Add an Environment class that's exposed through RunnerSuite.

test/runner/load_suite_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:async';
 
 import 'package:test/src/backend/state.dart';
 import 'package:test/src/backend/test_platform.dart';
 import 'package:test/src/runner/load_exception.dart';
 import 'package:test/src/runner/load_suite.dart';
 import 'package:test/src/runner/runner_suite.dart';
+import 'package:test/src/runner/vm/environment.dart';
 import 'package:test/test.dart';
 
 import '../utils.dart';
 
 void main() {
+  var innerSuite;
+  setUp(() => innerSuite = new RunnerSuite(const VMEnvironment(), []));
+
   test("running a load test causes LoadSuite.suite to emit a suite", () async {
-    var innerSuite = new RunnerSuite([]);
     var suite = new LoadSuite("name", () => new Future.value(innerSuite));
     expect(suite.tests, hasLength(1));
 
     expect(suite.suite, completion(equals(innerSuite)));
     var liveTest = await suite.tests.single.load(suite);
     await liveTest.run();
     expectTestPassed(liveTest);
   });
 
   test("running a load suite's body may be synchronous", () async {
-    var innerSuite = new RunnerSuite([]);
     var suite = new LoadSuite("name", () => innerSuite);
     expect(suite.tests, hasLength(1));
 
     expect(suite.suite, completion(equals(innerSuite)));
     var liveTest = await suite.tests.single.load(suite);
     await liveTest.run();
     expectTestPassed(liveTest);
   });
 
   test("a load test doesn't complete until the body returns", () async {
     var completer = new Completer();
     var suite = new LoadSuite("name", () => completer.future);
     expect(suite.tests, hasLength(1));
 
     var liveTest = await suite.tests.single.load(suite);
     expect(liveTest.run(), completes);
     await new Future.delayed(Duration.ZERO);
     expect(liveTest.state.status, equals(Status.running));
 
-    completer.complete(new RunnerSuite([]));
+    completer.complete(innerSuite);
     await new Future.delayed(Duration.ZERO);
     expectTestPassed(liveTest);
   });
 
   test("a load test forwards errors and completes LoadSuite.suite to null",
       () async {
     var suite = new LoadSuite("name", () => fail("error"));
     expect(suite.tests, hasLength(1));
 
     expect(suite.suite, completion(isNull));
@@ skipping 26 matching lines @@
     var liveTest = await suite.tests.single.load(suite);
     await liveTest.run();
     expect(liveTest.state.status, equals(Status.complete));
     expect(liveTest.state.result, equals(Result.error));
     expect(liveTest.errors, hasLength(1));
     expect(liveTest.errors.first.error, equals(exception));
   });
 
   test("forSuite() creates a load suite that completes to a test suite",
       () async {
-    var innerSuite = new RunnerSuite([]);
     var suite = new LoadSuite.forSuite(innerSuite);
     expect(suite.tests, hasLength(1));
 
     expect(suite.suite, completion(equals(innerSuite)));
     var liveTest = await suite.tests.single.load(suite);
     await liveTest.run();
     expectTestPassed(liveTest);
   });
 
   group("changeSuite()", () {
     test("returns a new load suite with the same properties", () {
-      var innerSuite = new RunnerSuite([]);
       var suite = new LoadSuite("name", () => innerSuite,
           platform: TestPlatform.vm);
       expect(suite.tests, hasLength(1));
 
       var newSuite = suite.changeSuite((suite) => suite);
       expect(newSuite.platform, equals(TestPlatform.vm));
       expect(newSuite.tests, equals(suite.tests));
     });
 
     test("changes the inner suite", () async {
-      var innerSuite = new RunnerSuite([]);
       var suite = new LoadSuite("name", () => innerSuite);
       expect(suite.tests, hasLength(1));
 
-      var newInnerSuite = new RunnerSuite([]);
+      var newInnerSuite = new RunnerSuite(const VMEnvironment(), []);
       var newSuite = suite.changeSuite((suite) => newInnerSuite);
       expect(newSuite.suite, completion(equals(newInnerSuite)));
 
       var liveTest = await suite.tests.single.load(suite);
       await liveTest.run();
       expectTestPassed(liveTest);
     });
 
     test("doesn't run change() if the suite is null", () async {
       var suite = new LoadSuite("name", () => null);
       expect(suite.tests, hasLength(1));
 
       var newSuite = suite.changeSuite(expectAsync((_) {}, count: 0));
       expect(newSuite.suite, completion(isNull));
 
       var liveTest = await suite.tests.single.load(suite);
       await liveTest.run();
       expectTestPassed(liveTest);
     });
   });
 
   group("getSuite()", () {
     test("runs the test and returns the suite", () {
-      var innerSuite = new RunnerSuite([]);
       var suite = new LoadSuite.forSuite(innerSuite);
       expect(suite.tests, hasLength(1));
 
       expect(suite.getSuite(), completion(equals(innerSuite)));
     });
 
     test("forwards errors to the future", () {
       var suite = new LoadSuite("name", () => throw "error");
       expect(suite.tests, hasLength(1));
 
       expect(suite.getSuite(), throwsA("error"));
     });
   });
 }