Modify tests to use Directory.systemTemp

tests/standalone/io/file_input_stream_test.dart

 // Copyright (c) 2013, 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.
 // Testing file input stream, VM-only, standalone test.
 
 import "dart:convert";
 import "dart:io";
 
 import "package:async_helper/async_helper.dart";
 import "package:expect/expect.dart";
@@ skipping 49 matching lines @@
   }
   file.writeAsStringSync(buffer.toString());
   var length = file.lengthSync();
   Expect.equals(buffer.length, length);
   return length;
 }
 
 
 void testInputStreamTruncate() {
   asyncStart();
-  var temp = new Directory('').createTempSync();
+  var temp = Directory.systemTemp.createTempSync('file_input_stream_test');
   var file = new File('${temp.path}/input_stream_truncate.txt');
   var originalLength = writeLongFileSync(file);
   // Start streaming the file. Pause after first chunk. Truncate
   // underlying file and check that the streaming stops with or
   // without getting all data.
   var streamedBytes = 0;
   var subscription;
   subscription = file.openRead().listen(
       (d) {
         if (streamedBytes == 0) {
@@ skipping 12 matching lines @@
         Expect.isTrue(streamedBytes > 0 && streamedBytes <= originalLength);
         temp.delete(recursive: true).then((_) => asyncEnd());
       },
       onError: (e) {
         Expect.fail("Unexpected error");
       });
 }
 
 void testInputStreamDelete() {
   asyncStart();
-  var temp = new Directory('').createTempSync();
+  var temp = Directory.systemTemp.createTempSync('file_input_stream_test');
   var file = new File('${temp.path}/input_stream_delete.txt');
   var originalLength = writeLongFileSync(file);
   // Start streaming the file. Pause after first chunk. Truncate
   // underlying file and check that the streaming stops with or
   // without getting all data.
   var streamedBytes = 0;
   var subscription;
   subscription = file.openRead().listen(
       (d) {
         if (streamedBytes == 0) {
@@ skipping 19 matching lines @@
         temp.delete(recursive: true).then((_) => asyncEnd());
       },
       onError: (e) {
         Expect.fail("Unexpected error");
       });
 }
 
 
 void testInputStreamAppend() {
   asyncStart();
-  var temp = new Directory('').createTempSync();
+  var temp = Directory.systemTemp.createTempSync('file_input_stream_test');
   var file = new File('${temp.path}/input_stream_append.txt');
   var originalLength = writeLongFileSync(file);
   // Start streaming the file. Pause after first chunk. Append to
   // underlying file and check that the stream gets all the data.
   var streamedBytes = 0;
   var subscription;
   subscription = file.openRead().listen(
       (d) {
         if (streamedBytes == 0) {
           subscription.pause();
@@ skipping 13 matching lines @@
       },
       onError: (e) {
         Expect.fail("Unexpected error");
       });
 }
 
 
 void testInputStreamOffset() {
   void test(int start, int end, int expectedBytes) {
     asyncStart();
-    var temp = new Directory('').createTempSync();
+    var temp = Directory.systemTemp.createTempSync('file_input_stream_test');
     var file = new File('${temp.path}/input_stream_offset.txt');
     var originalLength = writeLongFileSync(file);
     var streamedBytes = 0;
     if (expectedBytes < 0) expectedBytes = originalLength + expectedBytes;
     file.openRead(start, end).listen(
         (d) {
           streamedBytes += d.length;
         },
         onDone: () {
           Expect.equals(expectedBytes, streamedBytes);
@@ skipping 10 matching lines @@
   test(null, 0, 0);
   test(null, 1, 1);
   test(1, null, -1);
   test(20, null, -20);
 }
 
 
 void testInputStreamBadOffset() {
   void test(int start, int end) {
     asyncStart();
-    var temp = new Directory('').createTempSync();
+    var temp = Directory.systemTemp.createTempSync('file_input_stream_test');
     var file = new File('${temp.path}/input_stream_bad_offset.txt');
     var originalLength = writeLongFileSync(file);
     var streamedBytes = 0;
     file.openRead(start, end).listen(
         (d) {
           streamedBytes += d.length;
         },
         onDone: () {
           temp.delete(recursive: true);
         },
@@ skipping 37 matching lines @@
   testInputStreamDelete();
   testInputStreamAppend();
   testInputStreamOffset();
   testInputStreamBadOffset();
   // Check the length of these files as both are text files where one
   // is without a terminating line separator which can easily be added
   // back if accidentally opened in a text editor.
   testStringLineSplitterEnding("readline_test1.dat", 111);
   testStringLineSplitterEnding("readline_test2.dat", 114);
 }