Fix file tests.

tests/standalone/src/FileTest.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.
 //
 // Dart test program for testing file I/O.
 
 #import("dart:io");
 
 class MyListOfOneElement implements List {
   int _value;
@@ skipping 897 matching lines @@
     var port = new ReceivePort.singleShot();
     port.receive((result, replyTo) {
       Expect.equals(1, result);
     });
     var name = getFilename("tests/vm/data/fixed_length_file");
     var f = new File(name);
     f.readAsText('UTF-8');
     f.readAsTextHandler = (text) {
       Expect.isTrue(text.endsWith("42 bytes."));
       Expect.equals(42, text.length);
-      var name = getFilename("tests/standalone/src/read_as_text.dat");
+      var name = getDataFilename("tests/standalone/src/read_as_text.dat");
       var f = new File(name);
       f.errorHandler = (e) => Expect.fail("No errors expected");
       f.readAsText('UTF-8');
       f.readAsTextHandler = (text) {
         Expect.equals(6, text.length);
         var expected = [955, 120, 46, 32, 120, 10];
         Expect.listEquals(expected, text.charCodes());
         f.readAsText('ISO-8859-1');
         f.readAsTextHandler = (text) {
           Expect.equals(7, text.length);
@@ skipping 12 matching lines @@
     f.errorHandler = (e) {
       Expect.fail("No errors expected: $e");
     };
   }
 
   static void testReadAsTextSync() {
     var name = getFilename("tests/vm/data/fixed_length_file");
     var text = new File(name).readAsTextSync();
     Expect.isTrue(text.endsWith("42 bytes."));
     Expect.equals(42, text.length);
-    name = getFilename("tests/standalone/src/read_as_text.dat");
+    name = getDataFilename("tests/standalone/src/read_as_text.dat");
     text = new File(name).readAsTextSync();
     Expect.equals(6, text.length);
     var expected = [955, 120, 46, 32, 120, 10];
     Expect.listEquals(expected, text.charCodes());
     Expect.throws(() { new File(name).readAsTextSync("ASCII"); });
     text = new File(name).readAsTextSync("ISO-8859-1");
     expected = [206, 187, 120, 46, 32, 120, 10];
     Expect.equals(7, text.length);
     Expect.listEquals(expected, text.charCodes());
   }
@@ skipping 17 matching lines @@
     };
   }
 
   static void testReadAsLinesSync() {
     var name = getFilename("tests/vm/data/fixed_length_file");
     var lines = new File(name).readAsLinesSync();
     Expect.equals(1, lines.length);
     var line = lines[0];
     Expect.isTrue(line.endsWith("42 bytes."));
     Expect.equals(42, line.length);
-    name = getFilename("tests/standalone/src/readline_test1.dat");
+    name = getDataFilename("tests/standalone/src/readline_test1.dat");
     lines = new File(name).readAsLinesSync();
     Expect.equals(10, lines.length);
   }
 
   static void testReadAsErrors() {
     var f = new File('.');
     Expect.throws(f.readAsBytesSync, (e) => e is FileIOException);
     Expect.throws(f.readAsTextSync, (e) => e is FileIOException);
     Expect.throws(f.readAsLinesSync, (e) => e is FileIOException);
     // TODO(ager): Add tests of errors in readAsBytes when input
@@ skipping 57 matching lines @@
     openedFile.closeSync();
     file.deleteSync();
     Expect.isFalse(file.existsSync());
   }
 
   // Helper method to be able to run the test from the runtime
   // directory, or the top directory.
   static String getFilename(String path) =>
       new File(path).existsSync() ? path : 'runtime/' + path;
 
+  static String getDataFilename(String path) =>
+      new File(path).existsSync() ? path : '../' + path;
+
   // Main test entrypoint.
   static testMain() {
     testRead();
     testReadSync();
     testReadStream();
     testLength();
     testLengthSync();
     testPosition();
     testPositionSync();
     testMixedSyncAndAsync();
@@ skipping 25 matching lines @@
       testWriteVariousLists();
       testDirectory();
       testDirectorySync();
     });
   }
 }
 
 main() {
   FileTest.testMain();
 }