feat(WPLoader) load theme from arbitrary path

docs/modules/WPLoader.md

@@ -56,8 +56,9 @@ When used in this mode, the module supports the following configuration paramete
   during normal activation and are known to work correctly when activated silently. Plugin paths can be specified
   following the same format of the `plugins` parameter.
 * `bootstrapActions` - a list of actions or callables to call **after** WordPress is loaded and before the tests run.
-* `theme` - the theme to activate and load in the WordPress installation. The theme must be specified in slug format
-  like `twentytwentythree`.
+* `theme` - the theme to activate and load in the WordPress installation. The theme can be specified in slug format,
+  e.g., `twentytwentythree`, to load it from the WordPress installation themes directory. Alternatively, the theme can
+  be specified as an absolute or relative path to a theme folder, e.g., `/home/themes/my-theme` or `vendor/acme/vendor-theme`. To use both a parent and ha child theme from arbitrary absolute or relative paths, define the `theme` parameter as an array of theme paths, e.g., `['/home/themes/parent-theme', '.']`.
 * `AUTH_KEY` - the `AUTH_KEY` constant value to use when loading WordPress. If the `wpRootFolder` path points at a
   configured installation, containing the `wp-config.php` file, then the value of the constant in the configuration file
   will be used, else it will be randomly generated.
@@ -128,11 +129,15 @@ modules:
         adminEmail: admin@wordpress.test
         title: 'Integration Tests'
         plugins:
-          - hello.php # This plugin will be loaded from the WordPress installation plugins directory.
-          - /home/plugins/woocommerce/woocommerce.php # This plugin will be loaded from an arbitrary absolute path.
-          - vendor/acme/project/plugin.php # This plugin will be loaded from an arbitrary relative path inside the project root folder.
-          - my-plugin.php # This plugin will be loaded from the project root folder.
-        theme: twentytwentythree
+          # This plugin will be loaded from the WordPress installation plugins directory.
+          - hello.php 
+          # This plugin will be loaded from an arbitrary absolute path.
+          - /home/plugins/woocommerce/woocommerce.php 
+          # This plugin will be loaded from an arbitrary relative path inside the project root folder.
+          - vendor/acme/project/plugin.php
+          # This plugin will be loaded from the project root folder.
+          - my-plugin.php
+        theme: twentytwentythree # Load the theme from the WordPress installation themes directory.
 ```
 
 The following configuration uses [dynamic configuration parameters][3] to set the module configuration:
@@ -151,11 +156,12 @@ modules:
         adminEmail: '%WP_ADMIN_EMAIL%'
         title: '%WP_TITLE%'
         plugins:
-          - hello.php # This plugin will be loaded from the WordPress installation plugins directory.
-          - /home/plugins/woocommerce/woocommerce.php # This plugin will be loaded from an arbitrary absolute path.
-          - my-plugin.php # This plugin will be loaded from the project root folder.
-          - vendor/acme/project/plugin.php # This plugin will be loaded from an arbitrary relative path inside the project root folder.
-        theme: twentytwentythree
+          - hello.php
+          - /home/plugins/woocommerce/woocommerce.php
+          - my-plugin.php
+          - vendor/acme/project/plugin.php
+        # Parent theme from the WordPress installation themes directory, child theme from absolute path.
+        theme: [twentytwentythree, /home/themes/my-theme]
 ```
 
 The following example configuration uses a SQLite database and loads a database fixture before the tests run:
@@ -181,7 +187,11 @@ modules:
           - hello.php
           - woocommerce/woocommerce.php
           - my-plugin/my-plugin.php
-        theme: twentytwentythree
+        theme: 
+          # Parent theme from relative path.
+          - vendor/acme/parent-theme
+          # Child theme from the current working directory.
+          - .
