Add test- and group-level support for skipping tests.

lib/src/backend/declarer.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.backend.declarer;
 
 import 'dart:collection';
 
 import '../frontend/timeout.dart';
 import 'group.dart';
@@ skipping 20 matching lines @@
   /// The description will be added to the descriptions of any surrounding
   /// [group]s.
   ///
   /// If [testOn] is passed, it's parsed as a [PlatformSelector], and the test
   /// will only be run on matching platforms.
   ///
   /// If [timeout] is passed, it's used to modify or replace the default timeout
   /// of 30 seconds. Timeout modifications take precedence in suite-group-test
   /// order, so [timeout] will also modify any timeouts set on the group or
   /// suite.
-  void test(String description, body(), {String testOn, Timeout timeout}) {
+  ///
+  /// If [skip] is a String or `true`, the test is skipped. If it's a String, it
+  /// should explain why the test is skipped; this reason will be printed in
+  /// lieu of running the test.

[kevmoo, 2015/04/17 22:53:34]

in lieu -> instead

more simple English are better

[nweiz, 2015/04/17 22:56:12]

Done.

+  void test(String description, body(), {String testOn, Timeout timeout,
+      skip}) {
     // TODO(nweiz): Once tests have begun running, throw an error if [test] is
     // called.
     var prefix = _group.description;
     if (prefix != null) description = "$prefix $description";
 
     var metadata = _group.metadata.merge(
-        new Metadata.parse(testOn: testOn, timeout: timeout));
+        new Metadata.parse(testOn: testOn, timeout: timeout, skip: skip));
     var group = _group;
     _tests.add(new LocalTest(description, metadata, () {
       // TODO(nweiz): It might be useful to throw an error here if a test starts
       // running while other tests from the same declarer are also running,
       // since they might share closurized state.
       return group.runSetUp().then((_) => body());
     }, tearDown: group.runTearDown));
   }
 
   /// Creates a group of tests.
   ///
   /// A group's description is included in the descriptions of any tests or
   /// sub-groups it contains. [setUp] and [tearDown] are also scoped to the
   /// containing group.
   ///
   /// If [testOn] is passed, it's parsed as a [PlatformSelector], and any tests
   /// in the group will only be run on matching platforms.
   ///
   /// If [timeout] is passed, it's used to modify or replace the default timeout
   /// of 30 seconds. Timeout modifications take precedence in suite-group-test
   /// order, so [timeout] will also modify any timeouts set on the group or
   /// suite.
+  ///
+  /// If [skip] is a String or `true`, the group is skipped. If it's a String,
+  /// it should explain why the group is skipped; this reason will be printed in
+  /// lieu of running the group's tests.

[kevmoo, 2015/04/17 22:53:34]

same righch 'ere

   void group(String description, void body(), {String testOn,
-      Timeout timeout}) {
+      Timeout timeout, skip}) {
     var oldGroup = _group;
 
-    var metadata = new Metadata.parse(testOn: testOn, timeout: timeout);
+    var metadata = new Metadata.parse(
+        testOn: testOn, timeout: timeout, skip: skip);
+
+    // Don' load the tests for a skipped group.
+    if (metadata.skip) {
+      _tests.add(new LocalTest(description, metadata, () {}));
+      return;
+    }
+
     _group = new Group(oldGroup, description, metadata);
     try {
       body();
     } finally {
       _group = oldGroup;
     }
   }
 
   /// Registers a function to be run before tests.
   ///
@@ skipping 22 matching lines @@
   /// groups or at the top level.
   void tearDown(callback()) {
     if (_group.tearDown != null) {
       throw new StateError("tearDown() may not be called multiple times for "
           "the same group.");
     }
 
     _group.tearDown = callback;
   }
 }