Fix broken unit tests and typing

pymap/mime/parsed.py

@@ -55,8 +55,11 @@ def _parse(cls, values: Sequence[Sequence[bytes]]) \
         for value in values:
             lines = [line.decode('ascii', 'surrogateescape')
                      for line in value]
-            hdr_name, hdr_val = SMTP.header_source_parse(lines)
-            yield cls._registry(hdr_name, hdr_val)
+            # TODO: Once typeshed merges this fix:
+            #   https://github.com/python/typeshed/pull/4365
+            # assign to hdr_name, hdr_value = ... instead.
+            hdr_tuple = SMTP.header_source_parse(lines)
+            yield cls._registry(hdr_tuple[0], hdr_tuple[1])
 
     def __repr__(self) -> str:
         return repr(dict(self))

setup.py

@@ -56,7 +56,8 @@
           'redis': ['aioredis >= 1.3.0', 'msgpack >= 1.0'],
           'admin': ['pymap-admin == 0.4.2'],
           'sieve': ['sievelib'],
-          'optional': ['hiredis', 'passlib', 'systemd-python', 'pid']},
+          'systemd': ['systemd-python'],
+          'optional': ['hiredis', 'passlib', 'pid']},
       entry_points={
           'console_scripts': [
               'pymap = pymap.main:main'],

test/server/mocktransport.py

@@ -20,6 +20,7 @@ class _Socket:
 
     def __init__(self, fd: int) -> None:
         self.fd = fd
+        self.family = None
 
     def fileno(self):
         return self.fd