create unit tests

[bjuergens]

this guide suggests to use doctest.

Until now the testing is done manually via notebooks.

There should be some tests, that call the notebook from the commandline. This should be possible without modifying the module

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Maybe there should also be some unit tests, that use the package as regular python-module, and not as ipython. This might require some changes. But at first glance, beside the registration with ipython, only 2 parts of the package require ipython:

• shell for execution. This could be replaced by eval for non-ipython execution
• display(HTML(...)) for tables. This could be replaced by "print" for non-ipython execution

The implementation would be like this: Those 2 things get moved function-parameters in the constructor, so the caller (e.g. the magics-class) has to supply them.

The real question is: Should it even be possible to use this module outside ipython?

[bjuergens]

http://jupyter.readthedocs.io/en/latest/development_guide/testing.html

http://nbconvert.readthedocs.io/en/latest/execute_api.html#executing-notebooks-from-the-command-line