Added NotifyPlugin unit tests and more

This patch restructures the unit tests for plugins.
This also adds unit tests for the NotifyPlugin

tests/plugins/test_query.py

@@ -0,0 +1,37 @@
+from unittest import mock
+
+from aprsd import messaging
+from aprsd.plugins import query as query_plugin
+
+from .. import fake, test_plugin
+
+
+class TestQueryPlugin(test_plugin.TestPlugin):
+    @mock.patch("aprsd.messaging.MsgTrack.flush")
+    def test_query_flush(self, mock_flush):
+        packet = fake.fake_packet(message="!delete")
+        query = query_plugin.QueryPlugin(self.config)
+
+        expected = "Deleted ALL pending msgs."
+        actual = query.filter(packet)
+        mock_flush.assert_called_once()
+        self.assertEqual(expected, actual)
+
+    @mock.patch("aprsd.messaging.MsgTrack.restart_delayed")
+    def test_query_restart_delayed(self, mock_restart):
+        track = messaging.MsgTrack()
+        track.data = {}
+        packet = fake.fake_packet(message="!4")
+        query = query_plugin.QueryPlugin(self.config)
+
+        expected = "No pending msgs to resend"
+        actual = query.filter(packet)
+        mock_restart.assert_not_called()
+        self.assertEqual(expected, actual)
+        mock_restart.reset_mock()
+
+        # add a message
+        msg = messaging.TextMessage(self.fromcall, "testing", self.ack)
+        track.add(msg)
+        actual = query.filter(packet)
+        mock_restart.assert_called_once()