add unit tests

tests/components/Dropdown.test.tsx

@@ -52,4 +52,9 @@ describe('Dropdown', () => {
         expect(select).toHaveClass('custom-select');
         expect(screen.getByText('Role').closest('label')).toHaveClass('custom-wrapper');
     });
+
+    it('supports rendering without a label', () => {
+        const { container } = render(<Dropdown value="USER" choices={choices} />);
+        expect(container.querySelector('label > span')).toBeNull();
+    });
 });