In the dynamic content example; with the previous showing one item and the second screen shot showing two items, what is it about the DOM structure that makes this a passing test? How do you know that the functionality wasn't suppose to update an item?

Wouldn't you at least need three tests; an initial test to show that an item is inserted into the DOM, a second test to demonstrate that the system is inserting, not updating an item, and then finally your third test that demonstrates the functionality continues to insert into the DOM?