diff --git a/core/includes/common.inc b/core/includes/common.inc
index 668dc39..aa9a89f 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -5314,9 +5314,22 @@ function drupal_system_listing($mask, $directory, $key = 'name', $min_depth = 1)
   // themes as provided by a distribution. It is pristine in the same way that
   // the 'core/modules' directory is pristine for core; users should avoid
   // any modification by using the sites/all or sites/<domain> directories.
+  $profiles = array();
   $profile = drupal_get_profile();
-  if (file_exists("profiles/$profile/$directory")) {
-    $searchdir[] = "profiles/$profile/$directory";
+  // For SimpleTest to be able to test modules packaged together with a
+  // distribution we need to include the profile of the parent site (in which
+  // test runs are triggered).
+  $testing_profile = variable_get('simpletest_parent_profile', FALSE);
+  if ($testing_profile && $testing_profile != $profile) {
+    $profiles[] = $testing_profile;
+  }
+  // In case both profile directories contain the same extension, the actual
+  // profile always has precedence.
+  $profiles[] = $profile;
+  foreach ($profiles as $profile) {
+    if (file_exists("profiles/$profile/$directory")) {
+      $searchdir[] = "profiles/$profile/$directory";
+    }
   }
 
   // Always search sites/all/* as well as the global directories.
diff --git a/core/modules/simpletest/drupal_web_test_case.php b/core/modules/simpletest/drupal_web_test_case.php
index 8168257..6db8013 100644
--- a/core/modules/simpletest/drupal_web_test_case.php
+++ b/core/modules/simpletest/drupal_web_test_case.php
@@ -1372,6 +1372,12 @@ class DrupalWebTestCase extends DrupalTestCase {
     variable_set('file_private_path', $private_files_directory);
     variable_set('file_temporary_path', $temp_files_directory);
 
+    // Set the 'simpletest_parent_profile' variable to add the parent profile's
+    // search path to the child site's search paths.
+    // @see drupal_system_listing()
+    // @todo This may need to be primed like 'install_profile' above.
+    variable_set('simpletest_parent_profile', $this->originalProfile);
+
     // Include the testing profile.
     variable_set('install_profile', $this->profile);
     $profile_details = install_profile_info($this->profile, 'en');
diff --git a/core/modules/simpletest/simpletest.test b/core/modules/simpletest/simpletest.test
index bd4427c..88c391b 100644
--- a/core/modules/simpletest/simpletest.test
+++ b/core/modules/simpletest/simpletest.test
@@ -616,3 +616,95 @@ class SimpleTestMissingCheckedRequirements extends DrupalWebTestCase {
     }
   }
 }
+
+/**
+ * Verifies that tests bundled with installation profile modules are found.
+ */
+class SimpleTestInstallationProfileModuleTestsTestCase extends DrupalWebTestCase {
+  /**
+   * Use the Testing profile.
+   *
+   * The Testing profile contains drupal_system_listing_compatible_test.test,
+   * which attempts to:
+   * - run tests using the Minimal profile (which does not contain the
+   *   drupal_system_listing_compatible_test.module)
+   * - but still install the drupal_system_listing_compatible_test.module
+   *   contained in the Testing profile.
+   *
+   * @see DrupalSystemListingCompatibleTestCase
+   */
+  protected $profile = 'testing';
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Installation profile module tests',
+      'description' => 'Verifies that tests bundled with installation profile modules are found.',
+      'group' => 'SimpleTest',
+    );
+  }
+
+  function setUp() {
+    parent::setUp(array('simpletest'));
+
+    $this->admin_user = $this->drupalCreateUser(array('administer unit tests'));
+    $this->drupalLogin($this->admin_user);
+  }
+
+  /**
+   * Tests existence of test case located in an installation profile module.
+   */
+  function testInstallationProfileTests() {
+    $this->drupalGet('admin/config/development/testing');
+    $this->assertText('Installation profile module tests helper');
+    $edit = array(
+      'DrupalSystemListingCompatibleTestCase' => TRUE,
+    );
+    $this->drupalPost(NULL, $edit, t('Run tests'));
+    $this->assertText('DrupalSystemListingCompatibleTestCase test executed.');
+  }
+}
+
+/**
+ * Verifies that tests in other installation profiles are not found.
+ *
+ * @see SimpleTestInstallationProfileModuleTestsTestCase
+ */
+class SimpleTestOtherInstallationProfileModuleTestsTestCase extends DrupalWebTestCase {
+  /**
+   * Use the Testing profile.
+   *
+   * The Testing profile contains drupal_system_listing_compatible_test.test,
+   * which attempts to:
+   * - run tests using the Minimal profile (which does not contain the
+   *   drupal_system_listing_compatible_test.module)
+   * - but still install the drupal_system_listing_compatible_test.module
+   *   contained in the Testing profile.
+   *
+   * @see SimpleTestInstallationProfileModuleTestsTestCase
+   * @see DrupalSystemListingCompatibleTestCase
+   */
+  protected $profile = 'minimal';
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Other Installation profiles',
+      'description' => 'Verifies that tests in other installation profiles are not found.',
+      'group' => 'SimpleTest',
+    );
+  }
+
+  function setUp() {
+    parent::setUp(array('simpletest'));
+
+    $this->admin_user = $this->drupalCreateUser(array('administer unit tests'));
+    $this->drupalLogin($this->admin_user);
+  }
+
+  /**
+   * Tests that tests located in another installation profile do not appear.
+   */
+  function testOtherInstallationProfile() {
+    $this->drupalGet('admin/config/development/testing');
+    $this->assertNoText('Installation profile module tests helper');
+  }
+}
diff --git a/profiles/testing/modules/drupal_system_listing_compatible_test/drupal_system_listing_compatible_test.info b/profiles/testing/modules/drupal_system_listing_compatible_test/drupal_system_listing_compatible_test.info
index 53515e7..9ce4ca1 100644
--- a/profiles/testing/modules/drupal_system_listing_compatible_test/drupal_system_listing_compatible_test.info
+++ b/profiles/testing/modules/drupal_system_listing_compatible_test/drupal_system_listing_compatible_test.info
@@ -4,3 +4,4 @@ package = Testing
 version = VERSION
 core = 8.x
 hidden = TRUE
+files[] = drupal_system_listing_compatible_test.test
diff --git a/profiles/testing/modules/drupal_system_listing_compatible_test/drupal_system_listing_compatible_test.test b/profiles/testing/modules/drupal_system_listing_compatible_test/drupal_system_listing_compatible_test.test
new file mode 100644
index 0000000..198c1d8
--- /dev/null
+++ b/profiles/testing/modules/drupal_system_listing_compatible_test/drupal_system_listing_compatible_test.test
@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * Helper to verify tests in installation profile modules.
+ */
+class DrupalSystemListingCompatibleTestCase extends DrupalWebTestCase {
+  /**
+   * 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';
+
+  public static function getInfo() {
+    return array(
+      'name' => 'Installation profile module tests helper',
+      'description' => 'Verifies that tests in installation profile modules are found and may use another profile for running tests.',
+      'group' => 'Installation profile',
+    );
+  }
+
+  function setUp() {
+    // Attempt to install a module in Testing profile, while this test runs with
+    // a different profile.
+    parent::setUp(array('drupal_system_listing_compatible_test'));
+  }
+
+  /**
+   * Non-empty test* method required to executed the test case class.
+   */
+  function testDrupalSystemListing() {
+    $this->pass(__CLASS__ . ' test executed.');
+  }
+}