Support for in-kernel patching?

[cpascual]

In some of my notebooks, a given function call takes long time to return, making tests unpractical.
That is why I would like to be able to patch that function in the kernel with a mock.

I tried using the hooks provided by nbclient: on_notebook_start, etc. but they are not run in the kernel and therefore I cannot patch stuff there.

Is there some way of running code in the kernel prior to executing a notebook?

Alternatively: I see that testbook supports in-kernel patching. Since both testbook's TestbookNotebookClient and pytest_notebook's CoverageNotebookClient inherit from nbclient's NotebookClient, do you think that pytest-notebook could "borrow" the implementation from TestbookNotebookClient?

[amotl]

Hi. We also used testbook the other day, for the same reasons to run a few lines of in-kernel patching.

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