Fix directory existence query error

tests/standalone/io/directory_test.dart

Index: tests/standalone/io/directory_test.dart
diff --git a/tests/standalone/io/directory_test.dart b/tests/standalone/io/directory_test.dart
index 14685b105db00a29ecf491ec09132ea8b98b3b58..990d98266b224f01032367b64dab9d03ac477593 100644
--- a/tests/standalone/io/directory_test.dart
+++ b/tests/standalone/io/directory_test.dart
@@ -603,14 +603,24 @@ testRename() {
   Expect.isTrue(temp2.existsSync());
   Expect.equals(temp3.path, temp2.path);
 
-  temp2.rename(temp1.path).then((temp4) {
-    Expect.isFalse(temp3.existsSync());
-    Expect.isFalse(temp2.existsSync());
-    Expect.isTrue(temp1.existsSync());
-    Expect.isTrue(temp4.existsSync());
-    Expect.equals(temp1.path, temp4.path);
-    temp1.deleteSync(recursive: true);
-  });
+  var temp4 = temp2.renameSync(temp1.path);
+  Expect.isFalse(temp3.existsSync());
+  Expect.isFalse(temp2.existsSync());
+  Expect.isTrue(temp1.existsSync());
+  Expect.isTrue(temp4.existsSync());
+  Expect.equals(temp1.path, temp4.path);
+  temp1.deleteSync(recursive: true);
+
+  var file = new File('${temp4.path}/foo');
+  try {
+    new Directory('${temp4.path}/foo').renameSync('${temp4.path}/bar');
+    Expect.fail('Directory.rename should fail to rename a non-directory');
+  } catch (e) {
+    Expect.isTrue(e is FileSystemException);
+    if (Platform.isLinux || Platform.isMacOS) {
+      Expect.isTrue(e.osError.message.contains('No such file or directory'));
+    }
+  }
 }
 
 main() {