Fix failing test

Django was looking for a Jinja template in the Django template directory
because the `DIR` value was kept.

Author: HiPhish

tests/test_nav.py

@@ -158,12 +158,10 @@ def test_get_template_engines(engine, expected):
     class TemplateEngineNav(Nav):
         template_name = (
             "tests/dummy_nav.html"
-            if engine.endswith("DjangoTemplates")
-            else "tests/jinja2/dummy_nav.html"
         )
         items = [...]
 
-    with override_settings(TEMPLATES=[dict(settings.TEMPLATES[0], BACKEND=engine)]):
+    with override_settings(TEMPLATES=[dict(settings.TEMPLATES[0], BACKEND=engine, DIRS=[])]):
         template = TemplateEngineNav().get_template()
 
     assert isinstance(template, expected)