service cache.backend.memory

DrupalKernelTest::setUp in drupal/core/modules/system/lib/Drupal/system/Tests/DrupalKernel/DrupalKernelTest.php

Sets up unit test environment.

DrupalUnitTestBase::containerBuild in drupal/core/modules/simpletest/lib/Drupal/simpletest/DrupalUnitTestBase.php

Sets up the base service container for this test.

update_prepare_d8_bootstrap in drupal/core/includes/update.inc

Performs extra steps required to bootstrap when using a Drupal 7 database.

WebTestBase::setUp in drupal/core/modules/simpletest/lib/Drupal/simpletest/WebTestBase.php

Sets up a Drupal site for running functional and integration tests.

class: Drupal\Core\Cache\MemoryBackendFactory