Blame tests_requirements.txt

Pierre-Yves Chibon 1d397e
mock==1.1.2
Pierre-Yves Chibon fd7141
nose
Pierre-Yves Chibon fd7141
nosexcover
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Pierre-Yves Chibon 4244fd
# Seems that mock doesn't list this one
Pierre-Yves Chibon 4244fd
funcsigs