8 string references to YAML keys in test_htmx.routing.yml

HtmxRendererTest::testHtmxRouteOption in core/tests/Drupal/KernelTests/Core/Htmx/HtmxRendererTest.php
Test triggering the renderer with the _htmx_route option.
HtmxRendererTest::testWrapperFormat in core/tests/Drupal/KernelTests/Core/Htmx/HtmxRendererTest.php
Test triggering the renderer with _wrapper_format.
HtmxRequestTest::setUp in core/tests/Drupal/KernelTests/Core/Htmx/HtmxRequestTest.php
HtmxRequestTest::testHxRequest in core/tests/Drupal/KernelTests/Core/Htmx/HtmxRequestTest.php
Test all 5 request verb methods.
HtmxTestAttachmentsController::generateHtmxButton in core/modules/system/tests/modules/test_htmx/src/Controller/HtmxTestAttachmentsController.php
Static helper to for reusable render array.
HtmxTestAttachmentsController::selectBody in core/modules/system/tests/modules/test_htmx/src/Controller/HtmxTestAttachmentsController.php
Tests body targeting and swapping.
HtmxTestForm::buildForm in core/modules/system/tests/modules/test_htmx/src/Form/HtmxTestForm.php
Form constructor.
TestHtmxHooks::boost in core/modules/system/tests/modules/test_htmx/src/Hook/TestHtmxHooks.php
Implements hook_preprocess_HOOK() for html.

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