test(client): test early disconnect

The test does not fails but outputs the following erroneous logs:

  ERROR    root:message_bus.py:1194 add match request failed. match="sender='org.freedesktop.DBus',interface='org.freedesktop.DBus',path='/org/freedesktop/DBus',member='NameOwnerChanged'",
  WARNING  root:message_bus.py:584 a message handler threw an exception on shutdown
  Traceback (most recent call last):
    File "/home/mocramis/misc/dbus-fast/src/dbus_fast/aio/message_reader.py", line 22, in _message_reader
      message = unmarshaller._unmarshall()
    File "/home/mocramis/misc/dbus-fast/src/dbus_fast/_private/unmarshaller.py", line 742, in _unmarshall
      self._read_header()
    File "/home/mocramis/misc/dbus-fast/src/dbus_fast/_private/unmarshaller.py", line 611, in _read_header
      self._read_to_pos(HEADER_SIGNATURE_SIZE)
    File "/home/mocramis/misc/dbus-fast/src/dbus_fast/_private/unmarshaller.py", line 366, in _read_to_pos
      self._read_sock_without_fds(pos)
    File "/home/mocramis/misc/dbus-fast/src/dbus_fast/_private/unmarshaller.py", line 329, in _read_sock_without_fds
      raise EOFError()
  EOFError

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "/home/mocramis/misc/dbus-fast/src/dbus_fast/message_bus.py", line 582, in _finalize
      handler(None, err)
    File "/home/mocramis/misc/dbus-fast/src/dbus_fast/message_bus.py", line 737, in _reply_notify
      callback(reply, err)
    File "/home/mocramis/misc/dbus-fast/src/dbus_fast/message_bus.py", line 1197, in add_match_notify
      if msg.message_type == MessageType.ERROR:
  AttributeError: 'NoneType' object has no attribute 'message_type'

However, trying to capture those logs seems to prevent the race
condition from happening. Therefore, we just run the test for coverage.

tests/client/test_aio.py

@@ -0,0 +1,23 @@
+import pytest
+
+from dbus_fast import aio
+from dbus_fast.service import ServiceInterface
+
+
+class ExampleInterface(ServiceInterface):
+    def __init__(self):
+        super().__init__("test.interface")
+
+
+@pytest.mark.asyncio
+async def test_fast_disconnect():
+    bus_name = "aio.client.test.methods"
+
+    bus = await aio.MessageBus().connect()
+    bus2 = await aio.MessageBus().connect()
+    await bus.request_name(bus_name)
+    service_interface = ExampleInterface()
+    bus.export("/test/path", service_interface)
+    introspection = await bus2.introspect(bus_name, "/test/path")
+    bus2.get_proxy_object(bus_name, "/test/path", introspection)
+    bus2.disconnect()