Remove try/except/import for SimpleTestCase

Author: pelme

pytest_django/django_compat.py

@@ -4,14 +4,11 @@
 
 def is_django_unittest(request_or_item):
     """Returns True if the request_or_item is a Django test case, otherwise False"""
-    try:
-        from django.test import SimpleTestCase as TestCase
-    except ImportError:
-        from django.test import TestCase
+    from django.test import SimpleTestCase
 
     cls = getattr(request_or_item, 'cls', None)
 
     if cls is None:
         return False
 
-    return issubclass(cls, TestCase)
+    return issubclass(cls, SimpleTestCase)