class DrupalUnitTestCase

class DrupalUnitTestCase extends DrupalTestCase {
    
    /**
     * Constructor for DrupalUnitTestCase.
     */
    function __construct($test_id = NULL) {
        parent::__construct($test_id);
        $this->skipClasses[__CLASS__] = TRUE;
    }
    
    /**
     * Sets up unit test environment.
     *
     * Unlike DrupalWebTestCase::setUp(), DrupalUnitTestCase::setUp() does not
     * install modules because tests are performed without accessing the database.
     * Any required files must be explicitly included by the child class setUp()
     * method.
     */
    protected function setUp() {
        global $conf, $language;
        // Store necessary current values before switching to the test environment.
        $this->originalFileDirectory = variable_get('file_public_path', conf_path() . '/files');
        $this->verboseDirectoryUrl = file_create_url($this->originalFileDirectory . '/simpletest/verbose');
        // Set up English language.
        $this->originalLanguage = $language;
        $this->originalLanguageDefault = variable_get('language_default');
        unset($conf['language_default']);
        $language = language_default();
        // Reset all statics so that test is performed with a clean environment.
        drupal_static_reset();
        // Generate temporary prefixed database to ensure that tests have a clean starting point.
        $this->databasePrefix = Database::getConnection()->prefixTables('{simpletest' . mt_rand(1000, 1000000) . '}');
        // Create test directory.
        $public_files_directory = $this->originalFileDirectory . '/simpletest/' . substr($this->databasePrefix, 10);
        file_prepare_directory($public_files_directory, FILE_CREATE_DIRECTORY | FILE_MODIFY_PERMISSIONS);
        $conf['file_public_path'] = $public_files_directory;
        // Clone the current connection and replace the current prefix.
        $connection_info = Database::getConnectionInfo('default');
        Database::renameConnection('default', 'simpletest_original_default');
        foreach ($connection_info as $target => $value) {
            $connection_info[$target]['prefix'] = array(
                'default' => $value['prefix']['default'] . $this->databasePrefix,
            );
        }
        Database::addConnectionInfo('default', 'default', $connection_info['default']);
        // Set user agent to be consistent with web test case.
        $_SERVER['HTTP_USER_AGENT'] = $this->databasePrefix;
        // If locale is enabled then t() will try to access the database and
        // subsequently will fail as the database is not accessible.
        $module_list = module_list();
        if (isset($module_list['locale'])) {
            // Transform the list into the format expected as input to module_list().
            foreach ($module_list as &$module) {
                $module = array(
                    'filename' => drupal_get_filename('module', $module),
                );
            }
            $this->originalModuleList = $module_list;
            unset($module_list['locale']);
            module_list(TRUE, FALSE, FALSE, $module_list);
        }
        $this->setup = TRUE;
    }
    protected function tearDown() {
        global $conf, $language;
        // Get back to the original connection.
        Database::removeConnection('default');
        Database::renameConnection('simpletest_original_default', 'default');
        $conf['file_public_path'] = $this->originalFileDirectory;
        // Restore modules if necessary.
        if (isset($this->originalModuleList)) {
            module_list(TRUE, FALSE, FALSE, $this->originalModuleList);
        }
        // Reset language.
        $language = $this->originalLanguage;
        if ($this->originalLanguageDefault) {
            $GLOBALS['conf']['language_default'] = $this->originalLanguageDefault;
        }
    }

}