Data-Test attributes don't work

[lookininward]

      {{fm-field
        widget='input'
        label='This is a label'
        placeholder='This is a placeholder'
        class='myInput'
        value=form.name.value
        errors=form.error.value
        data-test-input='name'
      }}

No matter which position I place the data-test attribute, and no matter which syntax I use for it, it is never rendered in the DOM when actually running the tests.