Add test for code inspection in MockMetaData with ipython

[tkilias]

The code inspection in MockMetaData can make problems under Jupyter, for that reason, we need to test it with ipython.

You can run code under ipython as follows:

import IPython
from traitlets.config import Config
import multiprocessing


def run_ipython_first():
    c = Config()
    c.InteractiveShellApp.code_to_run = """
        print('exit1')
        exit()
    """
    c.InteractiveShell.confirm_exit = False
    IPython.start_ipython(config=c)
    print("after1")


def run_ipython_second():
    c = Config()
    c.InteractiveShellApp.code_to_run = """
        print('assert2')
        assert 1==0
    """
    c.InteractiveShell.confirm_exit = False
    IPython.start_ipython(config=c)
    print("after2")  # This will never print because the IPython instance will raise an AssertionError


if __name__ == "__main__":
    p1 = multiprocessing.Process(target=run_ipython_first)
    p2 = multiprocessing.Process(target=run_ipython_second)

    p1.start()
    p1.join()  # Wait for the first process to finish

    p2.start()
    p2.join()  # Wait for the second process to finish