feature: tag tests; choose tags on command line

test/runner/runner_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 'dart:io';
 import 'dart:math' as math;
 
 import 'package:scheduled_test/descriptor.dart' as d;
@@ skipping 654 matching lines @@
       test("produces an error when no tests match", () {
         d.file("test.dart", _success).create();
 
         var test = runTest(["--plain-name", "no match", "test.dart"]);
         test.stderr.expect(
             consumeThrough(contains('No tests match "no match".')));
         test.shouldExit(exit_codes.data);
       });
     });
   });
+
+  group("tags", () {

[nweiz, 2015/11/03 00:43:16]

I'm trying to keep runner_test.dart from getting more bloated. Can you move this
to its own file?

[yjbanov, 2015/11/11 06:40:20]

Done.

+    test("runs only tests containing specified tags", () {
+      d.file("test.dart", """
+import 'package:test/test.dart';
+
+void main() {
+  test("no tags", () {});
+  test("a", () {}, tags: "a");
+  test("b", () {}, tags: "b");
+  test("bc", () {}, tags: "b,c");
 }
+""").create();
+
+      var test;
+
+      /// [warnings] contains pairs, each containing a comma-separated list of
+      /// tags the warning is about and the test name.
+      expectTagWarnings(List<List<String>> warnings) {
+        for (var warning in warnings) {
+          test.stderr.expect(consumeThrough(contains(
+              "WARNING: unrecognized tags {${warning[0]}}"
+              " in test '${warning[1]}'")));
+        }
+        test.stderr.expect(isDone);
+      }
+
+      test = runTest(["test.dart"]);
+      test.stdout.expect(consumeThrough(contains("+4: All tests passed!")));
+      expectTagWarnings([
+        ['a', 'a'],
+        ['b', 'b'],
+        ['b, c', 'bc'],
+      ]);
+      test.shouldExit(0);
+
+      test = runTest(["--tags=a", "test.dart"]);
+      test.stdout.expect(consumeThrough(contains("+1: All tests passed!")));
+      expectTagWarnings([
+        ['b', 'b'],
+        ['b, c', 'bc'],
+      ]);
+      test.shouldExit(0);
+
+      test = runTest(["--tags=b", "test.dart"]);
+      test.stdout.expect(consumeThrough(contains("+2: All tests passed!")));
+      expectTagWarnings([
+        ['a', 'a'],
+        ['c', 'bc'],
+      ]);
+      test.shouldExit(0);
+
+      test = runTest(["--tags=c", "test.dart"]);
+      test.stdout.expect(consumeThrough(contains("+1: All tests passed!")));
+      expectTagWarnings([
+        ['a', 'a'],
+        ['b', 'b'],
+        ['b', 'bc'],
+      ]);
+      test.shouldExit(0);
+
+      test = runTest(["--tags=a,b,c", "test.dart"]);
+      test.stdout.expect(consumeThrough(contains("+3: All tests passed!")));
+      expectTagWarnings([]);
+      test.shouldExit(0);
+    });
+
+    test("takes -t abbreviation and --tag typo", () {
+      d.file("test.dart", """
+import 'package:test/test.dart';
+
+void main() {
+  test("no tags", () {});
+  test("a", () {}, tags: "a");
+}
+""").create();
+
+      var test = runTest(["test.dart"]);
+      test.stdout.expect(consumeThrough(contains("+2: All tests passed!")));
+      test.shouldExit(0);
+
+      test = runTest(["-t", "a", "test.dart"]);
+      test.stdout.expect(consumeThrough(contains("+1: All tests passed!")));
+      test.shouldExit(0);
+
+      test = runTest(["--tag=a", "test.dart"]);
+      test.stdout.expect(consumeThrough(contains("+1: All tests passed!")));
+      test.shouldExit(0);
+    });
+  });
+}