6 files declare their use of StaticDiscovery

DefaultsTestPluginManager.php in core/modules/system/tests/modules/plugin_test/src/Plugin/DefaultsTestPluginManager.php
MockBlockManager.php in core/modules/system/tests/modules/plugin_test/src/Plugin/MockBlockManager.php
StaticDiscoveryDecoratorTest.php in core/tests/Drupal/Tests/Component/Plugin/Discovery/StaticDiscoveryDecoratorTest.php
StaticDiscoveryTest.php in core/tests/Drupal/KernelTests/Core/Plugin/Discovery/StaticDiscoveryTest.php
TestPluginManager.php in core/modules/system/tests/modules/plugin_test/src/Plugin/TestPluginManager.php
TestPluginManager.php in core/tests/Drupal/Tests/Core/Plugin/TestPluginManager.php

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