15 files declare their use of vfsStream in Zircon Profile 8.0

DrupalComponentTest.php in core/tests/Drupal/Tests/Component/DrupalComponentTest.php

Contains \Drupal\Tests\Component\DrupalComponentTest.

DrupalKernelTest.php in core/tests/Drupal/Tests/Core/DrupalKernel/DrupalKernelTest.php

Contains \Drupal\Tests\Core\DrupalKernel\DrupalKernelTest.

FileItemValidationTest.php in core/modules/file/tests/src/Kernel/FileItemValidationTest.php

Contains \Drupal\Tests\file\Kernel\FileItemValidationTest.

FileSystemTest.php in core/tests/Drupal/Tests/Core/File/FileSystemTest.php

Contains \Drupal\Tests\Core\File\FileSystemTest.

InfoParserUnitTest.php in core/tests/Drupal/Tests/Core/Extension/InfoParserUnitTest.php

Contains \Drupal\Tests\Core\Extension\InfoParserUnitTest.

KernelTestBase.php in core/tests/Drupal/KernelTests/KernelTestBase.php

Contains \Drupal\KernelTests\KernelTestBase.

KernelTestBaseTest.php in core/tests/Drupal/KernelTests/KernelTestBaseTest.php

Contains \Drupal\KernelTests\KernelTestBaseTest.

PermissionHandlerTest.php in core/modules/user/tests/src/Unit/PermissionHandlerTest.php

Contains \Drupal\Tests\user\Unit\PermissionHandlerTest.

PhpStorageTestBase.php in core/tests/Drupal/Tests/Component/PhpStorage/PhpStorageTestBase.php

Contains \Drupal\Tests\Component\PhpStorage\PhpStorageTestBase.

PhpTransliterationTest.php in core/tests/Drupal/Tests/Component/Transliteration/PhpTransliterationTest.php

Contains \Drupal\Tests\Component\Transliteration\PhpTransliterationTest.

UpdateRegistryTest.php in core/tests/Drupal/Tests/Core/Update/UpdateRegistryTest.php

Contains \Drupal\Tests\Core\Update\UpdateRegistryTest.

vfsStreamPrintVisitorTestCase.php in vendor/mikey179/vfsStream/src/test/php/org/bovigo/vfs/visitor/vfsStreamPrintVisitorTestCase.php

vfsStreamStructureVisitorTestCase.php in vendor/mikey179/vfsStream/src/test/php/org/bovigo/vfs/visitor/vfsStreamStructureVisitorTestCase.php

YamlDiscoveryTest.php in core/tests/Drupal/Tests/Component/Discovery/YamlDiscoveryTest.php

Contains \Drupal\Tests\Component\Discovery\YamlDiscoveryTest.

YamlDiscoveryTest.php in core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDiscoveryTest.php

Contains \Drupal\Tests\Core\Plugin\Discovery\YamlDiscoveryTest.