Attempt using ipykernel prerelease

Author: SylvainCorlay

.github/workflows/main.yml

@@ -53,7 +53,7 @@ jobs:
       - name: Install dependencies
         run: |
           pip install --upgrade setuptools pip
-          pip install --upgrade --upgrade-strategy eager -e .[test] pytest-cov codecov 'coverage<5'
+          pip install --upgrade --upgrade-strategy eager --pre -e .[test] pytest-cov codecov 'coverage<5'
           pip freeze
       - name: Check types
         run: mypy jupyter_client/manager.py jupyter_client/multikernelmanager.py jupyter_client/client.py jupyter_client/blocking/client.py jupyter_client/asynchronous/client.py jupyter_client/channels.py jupyter_client/session.py jupyter_client/adapter.py jupyter_client/connect.py jupyter_client/consoleapp.py jupyter_client/jsonutil.py jupyter_client/kernelapp.py jupyter_client/launcher.py

jupyter_client/tests/test_client.py

@@ -81,7 +81,10 @@ def test_comm_info(self):
 
     def test_shutdown(self):
         kc = self.kc
-        msg_id = kc.shutdown()
-        self.assertIsInstance(msg_id, str)
         reply = kc.shutdown(reply=True, timeout=TIMEOUT)
         self._check_reply("shutdown", reply)
+
+    def test_shutdown_id(self):
+        kc = self.kc
+        msg_id = kc.shutdown()
+        self.assertIsInstance(msg_id, str)