test for RecommenderXBlock

This method seems like needless indirection. It's doing an `assertEqual` on its arguments, and then also doing `self.check_for_get_xblock_page_code(200)`, which ignores the arguments passed to it. It might be clearer to just call both of these lines every place that you are currently referencing `check_result`, since the meaningful part of the function is only one line. If you disagree, though, I'm willing to be convinced.