Sorry - I see. You mean for testUpdateDelete. 

The test was to see if I could insert a "_deleted":true key-value pair into the JSON document, update that document and then have it become deleted. This is a method of deleting documents in Cloudant/CouchDB; it's the only way to delete documents in bulk. (We don't yet have bulk uploads, however and not sure if we will...). 

Anyways, when "_deleted":true is added to the document and updated, this key-value pair is simply thrown away and the document is inserted into the database as the next revision of the document.