test for RecommenderXBlock

You have several tests that are calling this function to extend the `setUp` function. Why not simply move them to another class that inherits from this class, and extends it? For example:
```
class TestRecommender(ModuleStoreTestCase, LoginEnrollmentTestCase):
    def setUp(self):
        # do some useful things
        pass

    def test_one(self):
        # do a test that relies on TestRecommender.setUp
        pass

class TestRecommenderWithResources(TestRecommender):
    def setUp(self):
        # call the setUp function from the superclass
        super(TestRecommenderWithResources, self).setUp()
        # do more things to set up resources

    def test_two(self):
        # this test relies on TestRecommenderWithResources.setUp,
        # which does everything that TestRecommender.setUp does
        # and then some.
```