Added hasProperty matcher.

Added hasProperty matcher.
See issue https://code.google.com/p/dart/issues/detail?id=11397

R=sigmund@google.com

Committed: https://code.google.com/p/dart/source/detail?r=25667

[Siggi Cherem (dart-lang), 2013-07-31 00:23:30]

given that matches are so popularly used, I'm afraid of including dart:mirrors
by default. 

Can we use the @MirrorsUsed annotation to minimize the impact of adding this
dependency?

https://codereview.chromium.org/21085010/diff/1/pkg/unittest/lib/src/core_mat...
File pkg/unittest/lib/src/core_matchers.dart (right):

https://codereview.chromium.org/21085010/diff/1/pkg/unittest/lib/src/core_mat...
pkg/unittest/lib/src/core_matchers.dart:933: description.add('has property
$_name');
might be good to quote the name "$_name"

https://codereview.chromium.org/21085010/diff/1/pkg/unittest/lib/src/core_mat...
pkg/unittest/lib/src/core_matchers.dart:946: mismatchDescription.add('has
property $_name with value ').
same here, so it reads:
has property "length" with value ___

[gram, 2013-07-31 01:13:45]

PTAL

[Siggi Cherem (dart-lang), 2013-07-31 01:45:01]

lgtm!

[gram, 2013-07-31 16:03:32]

Committed patchset #3 manually as r25667 (presubmit successful).