SomeClass.php

1. 8.x drupal/core/vendor/phpunit/phpunit-mock-objects/Tests/_files/SomeClass.php
2. 8.x drupal/core/modules/system/tests/modules/module_autoload_test/lib/Drupal/module_autoload_test/SomeClass.php
3. 8.x drupal/core/vendor/symfony/class-loader/Symfony/Component/ClassLoader/Tests/Fixtures/classmap/SomeClass.php

<?php

/**
 * @file
 * Definition of Drupal\module_autoload_test\SomeClass.
 */
namespace Drupal\module_autoload_test;

class SomeClass {
  function testMethod() {
    return 'Drupal\\module_autoload_test\\SomeClass::testMethod() was invoked.';
  }

}