Iincrease shown test coverage (#692)
Iincrease shown test coverage (#692)

* Do all rolling tests with single processing and better add another test for multi processing

* Add additional test cases

* pep8ify

Co-authored-by: Nils Braun <b40e97f2c907f1fd2c73af26e7abe0ef8f64ec53@gmail.com>
blue-yonder/tsfresh,blue-yonder/tsfresh