Avoid using module globals in doctest

[ydshieh]

When running doctest, a (copy of) the module’s globals will be used, so even without importing a package inside a docstring, the test will pass (if it is imported at the top level of the module). See the example at the end.

However, it implies that when a user copy-paste a docstring to run the example, it could fail due to missing imports, even if the doctest passes in the CI.

In doctest module, there is a notion called execution context, and we can pass globs=your_dict to testmod() in order to change it.

However, I could not find a way to use such mechanism when launching doctest through pytest.

Question: Is it possible to use custom globals when running pytest --doctest-module?

Example

pytest --doctest-modules dummy_test.py -sv --doctest-continue-on-failure

dummy_test.py

import numpy as np

def foo():
    r"""
    Returns:

    Examples:

    ```python
    >>> c = np.arange(10)

    ```"""