Test - Email

When setting up emails with the send mail action, I all time struggle, because inserting placeholders often end up as being changed to strings and not being a placeholder anymore with an HTML email. Now I need to clean out HTML and to test I always have to start the action (scheduled or triggered) this is time-consuming. 

I wish the HTML editor would be better. At the WYSIWYG editor, adding placeholders for SP list fields and URLs to list forms with IDs should be improved. And a feature to send test emails without the need to run the entire actions would also be nice.