simpletest.settings.yml

DrupalKernel::moduleData in drupal/core/lib/Drupal/Core/DrupalKernel.php

Returns module data on the filesystem.

simpletest_settings_form in drupal/core/modules/simpletest/simpletest.pages.inc

Provides settings form for SimpleTest variables.

simpletest_update_8000 in drupal/core/modules/simpletest/simpletest.install

Move simpletest settings from variables to config.

TestBase::run in drupal/core/modules/simpletest/lib/Drupal/simpletest/TestBase.php

Run all tests in this class.

clear_results: '1'
httpauth:
  method: '1'
  password: ''
  username: ''
verbose: '1'