diff --git a/core/lib/Drupal/Core/Database/Database.php b/core/lib/Drupal/Core/Database/Database.php
index a799926..55f3501 100644
--- a/core/lib/Drupal/Core/Database/Database.php
+++ b/core/lib/Drupal/Core/Database/Database.php
@@ -443,4 +443,79 @@ public static function closeConnection($target = NULL, $key = NULL) {
   public static function ignoreTarget($key, $target) {
     self::$ignoreTargets[$key][$target] = TRUE;
   }
+
+  /**
+   * Converts a URL to a database connection info array.
+   *
+   * @param string $url
+   *   The URL.
+   *
+   * @return array
+   *   The database connection info.
+   */
+  public static function convertDbUrlToConnectionInfo($url) {
+    $info = parse_url($url);
+    if (!isset($info['scheme'], $info['host'], $info['path'])) {
+      throw new \InvalidArgumentException('Invalid --dburl. Minimum requirement: driver://host/database.');
+    }
+    $info += array(
+      'user' => '',
+      'pass' => '',
+      'fragment' => '',
+    );
+    if ($info['path'][0] === '/') {
+      $info['path'] = substr($info['path'], 1);
+    }
+    if ($info['scheme'] === 'sqlite' && $info['path'][0] !== '/') {
+      $info['path'] = DRUPAL_ROOT . '/' . $info['path'];
+    }
+    $database = array(
+      'driver' => $info['scheme'],
+      'username' => $info['user'],
+      'password' => $info['pass'],
+      'host' => $info['host'],
+      'database' => $info['path'],
+    );
+    if (isset($info['port'])) {
+      $database['port'] = $info['port'];
+    }
+    return $database;
+  }
+
+  /**
+   * Gets database connection info as a URL.
+   *
+   * @param string $key
+   *   The database connection key.
+   *
+   * @return string
+   *   The connection info as a URL.
+   */
+  public static function getConnectionInfoAsUrl($key = 'default') {
+    $db_info = static::getConnectionInfo($key);
+    if ($db_info['default']['driver'] == 'sqlite') {
+      $db_url = $db_info['default']['driver'] . '://localhost/' . $db_info['default']['database'];
+    }
+    else {
+      $user = '';
+      if ($db_info['default']['username']) {
+        $user = $db_info['default']['username'];
+        if ($db_info['default']['password']) {
+          $user .= ':' . $db_info['default']['password'];
+        }
+        $user .= '@';
+      }
+
+      $db_url = $db_info['default']['driver'] . '://' . $user . $db_info['default']['host'];
+      if (isset($db_info['default']['port'])) {
+        $db_url .= ':' . $db_info['default']['port'];
+      }
+      $db_url .= '/' . $db_info['default']['database'];
+    }
+    if ($db_info['default']['prefix']['default']) {
+      $db_url .= '#' . $db_info['default']['prefix']['default'];
+    }
+    return $db_url;
+  }
+
 }
diff --git a/core/modules/simpletest/simpletest.module b/core/modules/simpletest/simpletest.module
index 45c8c54..327ff51 100644
--- a/core/modules/simpletest/simpletest.module
+++ b/core/modules/simpletest/simpletest.module
@@ -240,30 +240,7 @@ function simpletest_phpunit_configuration_filepath() {
 function simpletest_phpunit_run_command(array $unescaped_test_classnames, $phpunit_file) {
   // Set the up an environment variable containing the database connection so
   // that functional tests can connect to the database.
