anchor.diff:  
       test("directly", () {
         d.file("test.dart", _success).create();
  -      var test = runDart([
  -        "--package-root=${p.join(packageDir, 'packages')}",
  -        "test.dart"
  -      ]);
  +      var test = runDart(["test.dart"]);
   
         test.stdout.expect(consumeThrough(contains("All tests passed!")));
         test.shouldExit(0);
  
positive.code: 
      test("directly", () {
        d.file("test.dart", _failure).create();
        var test = runDart([
          "--package-root=${p.join(packageDir, 'packages')}",
          "test.dart"
        ]);
        test.stdout.expect(consumeThrough(contains("Some tests failed.")));
        test.shouldExit(255);
      });
  
negative.code: import 'dart:io';
  import 'dart:math' as math;
  
  import 'package:scheduled_test/descriptor.dart' as d;
  import 'package:scheduled_test/scheduled_stream.dart';
  import 'package:scheduled_test/scheduled_test.dart';
  