Ticket #50671: 50671.diff

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

@@ -1013 +1013 @@
                 copy( DIR_TESTDATA . '/plugins/link-manager.zip', DIR_TESTDATA . '/link-manager.zip' );
                 add_filter(
                         'upgrader_pre_download',
-                        function () {
-                                return DIR_TESTDATA . '/link-manager.zip';
-                        }
+                        static function ( $reply, $package, $upgrader ) {
+                                if ( $upgrader instanceof Plugin_Upgrader ) {
+                                        $reply = DIR_TESTDATA . '/link-manager.zip';
+                                }
+
+                                return $reply;
+                        },
+                        10,
+                        3
                 );
         }