Remove barback from the repo.

pkg/barback/test/package_graph/repetition_test.dart

-// Copyright (c) 2013, 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 barback.test.package_graph.transform_test;
-
-import 'package:barback/src/utils.dart';
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../utils.dart';
-
-// This tests the behavior of barback under many operations happening in quick
-// succession. Since Barback is so asynchronous, it's easy for it to have subtle
-// dependencies on the commonly-used and -tested usage patterns. These tests
-// exist to stress-test less-common usage patterns in order to root out
-// additional bugs.
-
-main() {
-  initConfig();
-
-  test("updates sources many times", () {
-    initGraph(["app|foo.txt"], {
-      "app": [[new RewriteTransformer("txt", "out")]]
-    });
-
-    for (var i = 0; i < 1000; i++) {
-      updateSources(["app|foo.txt"]);
-    }
-
-    expectAsset("app|foo.out", "foo.out");
-    buildShouldSucceed();
-  });
-
-  test("updates and then removes sources many times", () {
-    initGraph(["app|foo.txt"], {
-      "app": [[new RewriteTransformer("txt", "out")]]
-    });
-
-    for (var i = 0; i < 1000; i++) {
-      updateSources(["app|foo.txt"]);
-      removeSources(["app|foo.txt"]);
-    }
-
-    expectNoAsset("app|foo.out");
-    expectNoAsset("app|foo.txt");
-    buildShouldSucceed();
-  });
-
-  test("updates transformers many times", () {
-    var rewrite = new RewriteTransformer("txt", "out");
-    initGraph(["app|foo.txt"], {"app": [[rewrite]]});
-    updateSources(["app|foo.txt"]);
-
-    for (var i = 0; i < 1000; i++) {
-      updateTransformers("app", [[rewrite]]);
-    }
-
-    expectAsset("app|foo.out", "foo.out");
-    buildShouldSucceed();
-  });
-
-  test("updates and removes transformers many times", () {
-    var rewrite = new RewriteTransformer("txt", "out");
-    initGraph(["app|foo.txt"], {"app": [[rewrite]]});
-    updateSources(["app|foo.txt"]);
-
-    for (var i = 0; i < 1000; i++) {
-      updateTransformers("app", [[rewrite]]);
-      updateTransformers("app", [[]]);
-    }
-
-    expectAsset("app|foo.txt", "foo");
-    expectNoAsset("app|foo.out");
-    buildShouldSucceed();
-  });
-}