tests(test_views): use asserts rather than unittest's methods
tests(test_views): use asserts rather than unittest's methods

(since we using pytest, it is cleaner)

dsanders11/django-advanced-filters,modlinltd/django-advanced-filters,modlinltd/django-advanced-filters,dsanders11/django-advanced-filters,PreppyLLC-opensource/django-advanced-filters,PreppyLLC-opensource/django-advanced-filters,dsanders11/django-advanced-filters,modlinltd/django-advanced-filters,PreppyLLC-opensource/django-advanced-filters,dsanders11/django-advanced-filters