Added unit tests for packets.

Also did some code cleanup.

tests/cmds/test_send_message.py

@@ -12,7 +12,7 @@ from aprsd.main import cli
 from .. import fake
 
 CONF = cfg.CONF
-F = t.TypeVar("F", bound=t.Callable[..., t.Any])
+F = t.TypeVar('F', bound=t.Callable[..., t.Any])
 
 
 class TestSendMessageCommand(unittest.TestCase):
@@ -28,37 +28,37 @@ class TestSendMessageCommand(unittest.TestCase):
         # CONF.aprsd_admin_extension.user = "admin"
         # CONF.aprsd_admin_extension.password = "password"
 
-    @mock.patch("aprsd.log.log.setup_logging")
+    @mock.patch('aprsd.log.log.setup_logging')
     def test_no_tocallsign(self, mock_logging):
         """Make sure we get an error if there is no tocallsign."""
 
         self.config_and_init(
-            login="something",
-            password="another",
+            login='something',
+            password='another',
         )
         runner = CliRunner()
 
         result = runner.invoke(
             cli,
-            ["send-message"],
+            ['send-message'],
             catch_exceptions=False,
         )
         assert result.exit_code == 2
         assert "Error: Missing argument 'TOCALLSIGN'" in result.output
 
-    @mock.patch("aprsd.log.log.setup_logging")
+    @mock.patch('aprsd.log.log.setup_logging')
     def test_no_command(self, mock_logging):
         """Make sure we get an error if there is no command."""
 
         self.config_and_init(
-            login="something",
-            password="another",
+            login='something',
+            password='another',
         )
         runner = CliRunner()
 
         result = runner.invoke(
             cli,
-            ["send-message", "WB4BOR"],
+            ['send-message', 'WB4BOR'],
             catch_exceptions=False,
         )
         assert result.exit_code == 2