interface EnvironmentCleanerInterface

interface EnvironmentCleanerInterface {
    
    /**
     * Removes all test-related database tables and directories.
     *
     * This method removes fixture files and database entries from the system
     * under test.
     *
     * @param bool $clear_results
     *   (optional) Whether to clear the test results storage. Defaults to TRUE.
     * @param bool $clear_temp_directories
     *   (optional) Whether to clear the test site directories. Defaults to TRUE.
     * @param bool $clear_database
     *   (optional) Whether to clean up the fixture database. Defaults to TRUE.
     */
    public function cleanEnvironment(bool $clear_results = TRUE, bool $clear_temp_directories = TRUE, bool $clear_database = TRUE) : void;
    
    /**
     * Remove database entries left over in the fixture database.
     */
    public function cleanDatabase() : void;
    
    /**
     * Finds all leftover fixture site directories and removes them.
     */
    public function cleanTemporaryDirectories() : void;
    
    /**
     * Clears test results from the results storage.
     *
     * @param \Drupal\Core\Test\TestRun $test_run
     *   The test run object to remove results for, or NULL to remove all
     *   results.
     *
     * @return int
     *   The number of results that were removed.
     */
    public function cleanResults(?TestRun $test_run = NULL) : int;

}