 ```
 
 The follow example configuration prevents the backup of globals and static attributes in all the tests of the suite that

includes/core-phpunit/wp-tests-config.php

@@ -54,10 +54,12 @@
 }
 
 $abspath = rtrim($wpLoaderConfig['wpRootFolder'], '\\/') . '/';
+$themes = (array)$wpLoaderConfig['theme'];
+$stylesheet = end($themes);
 
 foreach ([
              'ABSPATH' => $abspath,
-             'WP_DEFAULT_THEME' => $wpLoaderConfig['theme'],
+             'WP_DEFAULT_THEME' => $stylesheet,
              'WP_TESTS_MULTISITE' => $wpLoaderConfig['multisite'],
              'WP_DEBUG' => true,
              'DB_NAME' => $wpLoaderConfig['dbName'],
@@ -91,7 +93,7 @@
         define($const, $value);
     }
 }
-unset($const);
+unset($const, $themes, $stylesheet);
 
 $table_prefix = $wpLoaderConfig['tablePrefix'];
 

src/Module/WPLoader.php

@@ -23,6 +23,7 @@
 use lucatume\WPBrowser\Utils\CorePHPUnit;
 use lucatume\WPBrowser\Utils\Db as DbUtils;
 use lucatume\WPBrowser\Utils\Filesystem as FS;
+use lucatume\WPBrowser\Utils\Property;
 use lucatume\WPBrowser\Utils\Random;
 use lucatume\WPBrowser\WordPress\CodeExecution\CodeExecutionFactory;
 use lucatume\WPBrowser\WordPress\Database\DatabaseInterface;
@@ -105,7 +106,7 @@ class WPLoader extends Module
      *     plugins: string[],
      *     silentlyActivatePlugins: string[],
      *     bootstrapActions: string|string[],
-     *     theme: string,
+     *     theme: string|string[],
      *     AUTH_KEY: string,
      *     SECURE_AUTH_KEY: string,
      *     LOGGED_IN_KEY: string,
@@ -228,11 +229,13 @@ protected function validateConfig(): void
 
         $this->config['theme'] = $this->config['WP_TESTS_MULTISITE'] ?? $this->config['theme'] ?? '';
 
-        if (!is_string($this->config['theme'])) {
+        if (!(
+            is_string($this->config['theme'])
+            || (is_array($this->config['theme']) && Arr::hasShape($this->config['theme'], ['string', 'string'])))
+        ) {
             throw new ModuleConfigException(
                 __CLASS__,
-                "The `theme` configuration parameter must be a string.\n" .
-                "For child themes, use the child theme slug."
+                "The `theme` configuration parameter must be either a string, or an array of two strings."
             );
         }
 
@@ -349,7 +352,7 @@ public function _initialize(): void
          *     plugins: string[],
          *     silentlyActivatePlugins: string[],
          *     bootstrapActions: string|string[],
-         *     theme: string,
+         *     theme: string|string[],
          *     AUTH_KEY: string,
          *     SECURE_AUTH_KEY: string,
          *     LOGGED_IN_KEY: string,
@@ -589,7 +592,7 @@ public function getPluginsFolder(string $path = ''): string
     }
 
     /**
-     * Returns the absolute path to the themes directory.
+     * Returns the absolute path to the themes' directory.
      *
      * @example
      * ```php
@@ -656,6 +659,11 @@ private function installAndBootstrapInstallation(): void
 
         $silentPlugins = $this->config['silentlyActivatePlugins'];
         $this->includeAllPlugins(array_merge($plugins, $silentPlugins), $isMultisite);
+        if (!empty($this->config['theme'])) {
+            /** @var string|array{string,string} $theme */
+            $theme = $this->config['theme'];
+            $this->switchThemeFromFile($theme);
+        }
         $this->includeCorePHPUniteSuiteBootstrapFile();
 
         Dispatcher::dispatch(self::EVENT_AFTER_INSTALL, $this);
@@ -701,15 +709,15 @@ static function (string $plugin, bool $silent) use ($closuresFactory, $multisite
             )
         );
 
-        /** @var string $stylesheet */
-        $stylesheet = $this->config['theme'];
-        if ($stylesheet) {
-            $jobs['stylesheet::' . $stylesheet] = $closuresFactory->toSwitchTheme($stylesheet, $multisite);
+        $themes = (array)$this->config['theme'];
+        foreach ($themes as $theme) {
+            $jobs['theme::' . basename($theme)] = $closuresFactory->toSwitchTheme($theme, $multisite);
         }
 
         $pluginsList = implode(', ', $plugins);
-        if ($stylesheet) {
-            codecept_debug('Activating plugins: ' . $pluginsList . ' and switching theme: ' . $stylesheet);
+        if ($themes) {
+            codecept_debug('Activating plugins: ' . $pluginsList
+                . ' and switching theme(s): ' . implode(', ', array_map('basename', $themes)));
         } else {
             codecept_debug('Activating plugins: ' . $pluginsList);
         }
@@ -731,7 +739,7 @@ static function (string $plugin, bool $silent) use ($closuresFactory, $multisite
                     : $result->getStdoutBuffer();
                 $message = $type === 'plugin' ?
                     "Failed to activate plugin $name. $reason"
-                    : "Failed to switch theme $name. $reason";
+                    : "Failed to switch to theme $name. $reason";
                 throw new ModuleException(__CLASS__, $message);
             }
         }
@@ -1056,8 +1064,9 @@ private function muActivatePluginsTheme(array $plugins): array
         $database = $this->db;
 
         if ($this->config['theme']) {
+            $themes = (array)$this->config['theme'];
             // Refresh the theme related options.
