7 files declare their use of OffCanvasTestTrait

AjaxBlockTest.php in core/modules/layout_builder/tests/src/FunctionalJavascript/AjaxBlockTest.php
ContentPreviewToggleTest.php in core/modules/layout_builder/tests/src/FunctionalJavascript/ContentPreviewToggleTest.php
LayoutBuilderDisableInteractionsTest.php in core/modules/layout_builder/tests/src/FunctionalJavascript/LayoutBuilderDisableInteractionsTest.php
LayoutBuilderTest.php in core/modules/layout_builder/tests/src/FunctionalJavascript/LayoutBuilderTest.php
NavigationBlockUiTest.php in core/modules/navigation/tests/src/FunctionalJavascript/NavigationBlockUiTest.php
OffCanvasTestBase.php in core/modules/system/tests/src/FunctionalJavascript/OffCanvasTestBase.php
WorkspacesLayoutBuilderIntegrationTest.php in core/modules/workspaces/tests/src/FunctionalJavascript/WorkspacesLayoutBuilderIntegrationTest.php

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