pkg/unittest: Run each test in a Zone

pkg/unittest/CHANGELOG.md

Index: pkg/unittest/CHANGELOG.md
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+# Changelog - unittest
+
+##0.10.0-dev
+
+* Each test is run in a seperate `Zone`. This ensures that any exceptions that
+occur is async operations are reported back to the source test case.
+* **DEPRECATED** `guardAsync`, `protectAsync0`, `protectAsync1`,
+and `protectAsync2`
+    * Running each test in a `Zone` addresses the need for these methods.
+* `TestCase`:
+    * Removed properties: `setUp`, `tearDown`, `testFunction`
+    * `enabled` is now get-only
+    * Removed methods: `pass`, `fail`, `error`
+* `interactive_html_config.dart` has been removed.
+* `runTests`, `tearDown`, `setUp`, `test`, `group`, `solo_test`, and
+  `solo_group` now throw a `StateError` if called while tests are running.
+* `rerunTests` has been removed.
+
+##0.9.3 - 2014-01-13