Properly close `setUpAll` and `tearDownAll` tests.

Closes #349

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1407593002 .
diff --git a/lib/src/runner/engine.dart b/lib/src/runner/engine.dart
index ed88544..8862ee3 100644
--- a/lib/src/runner/engine.dart
+++ b/lib/src/runner/engine.dart
@@ -132,6 +132,12 @@
   List<LiveTest> get active => new UnmodifiableListView(_active);
   final _active = new QueueList<LiveTest>();
 
+  /// The set of tests that have completed successfully but shouldn't be
+  /// displayed by the reporter.
+  ///
+  /// This includes load tests, `setUpAll`, and `tearDownAll`.
+  final _hidden = new Set<LiveTest>();
+
   /// The tests from [LoadSuite]s that are still running, in the order they
   /// began running.
   ///
@@ -294,6 +300,7 @@
         _passed.add(liveTest);
       } else {
         _liveTests.remove(liveTest);
+        _hidden.add(liveTest);
       }
     });
 
@@ -339,9 +346,12 @@
       }
 
       // Surface the load test if it fails so that the user can see the failure.
-      if (state.result == Result.success) return;
-      _failed.add(liveTest);
-      _liveTests.add(liveTest);
+      if (state.result == Result.success) {
+        _hidden.add(liveTest);
+      } else {
+        _failed.add(liveTest);
+        _liveTests.add(liveTest);
+      }
     });
 
     // Run the test immediately. We don't want loading to be blocked on suites
@@ -369,7 +379,9 @@
 
     // Close the running tests first so that we're sure to wait for them to
     // finish before we close their suites and cause them to become unloaded.
-    var allLiveTests = liveTests.toSet()..addAll(_activeLoadTests);
+    var allLiveTests = liveTests.toSet()
+      ..addAll(_activeLoadTests)
+      ..addAll(_hidden);
     var futures = allLiveTests.map((liveTest) => liveTest.close()).toList();
 
     // Closing the load pool will close the test suites as soon as their tests
diff --git a/pubspec.yaml b/pubspec.yaml
index a342a45..e936143 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: test
-version: 0.12.6-dev
+version: 0.12.5+1
 author: Dart Team <misc@dartlang.org>
 description: A library for writing dart unit tests.
 homepage: https://github.com/dart-lang/test