unit tests: use RandomState and decrease number of samples in generated arrays to speed up tests
unit tests: use RandomState and decrease number of samples in generated arrays to speed up tests

ibab/root_numpy,ibab/root_numpy,ndawe/root_numpy,ibab/root_numpy,ndawe/root_numpy,ndawe/root_numpy,scikit-hep/root_numpy,scikit-hep/root_numpy,rootpy/root_numpy,ibab/root_numpy,scikit-hep/root_numpy,ndawe/root_numpy,rootpy/root_numpy,rootpy/root_numpy,rootpy/root_numpy,scikit-hep/root_numpy