Add a LoadSuite class.

test/runner/browser/loader_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 'package:path/path.dart' as p;
 import 'package:test/src/backend/state.dart';
@@ skipping 36 matching lines @@
     return _loader.close();
   });
 
   group(".loadFile()", () {
     var suite;
     setUp(() async {
       var suites = await _loader.loadFile(p.join(_sandbox, 'a_test.dart'))
           .toList();
 
       expect(suites, hasLength(1));
-      suite = suites.first;
+      var loadSuite = suites.first;
+      suite = await loadSuite.getSuite();
     });
 
     test("returns a suite with the file path and platform", () {
       expect(suite.path, equals(p.join(_sandbox, 'a_test.dart')));
       expect(suite.platform, equals('Chrome'));
     });
 
     test("returns tests with the correct names", () {
       expect(suite.tests, hasLength(3));
       expect(suite.tests[0].name, equals("success"));
@@ skipping 38 matching lines @@
         test("error", () => throw 'oh no');
       });
     });
   });
 }
 """);
 
     var suites = await _loader.loadFile(p.join(_sandbox, 'a_test.dart'))
         .toList();
     expect(suites, hasLength(1));
-    var suite = suites.first;
+    var loadSuite = suites.first;
+    var suite = await loadSuite.getSuite();
     expect(suite.tests, hasLength(3));
     expect(suite.tests[0].name, equals("success"));
     expect(suite.tests[1].name, equals("failure"));
     expect(suite.tests[2].name, equals("error"));
   });
 
   test("loads a suite both in the browser and the VM", () async {
     var loader = new Loader([TestPlatform.vm, TestPlatform.chrome],
         root: _sandbox,
         packageRoot: p.join(packageDir, 'packages'));
     var path = p.join(_sandbox, 'a_test.dart');
 
     try {
-      var suites = await loader.loadFile(path).toList();
+      var suites = await loader.loadFile(path)
+          .asyncMap((loadSuite) => loadSuite.getSuite()).toList();
       expect(suites[0].platform, equals('VM'));
       expect(suites[0].path, equals(path));
       expect(suites[1].platform, equals('Chrome'));
       expect(suites[1].path, equals(path));
 
       for (var suite in suites) {
         expect(suite.tests, hasLength(3));
         expect(suite.tests[0].name, equals("success"));
         expect(suite.tests[1].name, equals("failure"));
         expect(suite.tests[2].name, equals("error"));
       }
     } finally {
       await loader.close();
     }
   });
+
+  test("a print in a loaded file is piped through the LoadSuite", () async {
+    new File(p.join(_sandbox, 'a_test.dart')).writeAsStringSync("""
+void main() {
+  print('print within test');
 }
+""");
+    var suites = await _loader.loadFile(p.join(_sandbox, 'a_test.dart'))
+        .toList();
+    expect(suites, hasLength(1));
+    var loadSuite = suites.first;
+
+    var liveTest = await loadSuite.tests.single.load(loadSuite);
+    expect(liveTest.onPrint.first, completion(equals("print within test")));
+    await liveTest.run();
+    expectTestPassed(liveTest);
+  });
+}