Added a test to show the incompatibility and fixed the code to make i…

…t pass

aioimaplib/aioimaplib.py

@@ -156,15 +156,16 @@ def __init__(self, name: str, tag: str, *args, prefix: str = None, untagged_resp
         self._timer = asyncio.Handle(lambda: None, None, self._loop)  # fake timer
         self._set_timer()
         self._expected_size = 0
-        
+
         self._resp_literal_data = bytearray()
         self._resp_result = 'Init'
         self._resp_lines: List[bytes] = list()
 
     def __repr__(self) -> str:
         return '{tag} {prefix}{name}{space}{args}'.format(
             tag=self.tag, prefix=self.prefix or '', name=self.name,
-            space=' ' if self.args else '', args=' '.join(self.args))
+            space=' ' if self.args else '', args=' '.join(str(arg) if arg is not None else '' \
+                                                          for arg in self.args))
 
     # for tests
     def __eq__(self, other):
@@ -473,7 +474,7 @@ async def xoauth2(self, user: str, token: str) -> Response:
         """Authentication with XOAUTH2.
 
         Tested with outlook.
-        
+
         Specification:
         https://learn.microsoft.com/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth
         https://developers.google.com/gmail/imap/xoauth2-protocol
@@ -787,7 +788,7 @@ async def idle_start(self, timeout: float = TWENTY_NINE_MINUTES) -> Future:
         if not self.has_pending_idle():
             wait_for_ack.cancel()
             raise Abort('server returned error to IDLE command')
-        
+
         def start_stop_wait_server_push():
             task = asyncio.ensure_future(self.stop_wait_server_push())
             self.tasks.add(task)

aioimaplib/tests/test_aioimaplib.py

@@ -471,6 +471,18 @@ async def test_search_two_messages(self):
         assert 'OK' == result
         assert b'1 2' == data[0]
 
+    async def test_search_messages(self):
+        """Increase compatibility with https://docs.python.org/3/library/imaplib.html#imap4-example."""
+        self.imapserver.receive(Mail.create(['user']))
+        self.imapserver.receive(Mail.create(['user']))
+        imap_client = await self.login_user('user', 'pass', select=True)
+
+        # E.g. typ, data = M.search(None, 'ALL')
+        result, data = await imap_client.search(None, 'ALL')
+
+        assert 'OK' == result
+        assert b'1 2' == data[0]
+
     async def test_uid_with_illegal_command(self):
         imap_client = await self.login_user('user', 'pass', select=True)