Fix some type and logical errors in test.dart, found by the Dart editor.

tools/testing/dart/test_suite.dart

 // Copyright (c) 2012, 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.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
  *   and creating [TestCase]s for those files that meet the relevant criteria.
  * - Preparing tests, including copying files and frameworks to temporary
  *   directories, and computing the command line and arguments to be run.
  */
 #library("test_suite");
 
 #import("dart:io");
+#import("dart:builtin");
 #import("dart:isolate");
 #import("status_file_parser.dart");
 #import("test_runner.dart");
 #import("multitest.dart");
 
 #source("browser_test.dart");
 
 
 /**
  * A TestSuite represents a collection of tests.  It creates a [TestCase]
@@ skipping 747 matching lines @@
         const RegExp(@"^#import.*(dart:(dom|html)|html\.dart).*\)",
                      multiLine: true);
     RegExp libraryDefinitionRegExp =
         const RegExp(@"^#library\(", multiLine: true);
     RegExp sourceOrImportRegExp =
         const RegExp(@"^#(source|import|resource)\(", multiLine: true);
 
     // Read the entire file into a byte buffer and transform it to a
     // String. This will treat the file as ascii but the only parts
     // we are interested in will be ascii in any case.
-    RandomAccessFile file = new File(filename).openSync();
+    RandomAccessFile file = new File(filename).openSync(FileMode.READ);
     List chars = new List(file.lengthSync());
     var offset = 0;
     while (offset != chars.length) {
       offset += file.readListSync(chars, offset, chars.length - offset);
     }
     file.closeSync();
     String contents = new String.fromCharCodes(chars);
     chars = null;
 
     // Find the options in the file.
@@ skipping 420 matching lines @@
  * $noCrash tests are expected to be flaky but not crash
  * $pass tests are expected to pass
  * $failOk tests are expected to fail that we won't fix
  * $fail tests are expected to fail that we should fix
  * $crash tests are expected to crash that we should fix
  * $timeout tests are allowed to timeout
 """;
     print(report);
    }
 }