Add file caching tests

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

mayan/apps/file_caching/tests/test_models.py

@@ -0,0 +1,18 @@
+from __future__ import unicode_literals
+
+from mayan.apps.common.tests import BaseTestCase
+
+from .mixins import CacheTestMixin
+
+
+class CacheModelTestCase(CacheTestMixin, BaseTestCase):
+    def test_cache_purge(self):
+        self._create_test_cache()
+        self._create_test_cache_partition()
+        self._create_test_cache_partition_file()
+
+        cache_total_size = self.test_cache.get_total_size()
+
+        self.test_cache.purge()
+
+        self.assertNotEqual(cache_total_size, self.test_cache.get_total_size())