DOC: add a doctest step to CI to allow writing testable code blocs, fix existing docstring code examples errors #592
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Description
Adding a doctest step in the testing process (in MAKEFILE, and in ReadTheDocs CI).
It allows to write testable code blocs using
.. testcode::
instead of.. code:: python
in our .rst files.This step also catched several existing docstring code examples errors (that should have been catched by
make tests
, but haven't, for some reason). I fixed those docstrings as well.