Issue #3522004 by catch: Consolidate list_string test cases in OptionsFieldUiTest

      ],

      'List string' => [

        'list_string',

        ['first' => 'First', 'second' => 'Second', 'third' => 'Third'],

        TRUE,

      ],

      // Example with empty key and label values like string '0'.

      'List string with 0 value' => [

        'list_string',

        ['0' => '0', '1' => '1', '2' => '2'],

        ['0' => '0', '1' => '1', 'two' => 'two'],

        TRUE,

      ],

    ];