1 files changed, 31 insertions, 0 deletions
diff --git a/tests/test_ssh_exception.py b/tests/test_ssh_exception.py
new file mode 100644
index 00000000..18f2a97d
--- /dev/null
+++ b/tests/test_ssh_exception.py
@@ -0,0 +1,31 @@
+import pickle
+import unittest
+
+from paramiko.ssh_exception import NoValidConnectionsError
+
+
+class NoValidConnectionsErrorTest (unittest.TestCase):
+
+    def test_pickling(self):
+        # Regression test for https://github.com/paramiko/paramiko/issues/617
+        exc = NoValidConnectionsError({('127.0.0.1', '22'): Exception()})
+        new_exc = pickle.loads(pickle.dumps(exc))
+        self.assertEqual(type(exc), type(new_exc))
+        self.assertEqual(str(exc), str(new_exc))
+        self.assertEqual(exc.args, new_exc.args)
+
+    def test_error_message_for_single_host(self):
+        exc = NoValidConnectionsError({('127.0.0.1', '22'): Exception()})
+        assert "Unable to connect to port 22 on 127.0.0.1" in str(exc)
+
+    def test_error_message_for_two_hosts(self):
+        exc = NoValidConnectionsError({('127.0.0.1', '22'): Exception(),
+                                       ('::1', '22'): Exception()})
+        assert "Unable to connect to port 22 on 127.0.0.1 or ::1" in str(exc)
+
+    def test_error_message_for_multiple_hosts(self):
+        exc = NoValidConnectionsError({('127.0.0.1', '22'): Exception(),
+                                       ('::1', '22'): Exception(),
+                                       ('10.0.0.42', '22'): Exception()})
+        exp = "Unable to connect to port 22 on 10.0.0.42, 127.0.0.1 or ::1"
+        assert exp in str(exc)