with pytest.raises(ValueError):

        field.field_type()

def test_text_field_base():

    source = field_source(b's', b'string of text', 'Tx')

    field = fieldsmod.FormField(source)

    assert field.name() == 's'

    assert field.value() == b'string of text'

@pytest.mark.parametrize('value', ['Off', 'Yes', 'On'])

def test_checkbox_field_base(value):

    source = field_source(b'cb', value, 'Btn', literal=True)

    field = fieldsmod.FormField(source)

    assert field.name() == 'cb'

    assert field.value().name == value

@pytest.mark.parametrize('flags', range(4))

def test_readonly_flag(flags):

    source = field_source(flags=flags)

    parent = field.parent()

    assert parent is not None

    assert parent.name() == 'parent'

    assert not parent.is_terminal()

    assert field.is_terminal()

    assert field.name() == 'kid'

    assert field.value() == 'parent value'

    assert field.flags() == 17

    assert not list(field.kids())

@pytest.mark.parametrize('field_type,value', [

    ('Tx', b'new value'),