hook up tornado when running launchers

fixes capture of subprocess output

Author: minrk

ipyparallel/tests/test_cluster.py

@@ -19,7 +19,7 @@
 
 
 @pytest.fixture
-def Cluster(request):
+def Cluster(request, io_loop):
     """Fixture for instantiating Clusters"""
 
     def ClusterConstructor(**kwargs):

setup.py

@@ -128,7 +128,14 @@ def run(self):
     python_requires=">=3.6",
     extras_require={
         "nbext": ["notebook"],
-        "test": ["pytest", "pytest-cov", "pytest-asyncio", "ipython[test]", "testpath"],
+        "test": [
+            "pytest",
+            "pytest-cov",
+            "pytest-asyncio",
+            "pytest-tornado",
+            "ipython[test]",
+            "testpath",
+        ],
     },
     entry_points={
         "console_scripts": [