Test simplification

Unify usage of self.test_document and self.test_documents in
tests.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/document_parsing/tests/test_models.py

@@ -13,14 +13,14 @@ class DocumentAutoParsingTestCase(GenericDocumentTestCase):
 
     def test_disable_auto_parsing(self):
         self._create_document_type()
-        self.test_document = self.upload_document()
+        self.upload_document()
         with self.assertRaises(StopIteration):
             next(self.test_document.latest_version.content())
 
     @override_settings(DOCUMENT_PARSING_AUTO_PARSING=True)
     def test_enabled_auto_parsing(self):
         self._create_document_type()
-        self.test_document = self.upload_document()
+        self.upload_document()
         self.assertTrue(
             TEST_DOCUMENT_CONTENT in next(self.test_document.content())
         )