Hi Antoine,

I have code that adds a comment to a work item.  I've poked around it, and it looks like you could do something like the following before saving the work item with a new comment:

IComments comments= workItem.getComments();

int numberOfComments = comments.getContents().length;

Then after you save the work item, you could check that contents[numberOfComments].toString() is your comment.

I don't have an environment setup to see if getContents() is returning what I expect it will, so hopefully that will work for you (or at least get you started).