Add a LoadSuite class.

test/runner/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 35 matching lines @@
 
   group(".loadFile()", () {
     var suite;
     setUp(() async {
       /// TODO(nweiz): Use scheduled_test for this once it's compatible with
       /// this version of test.
       new File(p.join(_sandbox, 'a_test.dart')).writeAsStringSync(_tests);
       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('VM'));
     });
 
     test("returns tests with the correct names and platforms", () {
       expect(suite.tests, hasLength(3));
       expect(suite.tests[0].name, equals("success"));
@@ skipping 50 matching lines @@
       setUp(() async {
         /// TODO(nweiz): Use scheduled_test for this once it's compatible with
         /// this version of test.
         new File(p.join(_sandbox, 'a_test.dart')).writeAsStringSync(_tests);
         new File(p.join(_sandbox, 'another_test.dart'))
             .writeAsStringSync(_tests);
         new Directory(p.join(_sandbox, 'dir')).createSync();
         new File(p.join(_sandbox, 'dir/sub_test.dart'))
             .writeAsStringSync(_tests);
 
-        suites = await _loader.loadDir(_sandbox).toList();
+        suites = await _loader.loadDir(_sandbox)
+            .asyncMap((loadSuite) => loadSuite.getSuite())
+            .toList();
       });
 
       test("gives those suites the correct paths", () {
         expect(suites.map((suite) => suite.path), unorderedEquals([
           p.join(_sandbox, 'a_test.dart'),
           p.join(_sandbox, 'another_test.dart'),
           p.join(_sandbox, 'dir', 'sub_test.dart')
         ]));
       });
 
       test("can run tests in those suites", () {
         var suite = suites.firstWhere((suite) => suite.path.contains("a_test"));
         var liveTest = suite.tests[1].load(suite);
         expectSingleFailure(liveTest);
         return liveTest.run().whenComplete(() => liveTest.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);
+  });
+
+  // TODO: Test load suites. Don't forget to test that prints in loaded files
+  // are piped through the suite. Also for browser tests!
+}