We should change these links to local links so that we're not hitting the columbia.edu servers every time we run the tests. I'd suggest we create a `static/tests` directory where we can put some sample images.  Then in the test itself, the link will look like `http://localhost:8000/static/tests/my-test-image.jpg`. The only issue with this change is that the test will only work if the local server is running, but at least it won't be hitting remote servers every time the tests are run.