6 files declare their use of InstalledPackagesList

ComposerInspectorTest.php in core/modules/package_manager/tests/src/Kernel/ComposerInspectorTest.php
FixtureManipulatorTest.php in core/modules/package_manager/tests/src/Kernel/FixtureManipulatorTest.php
InstalledPackagesListTest.php in core/modules/package_manager/tests/src/Unit/InstalledPackagesListTest.php
InstalledPackagesListTest.php in core/modules/package_manager/tests/src/Kernel/InstalledPackagesListTest.php
InstalledPackagesListTrait.php in core/modules/package_manager/tests/src/Traits/InstalledPackagesListTrait.php
LockFileValidatorTest.php in core/modules/package_manager/tests/src/Kernel/LockFileValidatorTest.php

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