Factor failing tests out of language/async_star_test.dart

Factor failing tests out of language/async_star_test.dart

Make async_star_test no longer a multitest, and stop using package:test in
the factored tests.

BUG=dartbug.com/2238, dartbug.com/22853
R=lrn@google.com

Committed: https://github.com/dart-lang/sdk/commit/60c7a3d0abb5df3e833e15b279a0c0ff0fd39083

[Bill Hesse, 2015-08-05 14:37:18]

whesse@google.com changed reviewers:
+ lrn@google.com

[Bill Hesse, 2015-08-05 14:37:19]

Here is a first stab at factoring out failing tests.  I haven't run them yet -
please take an initial look.

[Bill Hesse, 2015-08-06 09:41:59]

Ready for review - tested on vm, dart2js, and analyzer.

[Lasse Reichstein Nielsen, 2015-08-06 12:38:42]

LGTM

https://codereview.chromium.org/1270413002/diff/40001/tests/language/async_st...
File tests/language/async_star_await_pauses_test.dart (right):

https://codereview.chromium.org/1270413002/diff/40001/tests/language/async_st...
tests/language/async_star_await_pauses_test.dart:24: r += await new
Future.delayed(new Duration(milliseconds: 10), () => i);
It is probably even ok to change to Duration.ZERO.

https://codereview.chromium.org/1270413002/diff/40001/tests/language/async_st...
File tests/language/async_star_stream_take_test.dart (right):

https://codereview.chromium.org/1270413002/diff/40001/tests/language/async_st...
tests/language/async_star_stream_take_test.dart:9: mkStream(int n) async* {
I'd add "Stream" as return type.
Just because checked mode has helped me find bugs in my tests before.

[Bill Hesse, 2015-08-06 12:56:35]

Committed patchset #4 (id:60001) manually as
60c7a3d0abb5df3e833e15b279a0c0ff0fd39083 (presubmit successful).