Merge pull request #2142 from dnephin/fix_error_cant_connect

Fix error when compose can't connect to docker

tests/unit/cli/command_test.py

@@ -0,0 +1,22 @@
+from __future__ import absolute_import
+
+import pytest
+from requests.exceptions import ConnectionError
+
+from compose.cli import errors
+from compose.cli.command import friendly_error_message
+from tests import mock
+from tests import unittest
+
+
+class FriendlyErrorMessageTestCase(unittest.TestCase):
+
+    def test_dispatch_generic_connection_error(self):
+        with pytest.raises(errors.ConnectionErrorGeneric):
+            with mock.patch(
+                'compose.cli.command.call_silently',
+                autospec=True,
+                side_effect=[0, 1]
+            ):
+                with friendly_error_message():
+                    raise ConnectionError()