42 files declare their use of WebTestBase

AggregatorTestBase.php in core/modules/aggregator/src/Tests/AggregatorTestBase.php
AjaxTestBase.php in core/modules/system/src/Tests/Ajax/AjaxTestBase.php
BlockContentTestBase.php in core/modules/block_content/src/Tests/BlockContentTestBase.php
BlockTestBase.php in core/modules/block/src/Tests/BlockTestBase.php
BrokenSetUpTest.php in core/modules/simpletest/src/Tests/BrokenSetUpTest.php
BrowserTest.php in core/modules/simpletest/src/Tests/BrowserTest.php
CacheTestBase.php in core/modules/system/src/Tests/Cache/CacheTestBase.php
CommentTestBase.php in core/modules/comment/src/Tests/CommentTestBase.php
ContentTranslationTestBase.php in core/modules/content_translation/src/Tests/ContentTranslationTestBase.php
DatabaseWebTestBase.php in core/modules/system/src/Tests/Database/DatabaseWebTestBase.php
DateTestBase.php in core/modules/datetime/src/Tests/DateTestBase.php
FieldTestBase.php in core/modules/field/src/Tests/FieldTestBase.php
FileFieldTestBase.php in core/modules/file/src/Tests/FileFieldTestBase.php
FileManagedTestBase.php in core/modules/file/src/Tests/FileManagedTestBase.php
ImageFieldTestBase.php in core/modules/image/src/Tests/ImageFieldTestBase.php
MenuTestBase.php in core/modules/system/src/Tests/Menu/MenuTestBase.php
MenuWebTestBase.php in core/modules/menu_ui/src/Tests/MenuWebTestBase.php
MissingCheckedRequirementsTest.php in core/modules/simpletest/src/Tests/MissingCheckedRequirementsTest.php
ModuleTestBase.php in core/modules/system/src/Tests/Module/ModuleTestBase.php
NodeTestBase.php in core/modules/node/src/Tests/NodeTestBase.php
PageCacheTagsTestBase.php in core/modules/system/src/Tests/Cache/PageCacheTagsTestBase.php
PathTestBase.php in core/modules/path/src/Tests/PathTestBase.php
RESTTestBase.php in core/modules/rest/src/Tests/RESTTestBase.php
SearchTestBase.php in core/modules/search/src/Tests/SearchTestBase.php
ShortcutTestBase.php in core/modules/shortcut/src/Tests/ShortcutTestBase.php
SimpleTestBrowserTest.php in core/modules/simpletest/src/Tests/SimpleTestBrowserTest.php
SimpleTestErrorCollectorTest.php in core/modules/simpletest/src/Tests/SimpleTestErrorCollectorTest.php
SimpleTestInstallBatchTest.php in core/modules/simpletest/src/Tests/SimpleTestInstallBatchTest.php
SimpleTestTest.php in core/modules/simpletest/src/Tests/SimpleTestTest.php
SkipRequiredModulesTest.php in core/modules/simpletest/src/Tests/SkipRequiredModulesTest.php
StatisticsTestBase.php in core/modules/statistics/src/Tests/StatisticsTestBase.php
SystemConfigFormTestBase.php in core/modules/system/src/Tests/System/SystemConfigFormTestBase.php
TaxonomyTestBase.php in core/modules/taxonomy/src/Tests/TaxonomyTestBase.php
TestDeprecatedTestHooks.php in core/modules/simpletest/tests/src/Kernel/TestDeprecatedTestHooks.php
TimeZoneTest.php in core/modules/simpletest/src/Tests/TimeZoneTest.php
ToolkitTestBase.php in core/modules/system/src/Tests/Image/ToolkitTestBase.php
TourTestBase.php in core/modules/tour/src/Tests/TourTestBase.php
UiPhpUnitOutputTest.php in core/modules/simpletest/src/Tests/UiPhpUnitOutputTest.php
UpdatePathTestBase.php in core/modules/system/src/Tests/Update/UpdatePathTestBase.php
UpdateTestBase.php in core/modules/update/src/Tests/UpdateTestBase.php
ViewTestBase.php in core/modules/views/src/Tests/ViewTestBase.php
WebTestBaseInstallTest.php in core/modules/simpletest/src/Tests/WebTestBaseInstallTest.php

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.