* Reland 9534082fc097dadf075c1eda7938af48df59ce3e with fix for incremental compilation.
When in incremental mode, awaiting exitCode won't work because compiler is not expected to exit after compilation.
Instead listen for stdout stream closing and report error if outputFilename has not been received.
* Fix lints
* Change async stubbing to use thenAnswer.
Mockito now prohibits calling thenReturn with Futures and Streams. dart-lang/mockito#79
* Update all Mockito deps to 3.0.0.
* Revert "Update all Mockito deps to 3.0.0."
This reverts commit e8ab9d37c33d3d7fe384abde64ea5b4d72623c75.
I did not correctly update the mockito dep, and there's no easy way to update to 3.0 alpha right now.
* Change thenAnswer((_) => to thenAnswer((invocation) =>
* Add Invocation type to thenAnswer lambdas
