use dummy data for generator tests

[florian-huber]

@niekdejonge this is intended to expand tests on our generators where needed.

In addition the the former tests which use an actual data file it now runs a test using dummy data of the form:

• fake inchikey "AAAAA..." to "JJJJ....."
• fake tanimoto scores --> simple the distance in the alphabet, scaled to 0 - 1.0
• one peak per spectrum, different position for each inchikey

I hope that this way we can better check if the score bins are used properly. And maybe also test if the data is selected the way we intended.

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[florian-huber]

Thanks @niekdejonge . I added your suggestions.