diff --git a/.gitignore b/.gitignore
index a68c28d..98c9c5a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,4 @@ interfaces
 trusty
 .testrepository
 __pycache__
+.stestr
diff --git a/src/layer.yaml b/src/layer.yaml
index ed5e90e..cb07dcb 100644
--- a/src/layer.yaml
+++ b/src/layer.yaml
@@ -1,3 +1,6 @@
 includes: ['layer:openstack', 'interface:barbican-hsm']
 repo: https://github.com/openstack/charm-barbican-softhsm
-
+options:
+  basic:
+    use_venv: true
+    include_system_packages: true
diff --git a/unit_tests/test_lib_barbican_softhsm.py b/unit_tests/test_lib_barbican_softhsm.py
index 404b3ba..f4f4d43 100644
--- a/unit_tests/test_lib_barbican_softhsm.py
+++ b/unit_tests/test_lib_barbican_softhsm.py
@@ -47,8 +47,8 @@ class TestSoftHSM(test_utils.PatchHelper):
         # test with no file (patch open so that it raises an error)
         mock_open = mock.MagicMock(return_value=mock.sentinel.file_handle)
         with mock.patch('builtins.open', mock_open):
-            def raise_exception():
-                raise Exception("Supposed to break")
+            def raise_exception(*args):
+                raise OSError("Supposed to break")
             mock_open.side_effect = raise_exception
             pin, so_pin = softhsm.read_pins_from_store()
             self.assertEqual(pin, None)