add benchmark file and run it in CI

.github/workflows/php.yml

@@ -18,3 +18,5 @@ jobs:
         run: composer run-script test
       - name: Run codestyle sniffer
         run: composer run-script codestyle
+      - name: Run benchmark
+        run: php tests/benchmark.php

tests/benchmark-mocks.php

@@ -0,0 +1,183 @@
+<?php
+
+/*
+ * phpcs:disable PSR1.Files.SideEffects
+ * phpcs:disable PSR1.Classes.ClassDeclaration.MissingNamespace
+*/
+
+define('ABSPATH', dirname(__DIR__, 1));
+define('HOUR_IN_SECONDS', 3600);
+
+$options = [];
+$hooks = [];
+
+function is_admin()
+{
+    return false;
+}
+
+function add_action($hook, $callback, $c = 10, $d = 1)
+{
+    global $hooks;
+    $hooks[$hook] ??= [];
+    $hooks[$hook][] = $callback;
+}
+
+function do_action($hook, ...$args)
+{
+    global $hooks;
+    $actions = $hooks[$hook] ?? [];
+    foreach ($actions as $a) {
+        $a();
+    }
+}
+
+function add_filter($hook, $callback, $c = 10, $d = 1)
+{
+    add_action($hook, $callback, $c, $d);
+}
+
+function apply_filters($hook, $value, $prio = 10, $args = 2)
+{
+    global $hooks;
+
+    $filters = $hooks[$hook] ?? [];
+    foreach ($filters as $cb) {
+        $value = $cb($value);
+    }
+
+    return $value;
+}
+
+function add_shortcode($a, $b)
+{
+}
+
+function number_format_i18n($number, $decimals = 0)
+{
+    return number_format($number, $decimals);
+}
+
+function register_activation_hook($file, $callback)
+{
+}
+
+function register_deactivation_hook($file, $callback)
+{
+}
+
+function update_option($option_name, $value, $autoload = false)
+{
+    global $options;
+    $options[$option_name] = $value;
+}
+
+function get_option($option_name, $default = null)
+{
+    global $options;
+    return $options[$option_name] ?? $default;
+}
+
+function get_transient($name)
+{
+    return null;
+}
+
+function set_transient($name, $value, $ttl)
+{
+}
+
+function delete_transient($name)
+{
+}
+
+function get_role($role)
+{
+    return null;
+}
+
+function get_site_url()
+{
+    return '';
+}
+
+function site_url()
+{
+    return '';
+}
+
+function is_multisite()
+{
+    return false;
+}
+
+function wp_next_scheduled($event)
+{
+    return false;
+}
+
+function wp_schedule_event($timestamp, $recurrence, $hook, $args = [])
+{
+}
+
+function wp_upload_dir()
+{
+    return [
+        'basedir' => '/tmp',
+    ];
+}
+
+function wp_remote_get($url)
+{
+    return null;
+}
+
+function wp_remote_retrieve_response_code($response)
+{
+    return '';
+}
+
+function wp_remote_retrieve_headers($response)
+{
+    return [];
+}
+
+function is_wp_error($thing)
+{
+    return false;
+}
+
+function __($string, $text_domain)
+{
+    return $string;
+}
+
+function register_post_type($name, $args)
+{
+}
+
+function wp_register_script($handle, $src, $deps = [], $version = '')
+{
+}
+
+function plugins_url($file, $path)
+{
+    return $path;
+}
+
+class wpdb_mock
+{
+    public $prefix = '';
+    public function query($sql)
+    {
+        return null;
+    }
+
+    public function prepare($query, ...$params)
+    {
+        return $query;
+    }
+}
+
+global $wpdb;
+$wpdb = new wpdb_mock();

tests/benchmark.php

@@ -0,0 +1,23 @@
+<?php
+
+require __DIR__ . '/benchmark-mocks.php';
+
+// make sure we're not running through all migrations
+update_option('mc4wp_version', '999.1.1');
+
+$memory = memory_get_usage();
+$time_start = microtime(true);
+
+require dirname(__DIR__, 1) . '/mailchimp-for-wp.php';
+
+do_action('plugins_loaded');
+do_action('setup_theme');
+do_action('after_setup_theme');
+do_action('init');
+do_action('wp_loaded');
+
+$time = round((microtime(true) - $time_start) * 1000, 2);
+$memory_used = (memory_get_usage() - $memory) >> 10;
+
+echo "Memory: $memory_used KB\n";
+echo "Time: $time ms\n";