First commit

modules/simpletest/tests/drupal_autoload_test/drupal_autoload_test.info

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+name = "Drupal code registry test"
+description = "Support module for testing the code registry."
+files[] = drupal_autoload_test_interface.inc
+files[] = drupal_autoload_test_class.inc
+package = Testing
+version = VERSION
+core = 7.x
+hidden = TRUE
+
+; Information added by Drupal.org packaging script on 2017-06-21
+version = "7.56"
+project = "drupal"
+datestamp = "1498069849"
+

modules/simpletest/tests/drupal_autoload_test/drupal_autoload_test.module

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+<?php
+
+/**
+ * @file
+ * Test module to check code registry.
+ */
+
+/**
+ * Implements hook_registry_files_alter().
+ */
+function drupal_autoload_test_registry_files_alter(&$files, $modules) {
+  foreach ($modules as $module) {
+    // Add the drupal_autoload_test_trait.sh file to the registry when PHP 5.4+
+    // is being used.
+    if ($module->name == 'drupal_autoload_test' && version_compare(PHP_VERSION, '5.4') >= 0) {
+      $files["$module->dir/drupal_autoload_test_trait.sh"] = array(
+        'module' => $module->name,
+        'weight' => $module->weight,
+      );
+    }
+  }
+}

modules/simpletest/tests/drupal_autoload_test/drupal_autoload_test_class.inc

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+<?php
+
+/**
+ * @file
+ * Test classes for code registry testing.
+ */
+
+/**
+ * This class is empty because we only care if Drupal can find it.
+ */
+class DrupalAutoloadTestClass implements DrupalAutoloadTestInterface {}

modules/simpletest/tests/drupal_autoload_test/drupal_autoload_test_interface.inc

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+<?php
+
+/**
+ * @file
+ * Test interfaces for code registry testing.
+ */
+
+/**
+ * This interface is empty because we only care if Drupal can find it.
+ */
+interface DrupalAutoloadTestInterface {}

modules/simpletest/tests/drupal_autoload_test/drupal_autoload_test_trait.sh

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+<?php
+
+/**
+ * @file
+ * Test traits for code registry testing.
+ *
+ * This file has a non-standard extension to prevent PHP < 5.4 testbots from
+ * trying to run a syntax check on it.
+ * @todo Use a standard extension once the testbots allow it. See
+ *   https://www.drupal.org/node/2589649.
+ */
+
+/**
+ * This trait is empty because we only care if Drupal can find it.
+ */
+trait DrupalAutoloadTestTrait {}