TST: add jupyter to 3.6 test

jklymak · jklymak · commit e8ab1b06a712 · 2018-06-12T14:11:18.000-07:00
diff --git a/.travis.yml b/.travis.yml
@@ -54,6 +54,7 @@ env:
     - NOSE=
     - NUMPY=numpy
     - PANDAS=
+    - JUPYTER=
     - PYPARSING=pyparsing
     - PYTEST='pytest>=3.4'
     - PYTEST_COV=pytest-cov
@@ -94,6 +95,7 @@ matrix:
       env:
         - DELETE_FONT_CACHE=1
         - PANDAS='pandas<0.21.0'
+        - JUPYTER='jupyter'
         - PYTEST_PEP8=pytest-pep8
         - PYTEST_ADDOPTS="$PYTEST_ADDOPTS --pep8"
     - python: "nightly"
@@ -147,6 +149,7 @@ install:
         $NOSE \
         $NUMPY \
         $PANDAS \
+        $JUPYTER \
         pillow \
         $PYPARSING \
         $SPHINX \
diff --git a/lib/matplotlib/tests/test_backend_nbagg.py b/lib/matplotlib/tests/test_backend_nbagg.py
@@ -2,11 +2,13 @@
 import os
 import subprocess
 import tempfile
-import nbformat
+import pytest
 
+nbformat = pytest.importorskip('nbformat')
 
 # From https://blog.thedataincubator.com/2016/06/testing-jupyter-notebooks/
 
+
 def _notebook_run(nb_file):
     """Execute a notebook via nbconvert and collect output.
        :returns (parsed nb object, execution errors)
