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

sdk/lib/_internal/pub_generated/test/transformer/can_log_messages_test.dart

-// Copyright (c) 2013, 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:scheduled_test/scheduled_test.dart';
-import 'package:scheduled_test/scheduled_stream.dart';
-
-import '../../lib/src/exit_codes.dart' as exit_codes;
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-
-const SOURCE_MAPS_TRANSFORMER = """
-import 'dart:async';
-
-import 'package:barback/barback.dart';
-import 'package:source_maps/source_maps.dart';
-
-class RewriteTransformer extends Transformer {
-  RewriteTransformer.asPlugin();
-
-  String get allowedExtensions => '.txt';
-
-  Future apply(Transform transform) {
-    transform.logger.info('info!');
-    transform.logger.warning('Warning!',
-        asset: transform.primaryInput.id.changeExtension('.foo'));
-    var sourceFile = new SourceFile.text(
-        'http://fake.com/not_real.dart',
-        'not a real\\ndart file');
-    transform.logger.error('ERROR!', span: new FileSpan(sourceFile, 11));
-    return transform.primaryInput.readAsString().then((contents) {
-      var id = transform.primaryInput.id.changeExtension(".out");
-      transform.addOutput(new Asset.fromString(id, "\$contents.out"));
-    });
-  }
-}
-""";
-
-const SOURCE_SPAN_TRANSFORMER = """
-import 'dart:async';
-
-import 'package:barback/barback.dart';
-import 'package:source_span/source_span.dart';
-
-class RewriteTransformer extends Transformer {
-  RewriteTransformer.asPlugin();
-
-  String get allowedExtensions => '.txt';
-
-  Future apply(Transform transform) {
-    transform.logger.info('info!');
-    transform.logger.warning('Warning!',
-        asset: transform.primaryInput.id.changeExtension('.foo'));
-    var sourceFile = new SourceFile('not a real\\ndart file',
-        url: 'http://fake.com/not_real.dart');
-    transform.logger.error('ERROR!', span: sourceFile.span(11, 12));
-    return transform.primaryInput.readAsString().then((contents) {
-      var id = transform.primaryInput.id.changeExtension(".out");
-      transform.addOutput(new Asset.fromString(id, "\$contents.out"));
-    });
-  }
-}
-""";
-
-main() {
-  initConfig();
-  // This intentionally tests barback 0.14.2 with both transformers, since it
-  // supports both types of span.
-  withBarbackVersions("<0.15.0", () => runTest(SOURCE_MAPS_TRANSFORMER));
-  withBarbackVersions(">=0.14.2", () => runTest(SOURCE_SPAN_TRANSFORMER));
-}
-
-void runTest(String transformerText) {
-  integration("can log messages", () {
-    d.dir(appPath, [d.pubspec({
-        "name": "myapp",
-        "transformers": ["myapp/src/transformer"]
-      }),
-          d.dir("lib", [d.dir("src", [d.file("transformer.dart", transformerText)])]),
-          d.dir("web", [d.file("foo.txt", "foo")])]).create();
-
-    createLockFile('myapp', pkg: ['barback']);
-
-    var pub = startPub(args: ["build"]);
-    pub.stdout.expect(startsWith("Loading source assets..."));
-    pub.stdout.expect(consumeWhile(matches("Loading .* transformers...")));
-    pub.stdout.expect(startsWith("Building myapp..."));
-
-    pub.stdout.expect(emitsLines("""
-[Rewrite on myapp|web/foo.txt]:
-info!"""));
-
-    pub.stderr.expect(emitsLines("""
-[Rewrite on myapp|web/foo.txt with input myapp|web/foo.foo]:
-Warning!
-[Rewrite on myapp|web/foo.txt]:"""));
-
-    // The details of the analyzer's error message change pretty frequently,
-    // so instead of validating the entire line, just look for a couple of
-    // salient bits of information.
-    pub.stderr.expect(allOf([contains("2"), // The line number.
-      contains("1"), // The column number.
-      contains("http://fake.com/not_real.dart"), // The library.
-      contains("ERROR"), // That it's an error.
-    ]));
-
-    // In barback >=0.15.0, the span will point to the location where the error
-    // occurred.
-    pub.stderr.expect(allow(inOrder(["d", "^"])));
-
-    pub.stderr.expect("Build failed.");
-
-    pub.shouldExit(exit_codes.DATA);
-  });
-}