* Run flutter tests in preview-dart-2 mode on travis flutter builds.
* Run dart2 tests on osx. Run dart tests in dart2.
* Fix name camelCase
* Default options to empty array, rather than null
* Troubleshoot failures
* More logging
* Troubleshoot: run single test
* Troubleshoot: run 15 tests
* Troubleshoot: run 15 tests with fix
* Try limit concurrency to 1
* Limit concurrency for preview-dart-2 tests to 4
* Move dart2 tests to allow_failures section
* Reinstate tests_dart_2 shard
* Raise concurrency to 8
* Reuse compiler across multiple test runs
* Allow to switch entry points when recompiling.
Actually use single compiler to incrementally recompile all tests executed by 'flutter test'.
* Remove leftover commented code
* Fix comment
* Lints
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