objFromFixture(File::class, 'asdf');
$subfolderfile1 = $this->objFromFixture(File::class, 'subfolderfile1');
$field->setValue(implode(',', [$asdf->ID, $subfolderfile1->ID]));
$readonlyField = $field->performReadonlyTransformation();
$this->assertEquals(
<<<"HTML"
<Special & characters>, TestFile1InSubfolder
HTML
,
(string)$readonlyField->Field()
);
}
}