first commit

core/tests/Drupal/KernelTests/FileSystemModuleDiscoveryDataProviderTrait.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\KernelTests;
+
+/**
+ * A trait used in testing for providing a list of modules in a dataProvider.
+ */
+trait FileSystemModuleDiscoveryDataProviderTrait {
+
+  /**
+   * A data provider that lists every module in core.
+   *
+   * @return array
+   *   An array of module names to test.
+   */
+  public static function coreModuleListDataProvider(): array {
+    $prefix = dirname(__DIR__, 3) . DIRECTORY_SEPARATOR . 'modules';
+    $module_dirs = array_keys(iterator_to_array(new \FilesystemIterator($prefix)));
+    $module_names = array_map(function ($path) use ($prefix) {
+      return str_replace($prefix . DIRECTORY_SEPARATOR, '', $path);
+    }, $module_dirs);
+    $modules_keyed = array_combine($module_names, $module_names);
+
+    $data = array_map(function ($module) {
+      return [$module];
+    }, $modules_keyed);
+
+    return $data;
+  }
+
+}