Test Improvements - 2

Remove unmaintained flask testing library and improve tests speed by clearing
tables instead of dropping and recreating them between each test. These
changes also help in upgrading the other flask dependencies.

critiquebrainz/data/testing.py

@@ -1,24 +1,5 @@
-import os
+from critiquebrainz.frontend.testing import FrontendTestCase
 
-from flask_testing import TestCase
 
-from critiquebrainz.data.utils import create_all, drop_tables, drop_types, clear_tables
-from critiquebrainz.frontend import create_app
-
-
-class DataTestCase(TestCase):
-
-    def create_app(self):
-        app = create_app(config_path=os.path.join(os.path.dirname(os.path.realpath(__file__)), '..', '..', 'test_config.py'))
-        return app
-
-    def setUp(self):
-        self.reset_db()
-        # TODO(roman): Add stuff form fixtures.
-
-    def tearDown(self):
-        pass
-
-    @staticmethod
-    def reset_db():
-        clear_tables()
+class DataTestCase(FrontendTestCase):
+    pass

critiquebrainz/frontend/views/test/test_bb_author.py

@@ -6,6 +6,7 @@
 from critiquebrainz.db.user import User
 from critiquebrainz.frontend.testing import FrontendTestCase
 
+
 class AuthorViewsTestCase(FrontendTestCase):
 
     def setUp(self):