fix envelope tests

This instantiates an actual Envelope object instead of a Mock object
for use in the tests for envelope commands. The tests then do not fail
when they hit implicit getters of the form envelope['From'].

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/commands/envelope_test.py b/tests/commands/envelope_test.py
index 37ea9eed..956e01e2 100644
--- a/tests/commands/envelope_test.py
+++ b/tests/commands/envelope_test.py
@@ -170,10 +170,10 @@ class TestSignCommand(unittest.TestCase):
     @staticmethod
     def _make_ui_mock():
         """Create a mock for the ui and envelope and return them."""
-        envelope = mock.Mock()
+        envelope = Envelope()
+        envelope['From'] = 'foo <foo@example.com>'
         envelope.sign = mock.sentinel.default
         envelope.sign_key = mock.sentinel.default
-        envelope.headers = {'From': ['foo <foo@example.com>']}
         ui = mock.Mock(current_buffer=mock.Mock(envelope=envelope))
         return envelope, ui