Yes. Imagine that you have never seen this code before and you want to extending, fix it, or simply read it to understand and none of the original developers are involved in the project anymore (i.e. you have no one to ask questions about the code). As it stands there is no indication of what model this test represents nor what the variables may mean. I think you should add enough information to the doc string and comments that someone else can understand the code simply by reading it.