Modify tests to use Directory.systemTemp

tests/standalone/io/file_system_async_links_test.dart

Index: tests/standalone/io/file_system_async_links_test.dart
diff --git a/tests/standalone/io/file_system_async_links_test.dart b/tests/standalone/io/file_system_async_links_test.dart
index f958bfadbd061f5ce38c49179a7f7d5b92b5da63..579cdd0fcfb13ad02b638bdb5b0fe32b7634a18c 100644
--- a/tests/standalone/io/file_system_async_links_test.dart
+++ b/tests/standalone/io/file_system_async_links_test.dart
@@ -26,7 +26,7 @@ class FutureExpect {
 
 
 Future testFileExistsCreate() {
-  return new Directory('').createTemp().then((temp) {
+  return Directory.createSystemTemp('dart_file_system_async').then((temp) {
     var x = '${temp.path}${Platform.pathSeparator}x';
     var y = '${temp.path}${Platform.pathSeparator}y';
     return new Link(y).create(x)
@@ -98,7 +98,7 @@ Future testFileExistsCreate() {
 
 
 Future testFileDelete() {
-  return new Directory('').createTemp().then((temp) {
+  return Directory.createSystemTemp('dart_file_system_async').then((temp) {
     var x = '${temp.path}${Platform.pathSeparator}x';
     var y = '${temp.path}${Platform.pathSeparator}y';
     return new File(x).create()
@@ -120,7 +120,7 @@ Future testFileDelete() {
 
 
 Future testFileWriteRead() {
-  return new Directory('').createTemp().then((temp) {
+  return Directory.createSystemTemp('dart_file_system_async').then((temp) {
     var x = '${temp.path}${Platform.pathSeparator}x';
     var y = '${temp.path}${Platform.pathSeparator}y';
     var data = "asdf".codeUnits;
@@ -136,7 +136,7 @@ Future testFileWriteRead() {
 
 
 Future testDirectoryExistsCreate() {
-  return new Directory('').createTemp().then((temp) {
+  return Directory.createSystemTemp('dart_file_system_async').then((temp) {
     var x = '${temp.path}${Platform.pathSeparator}x';
     var y = '${temp.path}${Platform.pathSeparator}y';
     return new Link(y).create(x)
@@ -149,8 +149,8 @@ Future testDirectoryExistsCreate() {
 
 
 Future testDirectoryDelete() {
-  return new Directory('').createTemp().then((temp) =>
-  new Directory('').createTemp().then((temp2) {
+  return Directory.createSystemTemp('dart_file_system_async').then((temp) =>
+  Directory.createSystemTemp('dart_file_system_async').then((temp2) {
     var y = '${temp.path}${Platform.pathSeparator}y';
     var x = '${temp2.path}${Platform.pathSeparator}x';
     var link = new Directory(y);
@@ -174,8 +174,8 @@ Future testDirectoryDelete() {
 
 
 Future testDirectoryListing() {
-  return new Directory('').createTemp().then((temp) =>
-  new Directory('').createTemp().then((temp2) {
+  return Directory.createSystemTemp('dart_file_system_async').then((temp) =>
+  Directory.createSystemTemp('dart_file_system_async_links').then((temp2) {
     var sep = Platform.pathSeparator;
     var y = '${temp.path}${sep}y';
     var x = '${temp2.path}${sep}x';
@@ -194,7 +194,7 @@ Future testDirectoryListing() {
 
 
 Future testDirectoryListingBrokenLink() {
-  return new Directory('').createTemp().then((temp) {
+  return Directory.createSystemTemp('dart_file_system_async').then((temp) {
     var x = '${temp.path}${Platform.pathSeparator}x';
     var link = '${temp.path}${Platform.pathSeparator}link';
     var doesNotExist = 'this_thing_does_not_exist';