11 files declare their use of SandboxEventException

ComposerMinimumStabilityValidatorTest.php in core/modules/package_manager/tests/src/Kernel/ComposerMinimumStabilityValidatorTest.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
DuplicateInfoFileValidatorTest.php in core/modules/package_manager/tests/src/Kernel/DuplicateInfoFileValidatorTest.php
PackageManagerKernelTestBase.php in core/modules/package_manager/tests/src/Kernel/PackageManagerKernelTestBase.php
PendingUpdatesValidatorTest.php in core/modules/package_manager/tests/src/Kernel/PendingUpdatesValidatorTest.php
PhpTufValidatorTest.php in core/modules/package_manager/tests/src/Kernel/PhpTufValidatorTest.php
SandboxManagerBase.php in core/modules/package_manager/src/SandboxManagerBase.php
StageEventsTest.php in core/modules/package_manager/tests/src/Kernel/StageEventsTest.php
StageLoggedOnErrorTest.php in core/modules/package_manager/tests/src/Kernel/StageLoggedOnErrorTest.php
SymlinkValidatorTest.php in core/modules/package_manager/tests/src/Kernel/SymlinkValidatorTest.php

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