chore: add tests

Author: mxschll

src/__tests__/functional-tests/test-utils.test.tsx

@@ -11,7 +11,7 @@ import { pascalCase } from 'change-case';
 
 import { clearVisualRefreshState } from '@cloudscape-design/component-toolkit/internal/testing';
 
-import { Modal } from '../../../lib/components';
+import { Dropdown, Modal } from '../../../lib/components';
 import Button from '../../../lib/components/button';
 import createWrapperDom, { ElementWrapper as DomElementWrapper } from '../../../lib/components/test-utils/dom';
 import createWrapperSelectors from '../../../lib/components/test-utils/selectors';
@@ -249,3 +249,37 @@ describe.each(componentWithMultipleRootElements)('ElementWrapper selectors for %
     });
   });
 });
+
+describe('DropdownWrapper test-utils', () => {
+  test('findOpenDropdown returns null when dropdown is closed', () => {
+    const { container } = renderTestingLibrary(
+      <Dropdown trigger={<button />} open={false} content={<div>content</div>} />
+    );
+    const wrapper = createWrapperDom(container).findDropdown()!;
+    expect(wrapper.findOpenDropdown()).toBeNull();
+  });
+
+  test('findOpenDropdown returns the open dropdown element when open', () => {
+    const { container } = renderTestingLibrary(
+      <Dropdown trigger={<button />} open={true} content={<div>content</div>} />
+    );
+    const wrapper = createWrapperDom(container).findDropdown()!;
+    expect(wrapper.findOpenDropdown()).not.toBeNull();
+  });
+
+  test('findOpenDropdown with expandToViewport finds portaled dropdown', () => {
+    const { container } = renderTestingLibrary(
+      <Dropdown trigger={<button />} open={true} expandToViewport={true} content={<div>content</div>} />
+    );
+    const wrapper = createWrapperDom(container).findDropdown()!;
+    expect(wrapper.findOpenDropdown({ expandToViewport: true })).not.toBeNull();
+  });
+
+  test('findOpenDropdown with expandToViewport returns null when closed', () => {
+    const { container } = renderTestingLibrary(
+      <Dropdown trigger={<button />} open={false} expandToViewport={true} content={<div>content</div>} />
+    );
+    const wrapper = createWrapperDom(container).findDropdown()!;
+    expect(wrapper.findOpenDropdown({ expandToViewport: true })).toBeNull();
+  });
+});