-  $db_info = Database::getConnectionInfo();
-  if ($db_info['default']['driver'] == 'sqlite') {
-    $db_url = $db_info['default']['driver'] . '://localhost/' . $db_info['default']['database'];
-  }
-  else {
-    $user = '';
-    if ($db_info['default']['username']) {
-      $user = $db_info['default']['username'];
-      if ($db_info['default']['password']) {
-        $user .= ':' . $db_info['default']['password'];
-      }
-      $user .= '@';
-    }
-
-    $db_url = $db_info['default']['driver'] . '://' . $user . $db_info['default']['host'];
-    if (isset($db_info['default']['port'])) {
-      $db_url .= ':' . $db_info['default']['port'];
-    }
-    $db_url .= '/' . $db_info['default']['database'];
-  }
-  if ($db_info['default']['prefix']['default']) {
-    $db_url .= '#' . $db_info['default']['prefix']['default'];
-  }
-  putenv('SIMPLETEST_DB=' . $db_url);
+  putenv('SIMPLETEST_DB=' . Database::getConnectionInfoAsUrl());
   $phpunit_bin = simpletest_phpunit_command();
 
   $command = array(
diff --git a/core/modules/simpletest/src/BrowserTestBase.php b/core/modules/simpletest/src/BrowserTestBase.php
index e5643cc..c8aa69b 100644
--- a/core/modules/simpletest/src/BrowserTestBase.php
+++ b/core/modules/simpletest/src/BrowserTestBase.php
@@ -1064,31 +1064,7 @@ private function changeDatabasePrefix() {
     // If the test is run with argument dburl then use it.
     $db_url = getenv('SIMPLETEST_DB');
     if (!empty($db_url)) {
-      $info = parse_url($db_url);
-      if (!isset($info['scheme'], $info['host'], $info['path'])) {
-        throw new \InvalidArgumentException('Invalid --dburl. Minimum requirement: driver://host/database.');
-      }
-      $info += array(
-        'user' => '',
-        'pass' => '',
-        'fragment' => '',
-      );
-      if ($info['path'][0] === '/') {
-        $info['path'] = substr($info['path'], 1);
-      }
-      if ($info['scheme'] === 'sqlite' && $info['path'][0] !== '/') {
-        $info['path'] = DRUPAL_ROOT . '/' . $info['path'];
-      }
-      $database = array(
-        'driver' => $info['scheme'],
-        'username' => $info['user'],
-        'password' => $info['pass'],
-        'host' => $info['host'],
-        'database' => $info['path'],
-      );
-      if (isset($info['port'])) {
-        $database['port'] = $info['port'];
-      }
+      $database = Database::convertDbUrlToConnectionInfo($db_url);
       Database::addConnectionInfo('default', 'default', $database);
     }
 
diff --git a/core/scripts/run-tests.sh b/core/scripts/run-tests.sh
index 6e9a950..209e237 100644
--- a/core/scripts/run-tests.sh
+++ b/core/scripts/run-tests.sh
@@ -413,35 +413,12 @@ function simpletest_script_setup_database($new = FALSE) {
   if (!empty($args['dburl'])) {
     // Remove a possibly existing default connection (from settings.php).
     Database::removeConnection('default');
-
-    $info = parse_url($args['dburl']);
-    if (!isset($info['scheme'], $info['host'], $info['path'])) {
-      simpletest_script_print_error('Invalid --dburl. Minimum requirement: driver://host/database');
-      exit(1);
-    }
-    $info += array(
-      'user' => '',
-      'pass' => '',
-      'fragment' => '',
-    );
-    if ($info['path'][0] === '/') {
-      $info['path'] = substr($info['path'], 1);
-    }
-    if ($info['scheme'] === 'sqlite' && $info['path'][0] !== '/') {
-      $info['path'] = DRUPAL_ROOT . '/' . $info['path'];
+    try {
+      $databases['default']['default'] = Database::convertDbUrlToConnectionInfo($args['dburl']);
     }
-    $databases['default']['default'] = array(
-      'driver' => $info['scheme'],
-      'username' => $info['user'],
-      'password' => $info['pass'],
-      'host' => $info['host'],
-      'database' => $info['path'],
-      'prefix' => array(
-        'default' => $info['fragment'],
-      ),
-    );
-    if (isset($info['port'])) {
-      $databases['default']['default']['port'] = $info['port'];
+    catch (\InvalidArgumentException $e) {
+      simpletest_script_print_error('Invalid --dburl. Reason: ' . $e->getMessage());
+      exit(1);
     }
   }
   // Otherwise, use the default database connection from settings.php.