Initial Drupal 11 with DDEV setup

web/core/tests/Drupal/TestTools/PhpUnitCompatibility/PhpUnit10/TestCompatibilityTrait.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\TestTools\PhpUnitCompatibility\PhpUnit10;
+
+/**
+ * Drupal's forward compatibility layer with multiple versions of PHPUnit.
+ *
+ * @internal
+ */
+trait TestCompatibilityTrait {
+
+  /**
+   * Gets @covers defined on the test class.
+   *
+   * @return string[]
+   *   An array of classes listed with the @covers annotation.
+   */
+  public function getTestClassCovers(): array {
+    $ret = [];
+    foreach ($this->valueObjectForEvents()->metadata()->isCovers()->isClassLevel() as $metadata) {
+      $ret[] = $metadata->target();
+    }
+    return $ret;
+  }
+
+}

web/core/tests/Drupal/TestTools/PhpUnitCompatibility/PhpUnit11/TestCompatibilityTrait.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\TestTools\PhpUnitCompatibility\PhpUnit11;
+
+/**
+ * Drupal's forward compatibility layer with multiple versions of PHPUnit.
+ *
+ * @internal
+ */
+trait TestCompatibilityTrait {
+}

web/core/tests/Drupal/TestTools/PhpUnitCompatibility/RunnerVersion.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\TestTools\PhpUnitCompatibility;
+
+use PHPUnit\Runner\Version;
+
+/**
+ * Helper class to determine information about running PHPUnit version.
+ *
+ * This class contains static methods only and is not meant to be instantiated.
+ */
+final class RunnerVersion {
+
+  /**
+   * This class should not be instantiated.
+   */
+  private function __construct() {
+  }
+
+  /**
+   * Returns the major version of the PHPUnit runner being used.
+   *
+   * @return int
+   *   The major version of the PHPUnit runner being used.
+   */
+  public static function getMajor() {
+    return (int) explode('.', Version::id())[0];
+  }
+
+}