_______________________ test_no_numpy_warnings[contours] _______________________

ignore_matplotlibrc = None
tmpdir = local('/tmp/pytest-of-root/pytest-0/test_no_numpy_warnings_contour0')
grid_type = 'contours'

    @pytest.mark.parametrize('grid_type', ['lines', 'contours'])
    def test_no_numpy_warnings(ignore_matplotlibrc, tmpdir, grid_type):
        ax = plt.subplot(1, 1, 1, projection=WCS(TARGET_HEADER))
        ax.imshow(np.zeros((100, 200)))
        ax.coords.grid(color='white', grid_type=grid_type)
    
        with pytest.warns(None) as warning_lines:
>           plt.savefig(tmpdir.join('test.png').strpath)

../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/astropy/visualization/wcsaxes/tests/test_misc.py:80: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/matplotlib/pyplot.py:956: in savefig
    fig.canvas.draw_idle()   # need this if 'transparent=True' to reset colors
../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/matplotlib/backend_bases.py:2058: in draw_idle
    self.draw(*args, **kwargs)
../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/matplotlib/backends/backend_agg.py:406: in draw
    self.figure.draw(self.renderer)
../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/matplotlib/artist.py:74: in draw_wrapper
    result = draw(artist, renderer, *args, **kwargs)
../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/matplotlib/artist.py:51: in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/matplotlib/figure.py:2727: in draw
    renderer, self, artists, self.suppressComposite)
../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/matplotlib/image.py:132: in _draw_list_compositing_images
    a.draw(renderer)
../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/astropy/visualization/wcsaxes/core.py:459: in draw
    super().draw(renderer, **kwargs)
../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/matplotlib/artist.py:51: in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/matplotlib/_api/deprecation.py:421: in wrapper
    return func(*inner_args, **inner_kwargs)
../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/matplotlib/axes/_base.py:3102: in draw
    mimage._draw_list_compositing_images(renderer, self, artists)
../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/matplotlib/image.py:132: in _draw_list_compositing_images
    a.draw(renderer)
../../.tox/py37-test-image-mpldev/lib/python3.7/site-packages/matplotlib/artist.py:51: in draw_wrapper
    return draw(artist, renderer, *args, **kwargs)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = <matplotlib.collections.PathCollection object at 0x7f51ca1ac128>
renderer = <matplotlib.backends.backend_agg.RendererAgg object at 0x7f51cc0a0ef0>

    @artist.allow_rasterization
    def draw(self, renderer):
>       self.set_sizes(self._sizes, self.figure.dpi)
E       AttributeError: 'NoneType' object has no attribute 'dpi'

commit d49696aba62820ce4bab41ae4a8508743e39a0e4
Author: Jody Klymak <...>
Date:   Sun Mar 14 14:08:50 2021 -0700

    New doc gallery for plot_types