Move all sources mocks to the mocks.py module

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

mayan/apps/sources/tests/test_classes.py

@@ -9,6 +9,8 @@ from mayan.apps.storage.utils import mkdtemp
 
 from ..classes import StagingFile
 
+from .mocks import MockStagingFolder
+
 
 class StagingFileTestCase(BaseTestCase):
     def test_unicode_staging_file(self):
@@ -17,9 +19,6 @@ class StagingFileTestCase(BaseTestCase):
 
         filename = os.path.basename(TEST_NON_ASCII_DOCUMENT_PATH)
 
-        class MockStagingFolder(object):
-            self.folder_path = temporary_directory
-
         staging_file_1 = StagingFile(
             staging_folder=MockStagingFolder(),
             filename=filename