Support tag configuration.

test/runner/tag_test.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.
 
 @TestOn("vm")
 
 import 'package:scheduled_test/descriptor.dart' as d;
 import 'package:scheduled_test/scheduled_stream.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
@@ skipping 160 matching lines @@
       d.file("test.dart", """
         import 'package:test/test.dart';
 
         void main() {
           test("foo", () {}, tags: ["a", "b"]);
         }
       """).create();
 
       var test = runTest(["test.dart"]);
       test.stdout.expect(consumeThrough(lines(
-          'Warning: Tags were used that weren\'t specified on the command '
-            'line.\n'
+          'Warning: Tags were used that weren\'t specified in dart_test.yaml.\n'
           '  a was used in the test "foo"\n'
           '  b was used in the test "foo"')));
       test.shouldExit(0);
     });
 
     test("for multiple tests", () {
       d.file("test.dart", """
         import 'package:test/test.dart';
 
         void main() {
           test("foo", () {}, tags: "a");
           test("bar", () {}, tags: "a");
         }
       """).create();
 
       var test = runTest(["test.dart"]);
       test.stdout.expect(consumeThrough(lines(
-          'Warning: A tag was used that wasn\'t specified on the command '
-            'line.\n'
+          'Warning: A tag was used that wasn\'t specified in dart_test.yaml.\n'
           '  a was used in:\n'
           '    the test "foo"\n'
           '    the test "bar"')));
       test.shouldExit(0);
     });
 
     test("for groups", () {
       d.file("test.dart", """
         import 'package:test/test.dart';
 
         void main() {
           group("group", () {
             test("foo", () {});
             test("bar", () {});
           }, tags: "a");
         }
       """).create();
 
       var test = runTest(["test.dart"]);
       test.stdout.expect(consumeThrough(lines(
-          'Warning: A tag was used that wasn\'t specified on the command '
-            'line.\n'
+          'Warning: A tag was used that wasn\'t specified in dart_test.yaml.\n'
           '  a was used in the group "group"')));
       test.shouldExit(0);
     });
 
     test("for suites", () {
       d.file("test.dart", """
         @Tags(const ["a"])
         import 'package:test/test.dart';
 
         void main() {
           test("foo", () {});
           test("bar", () {});
         }
       """).create();
 
       var test = runTest(["test.dart"]);
       test.stdout.expect(consumeThrough(lines(
-          'Warning: A tag was used that wasn\'t specified on the command '
-            'line.\n'
+          'Warning: A tag was used that wasn\'t specified in dart_test.yaml.\n'
           '  a was used in the suite itself')));
       test.shouldExit(0);
     });
 
     test("doesn't double-print a tag warning", () {
       d.file("test.dart", """
         import 'package:test/test.dart';
 
         void main() {
           test("foo", () {}, tags: "a");
         }
       """).create();
 
       var test = runTest(["-p", "vm,content-shell", "test.dart"]);
       test.stdout.expect(consumeThrough(lines(
-          'Warning: A tag was used that wasn\'t specified on the command '
-            'line.\n'
+          'Warning: A tag was used that wasn\'t specified in dart_test.yaml.\n'
           '  a was used in the test "foo"')));
       test.stdout.expect(never(startsWith("Warning:")));
       test.shouldExit(0);
     });
   });
 
   group("invalid tags", () {
     test("are disallowed by test()", () {
       d.file("test.dart", """
         import 'package:test/test.dart';
@@ skipping 47 matching lines @@
       test.shouldExit(1);
     });
   });
 }
 
 /// Returns a [StreamMatcher] that asserts that a test emits warnings for [tags]
 /// in order.
 StreamMatcher tagWarnings(List<String> tags) => inOrder(() sync* {
   yield consumeThrough(
       "Warning: ${tags.length == 1 ? 'A tag was' : 'Tags were'} used that "
-        "${tags.length == 1 ? "wasn't" : "weren't"} specified on the command "
-        "line.");
+        "${tags.length == 1 ? "wasn't" : "weren't"} specified in "
+        "dart_test.yaml.");
 
   for (var tag in tags) {
     yield consumeWhile(isNot(contains(" was used in")));
     yield consumeThrough(startsWith("  $tag was used in"));
   }
 
   // Consume until the end of the warning block, and assert that it has no
   // further tags than the ones we specified.
   yield consumeWhile(isNot(anyOf([contains(" was used in"), isEmpty])));
   yield isEmpty;
 }());
 
 /// Returns a [StreamMatcher] that matches the lines of [string] in order.
 StreamMatcher lines(String string) => inOrder(string.split("\n"));