fe01ec1d12
Some changes were required to stream_transformer_test to make it strong mode clean. Other minor changes involved migrating from unittest->test. Bug: Change-Id: Ia21144090710137e4803c651cf9e3fd62e17f5f7 Reviewed-on: https://dart-review.googlesource.com/3707 Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>