Implement test_bobura::command::horizontally_zoom_in #88
Implement test_bobura::command::horizontally_zoom_out #88
Implement test_bobura::command::vertically_zoom_in #88
Implement test_bobura::command::vertically_zoom_out #88
Implement test_bobura::command::set_horizontal_scale #88
Implement test_bobura::command::set_vertical_scale #88