Fix tests that invoke Dart explicitly.

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:path/path.dart' as p;
 import 'package:scheduled_test/descriptor.dart' as d;
 import 'package:scheduled_test/scheduled_stream.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:test/src/util/exit_codes.dart' as exit_codes;
 
 import '../io.dart';
 
 final _success = """
 import 'dart:async';
 
@@ skipping 253 matching lines @@
         return d.file("${i}_test.dart", _success);
       })).create();
 
       var test = runTest([]);
       test.stdout.expect(consumeThrough(contains("+3: All tests passed!")));
       test.shouldExit(0);
     });
 
     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);
     });
 
     // Regression test; this broke in 0.12.0-beta.9.
     test("on a file in a subdirectory", () {
       d.dir("dir", [d.file("test.dart", _success)]).create();
 
       var test = runTest(["dir/test.dart"]);
@@ skipping 26 matching lines @@
         return d.file("${i}_test.dart", _failure);
       })).create();
 
       var test = runTest([]);
       test.stdout.expect(consumeThrough(contains("-3: Some tests failed.")));
       test.shouldExit(1);
     });
 
     test("directly", () {
       d.file("test.dart", _failure).create();
-      var test = runDart([
-        "--package-root=${p.join(packageDir, 'packages')}",
-        "test.dart"
-      ]);
+      var test = runDart(["test.dart"]);
       test.stdout.expect(consumeThrough(contains("Some tests failed.")));
       test.shouldExit(255);
     });
   });
 
   test("runs tests even when a file fails to load", () {
     d.file("test.dart", _success).create();
 
     var test = runTest(["test.dart", "nonexistent.dart"]);
     test.stdout.expect(consumeThrough(contains("+1 -1: Some tests failed.")));
@@ skipping 325 matching lines @@
         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);
       });
     });
   });
 }