Added some plugin unit tests

This patch adds some real unit tests for the following plugins
PingPlugin
TimePlugin
VersionPlugin

tests/test_plugin.py

@@ -0,0 +1,95 @@
+# -*- coding: utf-8 -*-
+import sys
+import unittest
+from unittest import mock
+
+import pytest
+
+import aprsd
+from aprsd import plugin
+from aprsd.fuzzyclock import fuzzy
+
+
+class testPlugin(unittest.TestCase):
+    def setUp(self):
+        self.config = mock.MagicMock()
+
+    @mock.patch("time.localtime")
+    def test_Time(self, mock_time):
+        fake_time = mock.MagicMock()
+        h = fake_time.tm_hour = 16
+        m = fake_time.tm_min = 12
+        s = fake_time.tm_sec = 55
+        mock_time.return_value = fake_time
+        time_plugin = plugin.TimePlugin(self.config)
+
+        fromcall = "KFART"
+        message = "location"
+        ack = 1
+
+        actual = time_plugin.run(fromcall, message, ack)
+        self.assertEqual(None, actual)
+
+        cur_time = fuzzy(h, m, 1)
+
+        message = "time"
+        expected = "{} ({}:{} PDT) ({})".format(
+            cur_time, str(h), str(m).rjust(2, "0"), message.rstrip()
+        )
+        actual = time_plugin.run(fromcall, message, ack)
+        self.assertEqual(expected, actual)
+
+    @mock.patch("time.localtime")
+    def test_Ping(self, mock_time):
+        fake_time = mock.MagicMock()
+        h = fake_time.tm_hour = 16
+        m = fake_time.tm_min = 12
+        s = fake_time.tm_sec = 55
+        mock_time.return_value = fake_time
+
+        ping = plugin.PingPlugin(self.config)
+
+        fromcall = "KFART"
+        message = "location"
+        ack = 1
+
+        result = ping.run(fromcall, message, ack)
+        self.assertEqual(None, result)
+
+        def ping_str(h, m, s):
+            return (
+                "Pong! "
+                + str(h).zfill(2)
+                + ":"
+                + str(m).zfill(2)
+                + ":"
+                + str(s).zfill(2)
+            )
+
+        message = "Ping"
+        actual = ping.run(fromcall, message, ack)
+        expected = ping_str(h, m, s)
+        self.assertEqual(expected, actual)
+
+        message = "ping"
+        actual = ping.run(fromcall, message, ack)
+        self.assertEqual(expected, actual)
+
+    def test_version(self):
+        expected = "APRSD version '{}'".format(aprsd.__version__)
+        version_plugin = plugin.VersionPlugin(self.config)
+
+        fromcall = "KFART"
+        message = "No"
+        ack = 1
+
+        actual = version_plugin.run(fromcall, message, ack)
+        self.assertEqual(None, actual)
+
+        message = "version"
+        actual = version_plugin.run(fromcall, message, ack)
+        self.assertEqual(expected, actual)
+
+        message = "Version"
+        actual = version_plugin.run(fromcall, message, ack)
+        self.assertEqual(expected, actual)