AJAXDialogTest::testDialog in core/modules/simpletest/tests/ajax.test

Test sending non-JS and AJAX requests to open and manipulate modals.

AJAXFrameworkTestCase::testAJAXRender in core/modules/simpletest/tests/ajax.test

Test that ajax_render() returns JavaScript settings generated during the page request.

AJAXFrameworkTestCase::testAJAXRenderError in core/modules/simpletest/tests/ajax.test

Test behavior of ajax_render_error().

DrupalWebTestCase::drupalGetAJAX in core/includes/drupal.classes.inc

FormsFormStorageTestCase::testImmutableFormLegacyProtection in core/modules/simpletest/tests/form.test

Verify that existing contrib code cannot overwrite immutable form state.