6 files declare their use of MenuLinkMock

MenuLinkTreeTest.php in core/modules/system/tests/src/Unit/Menu/MenuLinkTreeTest.php
MenuLinkTreeTest.php in core/tests/Drupal/KernelTests/Core/Menu/MenuLinkTreeTest.php
NavigationMenuBlockTest.php in core/modules/navigation/tests/src/Kernel/NavigationMenuBlockTest.php
NavigationMenuMarkupTest.php in core/modules/navigation/tests/src/Kernel/NavigationMenuMarkupTest.php
SystemMenuBlockTest.php in core/modules/system/tests/src/Kernel/Block/SystemMenuBlockTest.php
SystemMenuNavigationBlockTest.php in core/modules/navigation/tests/src/Kernel/SystemMenuNavigationBlockTest.php

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