Fix broken test

tests/standalone/src/DirectoryTest.dart

Index: tests/standalone/src/DirectoryTest.dart
diff --git a/tests/standalone/src/DirectoryTest.dart b/tests/standalone/src/DirectoryTest.dart
index 0db2dccd5a45f4b0d0eca064a4040517409443ef..9ebe922064d3180a1f568c2a3130c8ea3e0c9f3a 100644
--- a/tests/standalone/src/DirectoryTest.dart
+++ b/tests/standalone/src/DirectoryTest.dart
@@ -264,7 +264,13 @@ String illegalTempDirectoryLocation() {
 testCreateTempErrorSync() {
   var location = illegalTempDirectoryLocation();
   if (location != null) {
-    Expect.throws(new Directory(location).createTempSync());
+    bool exception = false;
+    try {
+      new Directory(location).createTempSync();
+    } catch(DirectoryException e) {
+      exception = true;
+    }
+    Expect.isTrue(exception);
   }
 }