Commits on Oct 13, 2018

1. [tests] Run tests in parallel on non-Windows …

   What do we want?  Faster unit test execution!
   
   How do we do that?  By running things in parallel!
   
   Some of our existing tests are already run in parallel, such as the
   `src/Xamarin.Android.Build.Tasks/Tests` tests which use NUnit's
   `[Parallelizable (ParallelScope.Children)]`, but there is currently no
   way to run the `Xamarin.Android.Build.Tasks` NUnit tests
   *concurrently* with the on-device `.apk` tests concurrently with the
   Java.Interop unit tests concurrently with...
   
   We *think* there might be a "win" here, as the
   `Xamarin.Android.Build.Tasks` unit tests are heavily I/O bound, while
   the `.apk` BCL tests are -- presumably -- CPU bound, so executing
   these at the same time might net some nice time savings.
   
   Spike the idea by updating the `RunAllTests` target to *generate a
   shell script* which executes `msbuild` to run the appropriate test
   target, in the background, then waiting for all jobs to finish.
   
   The generated `bin/Test$(Configuration)/parallel-targets.sh` file
   resembles:
   
   	echo Executing in background: msbuild …/build-tools/scripts/RunTests.targets /v:normal /binaryLogger:"…/msbuild-20181012T083249-Target-RunNUnitTests.binlog" /t:RunNUnitTests
   	msbuild …/build-tools/scripts/RunTests.targets /v:normal /binaryLogger:"…/msbuild-20181012T083249-Target-RunNUnitTests.binlog" /t:RunNUnitTests &
   	wait
   	exit 0

   

   jonpryor committed Oct 13, 2018
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