15 files declare their use of ActiveFixtureManipulator

AllowedScaffoldPackagesValidatorTest.php in core/modules/package_manager/tests/src/Kernel/AllowedScaffoldPackagesValidatorTest.php
ChangeLoggerTest.php in core/modules/package_manager/tests/src/Kernel/ChangeLoggerTest.php
ComposerInspectorTest.php in core/modules/package_manager/tests/src/Kernel/ComposerInspectorTest.php
ComposerPatchesValidatorTest.php in core/modules/package_manager/tests/src/Kernel/ComposerPatchesValidatorTest.php
ComposerPluginsValidatorInsecureTest.php in core/modules/package_manager/tests/src/Kernel/ComposerPluginsValidatorInsecureTest.php
ComposerPluginsValidatorTestBase.php in core/modules/package_manager/tests/src/Kernel/ComposerPluginsValidatorTestBase.php
ComposerValidatorTest.php in core/modules/package_manager/tests/src/Kernel/ComposerValidatorTest.php
EnabledExtensionsValidatorTest.php in core/modules/package_manager/tests/src/Kernel/EnabledExtensionsValidatorTest.php
FakeSiteFixtureTest.php in core/modules/package_manager/tests/src/Kernel/FakeSiteFixtureTest.php
FixtureManipulatorTest.php in core/modules/package_manager/tests/src/Kernel/FixtureManipulatorTest.php
GitExcluderTest.php in core/modules/package_manager/tests/src/Kernel/PathExcluder/GitExcluderTest.php
InstalledPackagesListTest.php in core/modules/package_manager/tests/src/Kernel/InstalledPackagesListTest.php
OverwriteExistingPackagesValidatorTest.php in core/modules/package_manager/tests/src/Kernel/OverwriteExistingPackagesValidatorTest.php
PhpTufValidatorTest.php in core/modules/package_manager/tests/src/Kernel/PhpTufValidatorTest.php
SupportedReleaseValidatorTest.php in core/modules/package_manager/tests/src/Kernel/SupportedReleaseValidatorTest.php

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