6 string references to environment_cleaner in Drupal 8

DeprecatedCleanupTest::register in core/modules/simpletest/tests/src/Kernel/DeprecatedCleanupTest.php

Registers test-specific services.

SimpletestResultsForm::create in core/modules/simpletest/src/Form/SimpletestResultsForm.php

Instantiates a new instance of this class.

simpletest_clean_database in core/modules/simpletest/simpletest.module

Removes prefixed tables from the database from crashed tests.

simpletest_clean_environment in core/modules/simpletest/simpletest.module

Removes all temporary database tables and directories.

simpletest_clean_results_table in core/modules/simpletest/simpletest.module

Clears the test result tables.

simpletest_clean_temporary_directories in core/modules/simpletest/simpletest.module

Finds all leftover temporary directories and removes them.