Tests fail on Python 3.7

When I run the test suite on Python 3.7 I get the following errors:

=======================================================================================
$ /usr/bin/python3 setup.py nosetests
running nosetests
running egg_info
writing lazr.smtptest.egg-info/PKG-INFO
writing dependency_links to lazr.smtptest.egg-info/dependency_links.txt
writing namespace_packages to lazr.smtptest.egg-info/namespace_packages.txt
writing requirements to lazr.smtptest.egg-info/requires.txt
writing top-level names to lazr.smtptest.egg-info/top_level.txt
reading manifest file 'lazr.smtptest.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no previously-included files found matching '.bzrignore'
writing manifest file 'lazr.smtptest.egg-info/SOURCES.txt'
nose.config: INFO: Set working dir to /builddir/build/BUILD/lazr.smtptest-2.0.3
nose.config: INFO: Ignoring files matching ['^\\.', '^_', '^setup\\.py$']
nose.plugins.cover: ERROR: Coverage not available: unable to import coverage module
Doctest: README.rst ... ok
Doctest: queue.rst ... FAIL
Doctest: usage.rst ... ok
======================================================================
FAIL: Doctest: queue.rst
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib64/python3.7/doctest.py", line 2198, in runTest
    raise self.failureException(self.format_failure(new.getvalue()))
AssertionError: Failed doctest test for queue.rst
  File "/builddir/build/BUILD/lazr.smtptest-2.0.3/lazr/smtptest/docs/queue.rst", line 0
----------------------------------------------------------------------
File "/builddir/build/BUILD/lazr.smtptest-2.0.3/lazr/smtptest/docs/queue.rst", line 140, in queue.rst
Failed example:
    for message in controller:
        print(message['message-id'])
Exception raised:
    Traceback (most recent call last):
      File "/builddir/build/BUILD/lazr.smtptest-2.0.3/lazr/smtptest/controller.py", line 129, in __iter__
        yield self.queue.get_nowait()
      File "/usr/lib64/python3.7/queue.py", line 198, in get_nowait
        return self.get(block=False)
      File "/usr/lib64/python3.7/queue.py", line 167, in get
        raise Empty
    _queue.Empty
    During handling of the above exception, another exception occurred:
    Traceback (most recent call last):
      File "/builddir/build/BUILD/lazr.smtptest-2.0.3/lazr/smtptest/controller.py", line 131, in __iter__
        raise StopIteration
    StopIteration
    The above exception was the direct cause of the following exception:
    Traceback (most recent call last):
      File "/usr/lib64/python3.7/doctest.py", line 1329, in __run
        compileflags, 1), test.globs)
      File "<doctest queue.rst[25]>", line 1, in <module>
        for message in controller:
    RuntimeError: generator raised StopIteration
----------------------------------------------------------------------
File "/builddir/build/BUILD/lazr.smtptest-2.0.3/lazr/smtptest/docs/queue.rst", line 158, in queue.rst
Failed example:
    for message in controller:
        print(message['message-id'])
Exception raised:
    Traceback (most recent call last):
      File "/builddir/build/BUILD/lazr.smtptest-2.0.3/lazr/smtptest/controller.py", line 129, in __iter__
        yield self.queue.get_nowait()
      File "/usr/lib64/python3.7/queue.py", line 198, in get_nowait
        return self.get(block=False)
      File "/usr/lib64/python3.7/queue.py", line 167, in get
        raise Empty
    _queue.Empty
    During handling of the above exception, another exception occurred:
    Traceback (most recent call last):
      File "/builddir/build/BUILD/lazr.smtptest-2.0.3/lazr/smtptest/controller.py", line 131, in __iter__
        raise StopIteration
    StopIteration
    The above exception was the direct cause of the following exception:
