Make TWBlue to respect persist_size when loading the cache database. Added tests for both reading from disk and loading in memory caches

src/run_tests.py

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+import unittest
+
+testmodules = ["test.test_cache"]
+
+suite = unittest.TestSuite()
+
+for t in testmodules:
+    try:
+        # If the module defines a suite() function, call it to get the suite.
+        mod = __import__(t, globals(), locals(), ['suite'])
+        suitefn = getattr(mod, 'suite')
+        suite.addTest(suitefn())
+    except (ImportError, AttributeError):
+        # else, just load all the test cases from the module.
+        suite.addTest(unittest.defaultTestLoader.loadTestsFromName(t))
+
+unittest.TextTestRunner(verbosity=2).run(suite)