, $expected, array $args = array() ) {
+	function test_previous_image_link( $current_attachment_index, $expected_attachment_index, $expected, array $args = array() ) {
 		list( $expected, $args ) = $this->setup_test_scenario( $current_attachment_index, $expected_attachment_index, $expected, $args );
 
 		$this->expectOutputString( $expected );