public function testGetDatabaseCredentials()
{
chdir($this->drupal_root);
$creds = Drupal::get_database_credentials();
$this->assertEquals($creds['host'], 'drupal_database_host', 'database host should equal `drupal_database_host`');
$this->assertEquals($creds['database'], 'drupal_database_name', 'database name should equal `drupal_database_name`');
$this->assertEquals($creds['username'], 'drupal_database_user', 'database username should equal `drupal_database_user`');
$this->assertEquals($creds['password'], 'drupal_database_password', 'database name should equal `drupal_database_password`');
}