Add a more direct test of multi-gpu training working (#2084)
Add a more direct test of multi-gpu training working (#2084)

* Add a more direct test of multi-gpu training working

* Update tests/base/develop_pipelines.py

Co-authored-by: Adrian Wälchli <5b4e4cffa129a3d56e8f9fb9c37adfa57835aadb@gmail.com>
williamFalcon/pytorch-lightning,williamFalcon/pytorch-lightning