sphinx_gallery optional for testing

sphinx_gallery requires matplotlib, which at the current time fails to install on pypy

.travis.yml

@@ -20,6 +20,8 @@ install:
   # install black if available (Python 3.6 and above), and autopep8 for testing the pipe mode
   - pip install black || true
   - pip install autopep8 || true
+  # install sphinx_gallery and matplotlib if available (may not work on pypy)
+  - pip install sphinx_gallery || true
 before_script:
   # stop the build if there are Python syntax errors or undefined names
   - flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics

requirements-dev.txt

@@ -3,5 +3,3 @@ pytest
 pytest-cov==2.5.1
 codecov
 notebook
-sphinx_gallery
-recommonmark

tests/test_cli.py

@@ -15,7 +15,7 @@
 from jupytext.compare import compare_notebooks
 from jupytext.paired_paths import paired_paths
 from jupytext.formats import long_form_one_format, JupytextFormatError
-from .utils import list_notebooks, requires_black, requires_flake8, skip_if_dict_is_not_ordered
+from .utils import list_notebooks, requires_black, requires_flake8, requires_sphinx_gallery, skip_if_dict_is_not_ordered
 
 
 def test_str2bool():
@@ -739,6 +739,7 @@ def test_cli_sync_file_with_suffix(tmpdir):
     assert open(tmp_rmd).read().splitlines()[-4:] == ['', '```{python}', '1+1', '```']
 
 
+@requires_sphinx_gallery
 def test_rst2md(tmpdir):
     tmp_py = str(tmpdir.join('notebook.py'))
     tmp_ipynb = str(tmpdir.join('notebook.ipynb'))

tests/test_contentsmanager.py

@@ -14,8 +14,7 @@
 from jupytext.header import header_to_metadata_and_cell
 from jupytext.formats import read_format_from_metadata, auto_ext_from_metadata
 from jupytext.contentsmanager import kernelspec_from_language
-from .utils import list_notebooks
-from .utils import skip_if_dict_is_not_ordered
+from .utils import list_notebooks, requires_sphinx_gallery, skip_if_dict_is_not_ordered
 
 
 def test_create_contentsmanager():
@@ -960,6 +959,7 @@ def test_pair_notebook_in_dotdot_folder(tmpdir):
     cm.get('scripts/notebook_name.py')
 
 
+@requires_sphinx_gallery
 def test_rst2md_option(tmpdir):
     tmp_py = str(tmpdir.join('notebook.py'))
 

tests/utils.py

@@ -3,6 +3,7 @@
 import re
 import pytest
 from jupytext.cli import system
+from jupytext.cell_reader import rst2md
 
 skip_if_dict_is_not_ordered = pytest.mark.skipif(
     sys.version_info < (3, 6),
@@ -19,6 +20,7 @@ def tool_version(tool):
 requires_black = pytest.mark.skipif(not tool_version('black'), reason='black not found')
 requires_flake8 = pytest.mark.skipif(not tool_version('flake8'), reason='flake8 not found')
 requires_autopep8 = pytest.mark.skipif(not tool_version('autopep8'), reason='autopep8 not found')
+requires_sphinx_gallery = pytest.mark.skipif(not rst2md, reason='sphinx_gallery not available')
 
 
 def list_notebooks(path='ipynb', skip='World'):