tests: Fix Jinja2 test. Looks like Jinja is stripping rendered output, so now that we actually skip Jinja altogether when there's no `{` in the string, we need to adjust the tests.

language: python
python:
  - "3.4"
install:
  - "pip install -r requirements.txt"
  - "pip install -r dev-requirements.txt"
script: py.test