Add unittests and fix bugs

* Improved error messages
* Improved checking of user input

Signed-off-by: Jhon Honce <jhonce@redhat.com>

Closes: #978
Approved by: mheon

contrib/python/test/test_tunnel.py

@@ -0,0 +1,79 @@
+from __future__ import absolute_import
+
+import time
+import unittest
+from unittest.mock import MagicMock, patch
+
+import podman
+from podman.libs.tunnel import Context, Portal, Tunnel
+
+
+class TestTunnel(unittest.TestCase):
+    def setUp(self):
+        self.tunnel_01 = MagicMock(spec=Tunnel)
+        self.tunnel_02 = MagicMock(spec=Tunnel)
+
+    def test_portal_ops(self):
+        portal = Portal(sweap=500)
+        portal['unix:/01'] = self.tunnel_01
+        portal['unix:/02'] = self.tunnel_02
+
+        self.assertEqual(portal.get('unix:/01'), self.tunnel_01)
+        self.assertEqual(portal.get('unix:/02'), self.tunnel_02)
+
+        del portal['unix:/02']
+        with self.assertRaises(KeyError):
+            portal['unix:/02']
+        self.assertEqual(len(portal), 1)
+
+    def test_portal_reaping(self):
+        portal = Portal(sweap=0.5)
+        portal['unix:/01'] = self.tunnel_01
+        portal['unix:/02'] = self.tunnel_02
+
+        self.assertEqual(len(portal), 2)
+        for entry in portal:
+            self.assertIn(entry, (self.tunnel_01, self.tunnel_02))
+
+        time.sleep(1)
+        portal.reap()
+        self.assertEqual(len(portal), 0)
+
+    def test_portal_no_reaping(self):
+        portal = Portal(sweap=500)
+        portal['unix:/01'] = self.tunnel_01
+        portal['unix:/02'] = self.tunnel_02
+
+        portal.reap()
+        self.assertEqual(len(portal), 2)
+        for entry in portal:
+            self.assertIn(entry, (self.tunnel_01, self.tunnel_02))
+
+    @patch('subprocess.Popen')
+    @patch('os.path.exists', return_value=True)
+    @patch('weakref.finalize')
+    def test_tunnel(self, mock_finalize, mock_exists, mock_Popen):
+        context = Context(
+            'unix:/01',
+            'io.projectatomic.podman',
+            '/tmp/user/socket',
+            '/run/podman/socket',
+            'user',
+            'hostname',
+            '~/.ssh/id_rsa',
+        )
+        tunnel = Tunnel(context).bore('unix:/01')
+
+        cmd = [
+            'ssh',
+            '-nNT',
+            '-L',
+            '{}:{}'.format(context.local_socket, context.remote_socket),
+            '-i',
+            context.identity_file,
+            'ssh://{}@{}'.format(context.username, context.hostname),
+        ]
+
+        mock_finalize.assert_called_once_with(tunnel, tunnel.close, 'unix:/01')
+        mock_exists.assert_called_once_with(context.local_socket)
+        mock_Popen.assert_called_once_with(cmd, close_fds=True)