Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/profiles/testing/config/install/system.theme.yml

@@ -0,0 +1,2 @@
+# @todo: Remove this file in https://www.drupal.org/node/2352949
+default: classy

core/profiles/testing/config/optional/locale.settings.yml

@@ -0,0 +1,12 @@
+cache_strings: true
+javascript:
+  directory: languages
+translation:
+  use_source: remote_and_local
+  default_filename: '%project-%version.%language.po'
+  default_server_pattern: 'http://ftp.drupal.org/files/translations/%core/%project/%project-%version.%language.po'
+  overwrite_customized: false
+  overwrite_not_customized: true
+  update_interval_days: 0
+  path: ''
+  import_enabled: false

core/profiles/testing/modules/drupal_system_listing_compatible_test/drupal_system_listing_compatible_test.info.yml

@@ -0,0 +1,6 @@
+name: 'Drupal system listing compatible test'
+type: module
+description: 'Support module for testing the drupal_system_listing function.'
+package: Testing
+version: VERSION
+core: 8.x

core/profiles/testing/modules/drupal_system_listing_compatible_test/src/Tests/SystemListingCompatibleTest.php

@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\drupal_system_listing_compatible_test\Tests\SystemListingCompatibleTest.
+ */
+
+namespace Drupal\drupal_system_listing_compatible_test\Tests;
+
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Verifies that tests in installation profile modules are found and may use
+ * another profile for running tests.
+ *
+ * @group drupal_system_listing_compatible_test
+ */
+class SystemListingCompatibleTest extends WebTestBase {
+
+  /**
+   * Attempt to enable a module from the Testing profile.
+   *
+   * This test uses the Minimal profile, but enables a module from the Testing
+   * profile to confirm that a different profile can be used for running tests.
+   *
+   * @var array
+   */
+  public static $modules = array('drupal_system_listing_compatible_test');
+
+  /**
+   * Use the Minimal profile.
+   *
+   * This test needs to use a different installation profile than the test which
+   * asserts that this test is found.
+   *
+   * @see SimpleTestInstallationProfileModuleTestsTestCase
+   */
+  protected $profile = 'minimal';
+
+  /**
+   * Non-empty test* method required to executed the test case class.
+   */
+  function testSystemListing() {
+    $this->pass(__CLASS__ . ' test executed.');
+  }
+}

core/profiles/testing/testing.info.yml

@@ -0,0 +1,13 @@
+name: Testing
+type: profile
+description: 'Minimal profile for running tests. Includes absolutely required modules only.'
+version: VERSION
+core: 8.x
+hidden: true
+dependencies:
+  # Enable page_cache in testing, to ensure that as many tests as possible run
+  # with page caching enabled.
+  - page_cache
+# @todo: Remove this in https://www.drupal.org/node/2352949
+themes:
+  - classy