Revert "Revert "Use native async/await support in pub.""

sdk/lib/_internal/pub_generated/test/dependency_computer/utils.dart

Index: sdk/lib/_internal/pub_generated/test/dependency_computer/utils.dart
diff --git a/sdk/lib/_internal/pub_generated/test/dependency_computer/utils.dart b/sdk/lib/_internal/pub_generated/test/dependency_computer/utils.dart
deleted file mode 100644
index 33b1bf76431903a5d513c7ee192d423520a6a622..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/test/dependency_computer/utils.dart
+++ /dev/null
@@ -1,129 +0,0 @@
-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.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 pub_tests;
-
-import 'package:barback/barback.dart';
-import 'package:path/path.dart' as p;
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../../lib/src/barback/cycle_exception.dart';
-import '../../lib/src/barback/dependency_computer.dart';
-import '../../lib/src/entrypoint.dart';
-import '../../lib/src/io.dart';
-import '../../lib/src/package.dart';
-import '../../lib/src/package_graph.dart';
-import '../../lib/src/source/path.dart';
-import '../../lib/src/system_cache.dart';
-import '../../lib/src/utils.dart';
-import '../test_pub.dart';
-
-/// Expects that [DependencyComputer.transformersNeededByTransformers] will
-/// return a graph matching [expected] when run on the package graph defined by
-/// packages in the sandbox.
-void expectDependencies(Map<String, Iterable<String>> expected) {
-  expected = mapMap(expected, value: (_, ids) => ids.toSet());
-
-  schedule(() {
-    var computer = new DependencyComputer(_loadPackageGraph());
-    var result = mapMap(
-        computer.transformersNeededByTransformers(),
-        key: (id, _) => id.toString(),
-        value: (_, ids) => ids.map((id) => id.toString()).toSet());
-    expect(result, equals(expected));
-  }, "expect dependencies to match $expected");
-}
-
-/// Expects that [computeTransformersNeededByTransformers] will throw an
-/// exception matching [matcher] when run on the package graph defiend by
-/// packages in the sandbox.
-void expectException(matcher) {
-  schedule(() {
-    expect(() {
-      var computer = new DependencyComputer(_loadPackageGraph());
-      computer.transformersNeededByTransformers();
-    }, throwsA(matcher));
-  }, "expect an exception: $matcher");
-}
-
-/// Expects that [computeTransformersNeededByTransformers] will throw a
-/// [CycleException] with the given [steps] when run on the package graph
-/// defiend by packages in the sandbox.
-void expectCycleException(Iterable<String> steps) {
-  expectException(predicate((error) {
-    expect(error, new isInstanceOf<CycleException>());
-    expect(error.steps, equals(steps));
-    return true;
-  }, "cycle exception:\n${steps.map((step) => "  $step").join("\n")}"));
-}
-
-/// Expects that [DependencyComputer.transformersNeededByLibrary] will return
-/// transformer ids matching [expected] when run on the library identified by
-/// [id].
-void expectLibraryDependencies(String id, Iterable<String> expected) {
-  expected = expected.toSet();
-
-  schedule(() {
-    var computer = new DependencyComputer(_loadPackageGraph());
-    var result = computer.transformersNeededByLibrary(
-        new AssetId.parse(id)).map((id) => id.toString()).toSet();
-    expect(result, equals(expected));
-  }, "expect dependencies to match $expected");
-}
-
-/// Loads a [PackageGraph] from the packages in the sandbox.
-///
-/// This graph will also include barback and its transitive dependencies from
-/// the repo.
-PackageGraph _loadPackageGraph() {
-  // Load the sandbox packages.
-  var packages = {};
-
-  var systemCache = new SystemCache(p.join(sandboxDir, cachePath));
-  systemCache.sources
-      ..register(new PathSource())
-      ..setDefault('path');
-  var entrypoint = new Entrypoint(p.join(sandboxDir, appPath), systemCache);
-
-  for (var package in listDir(sandboxDir)) {
-    if (!fileExists(p.join(package, 'pubspec.yaml'))) continue;
-    var packageName = p.basename(package);
-    packages[packageName] =
-        new Package.load(packageName, package, systemCache.sources);
-  }
-
-  loadPackage(packageName) {
-    if (packages.containsKey(packageName)) return;
-    packages[packageName] =
-        new Package.load(packageName, packagePath(packageName), systemCache.sources);
-    for (var dep in packages[packageName].dependencies) {
-      loadPackage(dep.name);
-    }
-  }
-
-  loadPackage('barback');
-
-  return new PackageGraph(entrypoint, null, packages);
-}
-
-/// Returns the contents of a no-op transformer that imports each URL in
-/// [imports].
-String transformer([Iterable<String> imports]) {
-  if (imports == null) imports = [];
-
-  var buffer =
-      new StringBuffer()..writeln('import "package:barback/barback.dart";');
-  for (var import in imports) {
-    buffer.writeln('import "$import";');
-  }
-
-  buffer.writeln("""
-NoOpTransformer extends Transformer {
-  bool isPrimary(AssetId id) => true;
-  void apply(Transform transform) {}
-}
-""");
-
-  return buffer.toString();
-}