Support hierarchical tests

Hi,

I am working a lot with images and therefore love the idea of the project. I played around with it a little bit and noticed something.

When I group my tests in classes, the image file gets named only after the function that calls it.

Example:

class Test_Imageutils:
    @pytest.mark.mpl_image_compare
    def test_put_text(self):
        from skimage import data
        astronaut = data.astronaut()
        annotated = imageutils.put_text(astronaut.copy(), "hi", loc="center")
        fig, ax = plt.subplots(1, 1, figsize=(6, 6))
        ax.imshow(annotated)
        return fig

And the image in baseline is named test_put_text.png

I think it would be a great idea to add an option to write the full hierarchy, either into folders or into the file name. For example

• baseline/Test_Imageutils/test_put_text.png
• baseline/Test_Imageutils-test_put_text.png

What do you think?

I could dig a little into the code and come up with a PR if anyone thinks it is a good idea.

Commencez par localiser le code qui dérive les noms des images de référence à partir des tests pytest, en utilisant l’exemple Test_Imageutils/test_put_text comme cas attendu. Comparez les approches par dossier et par nom de fichier décrites dans l’issue, puis définissez l’option et vérifiez que les noms hiérarchiques sont générés de manière cohérente.