More gracefully handle load errors.

test/runner/browser/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 'package:path/path.dart' as p;
 import 'package:test/src/util/exit_codes.dart' as exit_codes;
@@ skipping 24 matching lines @@
   });
 
   group("fails gracefully if", () {
     test("a test file fails to compile", () {
       var testPath = p.join(_sandbox, "test.dart");
       new File(testPath).writeAsStringSync("invalid Dart file");
       var result = _runUnittest(["-p", "chrome", "test.dart"]);
 
       expect(result.stdout,
           contains("Expected a declaration, but got 'invalid'"));
-      expect(result.stderr, equals(
-          'Failed to load "${p.relative(testPath, from: _sandbox)}": dart2js '
-            'failed.\n'));
-      expect(result.exitCode, equals(exit_codes.data));
+      expect(result.stdout, allOf([
+        contains('-1: load error'),
+        contains(
+            'Failed to load "${p.relative(testPath, from: _sandbox)}": dart2js '
+                'failed.')
+      ]));
+      expect(result.exitCode, equals(1));
     });
 
     test("a test file throws", () {
       var testPath = p.join(_sandbox, "test.dart");
       new File(testPath).writeAsStringSync("void main() => throw 'oh no';");
 
       var result = _runUnittest(["-p", "chrome", "test.dart"]);
-      expect(result.stderr, startsWith(
-          'Failed to load "${p.relative(testPath, from: _sandbox)}": oh no\n'));
-      expect(result.exitCode, equals(exit_codes.data));
+      expect(result.stdout, allOf([
+        contains('-1: load error'),
+        contains(
+            'Failed to load "${p.relative(testPath, from: _sandbox)}": oh no')
+      ]));
+      expect(result.exitCode, equals(1));
     });
 
     test("a test file doesn't have a main defined", () {
       var testPath = p.join(_sandbox, "test.dart");
       new File(testPath).writeAsStringSync("void foo() {}");
 
       var result = _runUnittest(["-p", "chrome", "test.dart"]);
-      expect(result.stderr, startsWith(
-          'Failed to load "${p.relative(testPath, from: _sandbox)}": No '
-              'top-level main() function defined.\n'));
-      expect(result.exitCode, equals(exit_codes.data));
+      expect(result.stdout, allOf([
+        contains('-1: load error'),
+        contains(
+            'Failed to load "${p.relative(testPath, from: _sandbox)}": No '
+                'top-level main() function defined.')
+      ]));
+      expect(result.exitCode, equals(1));
     });
 
     test("a test file has a non-function main", () {
       var testPath = p.join(_sandbox, "test.dart");
       new File(testPath).writeAsStringSync("int main;");
 
       var result = _runUnittest(["-p", "chrome", "test.dart"]);
-      expect(result.stderr, startsWith(
-          'Failed to load "${p.relative(testPath, from: _sandbox)}": Top-level '
-              'main getter is not a function.\n'));
-      expect(result.exitCode, equals(exit_codes.data));
+      expect(result.stdout, allOf([
+        contains('-1: load error'),
+        contains(
+            'Failed to load "${p.relative(testPath, from: _sandbox)}": '
+                'Top-level main getter is not a function.\n')
+      ]));
+      expect(result.exitCode, equals(1));
     });
 
     test("a test file has a main with arguments", () {
       var testPath = p.join(_sandbox, "test.dart");
       new File(testPath).writeAsStringSync("void main(arg) {}");
 
       var result = _runUnittest(["-p", "chrome", "test.dart"]);
-      expect(result.stderr, startsWith(
-          'Failed to load "${p.relative(testPath, from: _sandbox)}": Top-level '
-              'main() function takes arguments.\n'));
-      expect(result.exitCode, equals(exit_codes.data));
+      expect(result.stdout, allOf([
+        contains('-1: load error'),
+        contains(
+            'Failed to load "${p.relative(testPath, from: _sandbox)}": '
+                'Top-level main() function takes arguments.\n')
+      ]));
+      expect(result.exitCode, equals(1));
     });
 
     // TODO(nweiz): test what happens when a test file is unreadable once issue
     // 15078 is fixed.
   });
 
   group("runs successful tests", () {
     test("on Chrome", () {
       new File(p.join(_sandbox, "test.dart")).writeAsStringSync(_success);
       var result = _runUnittest(["-p", "chrome", "test.dart"]);
@@ skipping 99 matching lines @@
 """);
 
     var result = _runUnittest(["-p", "chrome", "test.dart"]);
     expect(result.stdout, contains("Hello,\nworld!\n"));
     expect(result.exitCode, equals(0));
   });
 }
 
 ProcessResult _runUnittest(List<String> args) =>
     runUnittest(args, workingDirectory: _sandbox);