remove trio from test requirement and skipp if not there

IPython/core/tests/test_async_helpers.py

@@ -9,6 +9,7 b' from itertools import chain, repeat'
 import nose.tools as nt
 from textwrap import dedent, indent
 from unittest import TestCase
+from IPython.testing.decorators import skip_without
 
 ip = get_ipython()
 iprc = lambda x: ip.run_cell(dedent(x)).raise_error()
@@ -242,9 +243,11 b' if sys.version_info > (3, 5):'
             """
             )
 
+        @skip_without('curio')
         def test_autoawait_curio(self):
             iprc("%autoawait curio")
 
+        @skip_without('trio')
         def test_autoawait_trio(self):
             iprc("%autoawait trio")
 

setup.py

@@ -175,7 +175,7 b' extras_require = dict('
     parallel = ['ipyparallel'],
     qtconsole = ['qtconsole'],
     doc = ['Sphinx>=1.3'],
-    test = ['nose>=0.10.1', 'requests', 'testpath', 'pygments', 'nbformat', 'ipykernel', 'numpy', 'trio'],
+    test = ['nose>=0.10.1', 'requests', 'testpath', 'pygments', 'nbformat', 'ipykernel', 'numpy'],
     terminal = [],
     kernel = ['ipykernel'],
     nbformat = ['nbformat'],