Do online tests against real shacache server.

slapos/libnetworkcachetests.py

-import unittest
-import tempfile
+import hashlib
 import os
+import random
+import tempfile
+import unittest
 from slapos.libnetworkcache import NetworkcacheClient
 from slapos.signature import parseArgument, \
                              createPrivateKeyAndCertificateFile
@@ -29,8 +31,24 @@ class OnlineTest(unittest.TestCase):
     nc.upload(content)
 
   def test_download(self):
+    # prepare some test data
+    test_data = tempfile.TemporaryFile()
+    test_string = str(random.random())
+    test_data.write(test_string)
+    test_data.seek(0)
+    shasum = hashlib.sha512(test_data.read()).hexdigest()
+    test_data.seek(0)
+
     nc = NetworkcacheClient(self.shacache, self.shadir)
-    nc.download('sha512sum')
+
+    # upload them
+    nc.upload(test_data)
+
+    # now try to download them
+    result = nc.download(shasum)
+
+    # is it correctly downloaded
+    self.assertEqual(result.read(), test_string)
 
 class LibNetworkCacheMixin(unittest.TestCase):