Clean up all modulestore testcases

Move modulestore config for tests to an importable location
Disable pylnt warning for lms imports in common tests
Refactor all testcases that loaded all xml courses
TE-610
TE-489

lms/djangoapps/courseware/tests/test_submitting_problems.py

@@ -2,41 +2,35 @@
 """
 Integration tests for submitting problem responses and getting grades.
 """
-# text processing dependencies
 import json
 import os
 from textwrap import dedent
 
-from mock import patch
-
 from django.conf import settings
 from django.contrib.auth.models import User
-from django.test.client import RequestFactory
 from django.core.urlresolvers import reverse
+from django.test.client import RequestFactory
 from django.test.utils import override_settings
+from mock import patch
 
-# Need access to internal func to put users in the right group
-from courseware import grades
-from courseware.models import StudentModule
-
-#import factories and parent testcase modules
-from xmodule.modulestore.tests.factories import CourseFactory, ItemFactory
-from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from capa.tests.response_xml_factory import (
     OptionResponseXMLFactory, CustomResponseXMLFactory, SchematicResponseXMLFactory,
     CodeResponseXMLFactory,
 )
+from courseware import grades
+from courseware.models import StudentModule
 from courseware.tests.helpers import LoginEnrollmentTestCase
-from courseware.tests.modulestore_config import TEST_DATA_MIXED_MODULESTORE
+from xmodule.modulestore.tests.django_utils import TEST_DATA_MOCK_MODULESTORE
 from lms.lib.xblock.runtime import quote_slashes
 from student.tests.factories import UserFactory
 from student.models import anonymous_id_for_user
-
+from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
+from xmodule.modulestore.tests.factories import CourseFactory, ItemFactory
 from xmodule.partitions.partitions import Group, UserPartition
 from user_api.tests.factories import UserCourseTagFactory
 
 
-@override_settings(MODULESTORE=TEST_DATA_MIXED_MODULESTORE)
+@override_settings(MODULESTORE=TEST_DATA_MOCK_MODULESTORE)
 class TestSubmittingProblems(ModuleStoreTestCase, LoginEnrollmentTestCase):
     """
     Check that a course gets graded properly.
@@ -651,6 +645,7 @@ class ProblemWithUploadedFilesTest(TestSubmittingProblems):
         self.assertItemsEqual(kwargs['files'].keys(), filenames.split())
 
 
+@override_settings(MODULESTORE=TEST_DATA_MOCK_MODULESTORE)
 class TestPythonGradedResponse(TestSubmittingProblems):
     """
     Check that we can submit a schematic and custom response, and it answers properly.