    Traceback (most recent call last):
      File "/usr/lib64/python3.7/doctest.py", line 1329, in __run
        compileflags, 1), test.globs)
      File "<doctest queue.rst[27]>", line 1, in <module>
        for message in controller:
    RuntimeError: generator raised StopIteration
-------------------- >> begin captured logging << --------------------
lazr.smtptest: INFO: [SMTPServer] listening: localhost:9025
lazr.smtptest: INFO: starting the SMTP server thread
lazr.smtptest: INFO: [SMTPServer] starting asyncore loop
lazr.smtptest: INFO: connecting to localhost:9025
lazr.smtptest: INFO: [SMTPServer] accepted: ('::1', 44848, 0, 0)
lazr.smtptest: INFO: Got HELO response: (250, b'buildvm-aarch64-12.arm.fedoraproject.org')
lazr.smtptest: INFO: [SMTPServer] accepted: ('::1', 44850, 0, 0)
lazr.smtptest: INFO: [SMTPServer] processing: ('::1', 44850, 0, 0), <email address hidden>, ['<email address hidden>'], size=133
lazr.smtptest: INFO: [SMTPServer] processed message: <elephant>
lazr.smtptest: INFO: [SMTPServer] processing: ('::1', 44850, 0, 0), <email address hidden>, ['<email address hidden>'], size=131
lazr.smtptest: INFO: [SMTPServer] processed message: <falcon>
lazr.smtptest: INFO: [SMTPServer] processing: ('::1', 44850, 0, 0), <email address hidden>, ['<email address hidden>'], size=129
lazr.smtptest: INFO: [SMTPServer] processed message: <goat>
lazr.smtptest: INFO: stopping the SMTP server thread
lazr.smtptest: INFO: [SMTPServer] accepted: ('::1', 44852, 0, 0)
lazr.smtptest: INFO: SMTP server stopped
lazr.smtptest: INFO: [SMTPServer] listening: localhost:9025
lazr.smtptest: INFO: starting the SMTP server thread
lazr.smtptest: INFO: [SMTPServer] starting asyncore loop
lazr.smtptest: INFO: connecting to localhost:9025
lazr.smtptest: INFO: [SMTPServer] accepted: ('::1', 44854, 0, 0)
lazr.smtptest: INFO: Got HELO response: (250, b'buildvm-aarch64-12.arm.fedoraproject.org')
lazr.smtptest: INFO: [SMTPServer] accepted: ('::1', 44856, 0, 0)
lazr.smtptest: INFO: [SMTPServer] processing: ('::1', 44856, 0, 0), <email address hidden>, ['<email address hidden>'], size=130
lazr.smtptest: INFO: [SMTPServer] processed message: <horse>
lazr.smtptest: INFO: [SMTPServer] processing: ('::1', 44856, 0, 0), <email address hidden>, ['<email address hidden>'], size=131
lazr.smtptest: INFO: [SMTPServer] processed message: <iguana>
lazr.smtptest: INFO: [SMTPServer] processing: ('::1', 44856, 0, 0), <email address hidden>, ['<email address hidden>'], size=131
lazr.smtptest: INFO: [SMTPServer] processed message: <jackel>
lazr.smtptest: INFO: [SMTPServer] processing: ('::1', 44856, 0, 0), <email address hidden>, ['<email address hidden>'], size=133
lazr.smtptest: INFO: [SMTPServer] processed message: <kangaroo>
lazr.smtptest: INFO: [SMTPServer] processing: ('::1', 44856, 0, 0), <email address hidden>, ['<email address hidden>'], size=130
lazr.smtptest: INFO: [SMTPServer] processed message: <llama>
lazr.smtptest: INFO: [SMTPServer] processing: ('::1', 44856, 0, 0), <email address hidden>, ['<email address hidden>'], size=131
lazr.smtptest: INFO: [SMTPServer] processed message: <moose>
lazr.smtptest: INFO: resetting the SMTP server.
lazr.smtptest: INFO: [SMTPServer] accepted: ('::1', 44858, 0, 0)
lazr.smtptest: INFO: stopping the SMTP server thread
lazr.smtptest: INFO: [SMTPServer] accepted: ('::1', 44860, 0, 0)
lazr.smtptest: INFO: SMTP server stopped
--------------------- >> end captured logging << ---------------------
----------------------------------------------------------------------
Ran 3 tests in 0.615s
FAILED (failures=1)
=======================================================================================

Is Python 3.7 supported at all? The homepage says that it is recommended to use aiosmtpd on Python3 instead of this package.