-            update_site_option('allowedthemes', [$this->config['theme'] => true]);
+            update_site_option('allowedthemes', array_combine($themes, array_fill(0, count($themes), true)));
             if ($database === null) {
                 throw new ModuleException(
                     __CLASS__,
@@ -1152,4 +1161,57 @@ private function includeAllPlugins(array $plugins, bool $isMultisite): void
             }
         }, -100000);
     }
+
+    /**
+     * @param string|array{string,string} $theme
+     */
+    private function switchThemeFromFile(string|array $theme):void
+    {
+        [$template, $stylesheet] = is_array($theme) ? $theme : [$theme, $theme];
+        $templateRealpath = realpath($template);
+        $stylesheetRealpath = realpath($stylesheet);
+        $include = 0;
+
+        if ($templateRealpath) {
+            $include |= 1;
+        }
+
+        if ($stylesheetRealpath) {
+            $include |= 2;
+        }
+
+        if ($include === 0) {
+            return;
+        }
+
+        /** @var string $templateRealpath */
+        /** @var string $stylesheetRealpath */
+
+        PreloadFilters::addFilter('after_setup_theme', static function () use (
+            $include,
+            $templateRealpath,
+            $stylesheetRealpath
+        ) {
+            global $wp_stylesheet_path, $wp_template_path, $wp_theme_directories;
+            ($include & 1) && $wp_template_path = $templateRealpath;
+            ($include & 2) && $wp_stylesheet_path = $stylesheetRealpath;
+            ($include & 1) && ($wp_theme_directories[] = dirname($templateRealpath));
+            ($include & 2) && ($wp_theme_directories[] = dirname($stylesheetRealpath));
+            $wp_theme_directories = array_values(array_unique($wp_theme_directories));
+            // Stylesheet first, template second.
+            (($include & 2) && ($stylesheetRealpath !== $templateRealpath))
+                && include $stylesheetRealpath . '/functions.php';
+            ($include & 1) && include $templateRealpath . '/functions.php';
+        }, -100000);
+
+        $templateName = basename($templateRealpath);
+        $templateRoot = dirname($templateRealpath);
+        $stylesheetName = basename($stylesheetRealpath);
+        $stylesheetRoot = dirname($stylesheetRealpath);
+
+        PreloadFilters::addFilter('pre_option_template', static fn() => $templateName);
+        PreloadFilters::addFilter('pre_option_template_root', static fn() => $templateRoot);
+        PreloadFilters::addFilter('pre_option_stylesheet', static fn() => $stylesheetName);
+        PreloadFilters::addFilter('pre_option_stylesheet_root', static fn() => $stylesheetRoot);
+    }
 }

src/WordPress/CodeExecution/ThemeSwitchAction.php

@@ -34,8 +34,21 @@ private function switchTheme(string $stylesheet, bool $multisite): void
     {
         // The `switch_theme` function will not complain about a missing theme: check it now.
         $theme = wp_get_theme($stylesheet);
-        if (!($theme instanceof WP_Theme && $theme->exists())) {
-            throw new InstallationException("Theme $stylesheet does not exist.");
+
+        if (!($theme instanceof WP_Theme && $theme->exists() && !$theme->errors())) {
+            $themeRealPath = realpath($stylesheet);
+
+            if ($themeRealPath && is_dir($themeRealPath) && is_file($themeRealPath . '/style.css')) {
+                $this->loadThemeFromFile($themeRealPath, $multisite);
+                return;
+            }
+
+            $message = "Errors with theme $stylesheet.";
+            if ($theme->errors()) {
+                $message = implode(', ', $theme->errors()->get_error_messages());
+            }
+
+            throw new InstallationException($message);
         }
 
         if ($multisite) {
@@ -53,4 +66,13 @@ public function getClosure(): Closure
             return $request->execute();
         };
     }
+
+    private function loadThemeFromFile(string $themeRealPath, bool $multisite): void
+    {
+        include_once $themeRealPath . '/functions.php';
+        $basename = basename($themeRealPath);
+        update_option('template', $basename);
+        update_option('stylesheet', $basename);
+        do_action('after_setup_theme');
+    }
 }

tests/_data/themes/dummy/style.css

@@ -1,6 +1,5 @@
 /*
 Theme Name:     Dummy
 Description:    Dummy theme.
-Template:       dummy
 Version:        0.1.0
 */

tests/_support/_generated/WploaderTesterActions.php

@@ -1,4 +1,4 @@
-<?php  //[STAMP] b4b2d5c74a9a68974589fd65502547ce
+<?php  //[STAMP] a9a237b1518f3878f1c2f5e7920998b6
 // phpcs:ignoreFile
 namespace _generated;
 
@@ -67,7 +67,7 @@ public function getPluginsFolder(string $path = ""): string {
     /**
      * [!] Method is generated. Documentation taken from corresponding module.
      *
-     * Returns the absolute path to the themes directory.
+     * Returns the absolute path to the themes' directory.
      *
      * @example
      * ```php