Add a unit test to manager for storage username.

Author: FernandoOjeda

tests/managers/hardware_tests.py

@@ -845,6 +845,13 @@ def test_authorize_storage(self):
         options = self.hardware.authorize_storage(1234, "SL01SEL301234-11")
 
         self.assertEqual(True, options)
+    
+    def test_authorize_storage_empty(self):
+        mock = self.set_mock('SoftLayer_Account', 'getNetworkStorage')
+        mock.return_value = []
+        self.assertRaises(SoftLayer.exceptions.SoftLayerError,
+                          self.hardware.authorize_storage,
+                          1234, "#")
 
 
 class HardwareHelperTests(testing.TestCase):