Fix sideload tests for non-secure contexts

The sideload route is only registered when client-side media
processing is enabled, which now requires SSL or localhost.
Force-enable the filter in affected tests so routes register
correctly in CI.

Author: adamsilverstein

tests/phpunit/tests/rest-api/rest-attachments-controller.php

@@ -3162,6 +3162,7 @@ static function ( $data ) use ( &$captured_data ) {
 	 * @requires function imagejpeg
 	 */
 	public function test_sideload_scaled_image() {
+		add_filter( 'wp_client_side_media_processing_enabled', '__return_true' );
 		wp_set_current_user( self::$author_id );
 
 		// First, create an attachment.
@@ -3215,6 +3216,7 @@ public function test_sideload_scaled_image() {
 	 * @requires function imagejpeg
 	 */
 	public function test_sideload_scaled_image_requires_auth() {
+		add_filter( 'wp_client_side_media_processing_enabled', '__return_true' );
 		wp_set_current_user( self::$author_id );
 
 		// Create an attachment.
@@ -3244,6 +3246,7 @@ public function test_sideload_scaled_image_requires_auth() {
 	 * @ticket 64737
 	 */
 	public function test_sideload_route_includes_scaled_enum() {
+		add_filter( 'wp_client_side_media_processing_enabled', '__return_true' );
 		$server = rest_get_server();
 		$routes = $server->get_routes();
 
@@ -3266,6 +3269,7 @@ public function test_sideload_route_includes_scaled_enum() {
 	 * @requires function imagejpeg
 	 */
 	public function test_sideload_scaled_unique_filename() {
+		add_filter( 'wp_client_side_media_processing_enabled', '__return_true' );
 		wp_set_current_user( self::$author_id );
 
 		// Create an attachment.
@@ -3300,6 +3304,7 @@ public function test_sideload_scaled_unique_filename() {
 	 * @requires function imagejpeg
 	 */
 	public function test_sideload_scaled_unique_filename_conflict() {
+		add_filter( 'wp_client_side_media_processing_enabled', '__return_true' );
 		wp_set_current_user( self::$author_id );
 
 		// Create the first attachment.

tests/phpunit/tests/rest-api/rest-schema-setup.php

@@ -16,6 +16,9 @@ class WP_Test_REST_Schema_Initialization extends WP_Test_REST_TestCase {
 	public function set_up() {
 		parent::set_up();
 
+		// Ensure client-side media processing is enabled so the sideload route is registered.
+		add_filter( 'wp_client_side_media_processing_enabled', '__return_true' );
+
 		/** @var WP_REST_Server $wp_rest_server */
 		global $wp_rest_server;
 		$wp_rest_server = new Spy_REST_Server();