fix: establish managed multisite constants

Author: chubes4

packages/runtime-playground/src/phpunit-command-handlers.ts

@@ -1113,7 +1113,7 @@ if (!is_array($wp_config_defines)) {
     $wp_config_defines = array();
 }
 if ($multisite) {
-    $wp_config_defines += array(
+    $multisite_defines = array(
         'WP_TESTS_MULTISITE' => true,
         'MULTISITE' => true,
         'SUBDOMAIN_INSTALL' => false,
@@ -1122,6 +1122,12 @@ if ($multisite) {
         'SITE_ID_CURRENT_SITE' => 1,
         'BLOG_ID_CURRENT_SITE' => 1,
     );
+    $wp_config_defines += $multisite_defines;
+    foreach ($multisite_defines as $name => $value) {
+        if (!defined($name)) {
+            define($name, $value);
+        }
+    }
     putenv('WP_MULTISITE=1');
     $_ENV['WP_MULTISITE'] = '1';
 }

tests/phpunit-project-autoload.test.ts

@@ -726,6 +726,7 @@ assert.ok(managedModeCode.includes("configured PHPUnit harness autoload file is
 assert.ok(managedModeCode.includes("define('DB_NAME', ':memory:');"), "default managed PHPUnit remains on SQLite")
 assert.ok(managedModeCode.includes("'cacheResult' => false"))
 assert.ok(managedModeCode.includes("global $argv, $pg_stage_output_buffering, $wp_rewrite;"), "managed WordPress installation must expose the rewrite global required by multisite setup")
+assert.ok(managedModeCode.includes("foreach ($multisite_defines as $name => $value)"), "managed multisite must establish network constants before the WordPress test installer runs")
 assert.ok(managedModeCode.includes('$dep_mounts = "/wordpress/wp-content/plugins/demo-plugin\\n/wordpress/wp-content/plugins/dependency";'), "dependency mounts must be newline-delimited for the generated PHP runner")
 const installStageIndex = managedModeCode.indexOf("pg_run_install_stage(array(")
 const dependencyLoadStageIndex = managedModeCode.indexOf("$loaded_dep_files = pg_run_load_deps_stage", installStageIndex)