Fix typo in test, add check of error thrown.

tests/corelib/uri_file_test.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.
 
 import "package:expect/expect.dart";
 
 testFileUri() {
   final unsupported = new UnsupportedError("");
 
   var tests = [
@@ skipping 206 matching lines @@
     Expect.throws(() => new Uri.directory(test, windows: true),
                   (e) => e is ArgumentError);
     Expect.throws(() => new Uri.directory("\\$test", windows: true),
                   (e) => e is ArgumentError);
 
     // It is possible to create non-Windows URIs, but not Windows URIs.
     Uri uri = new Uri.file(test, windows: false);
     Uri absoluteUri = new Uri.file("/$test", windows: false);
     Uri dirUri = new Uri.directory(test, windows: false);
     Uri dirAbsoluteUri = new Uri.directory("/$test", windows: false);
-    Expect.throws(() => new Uri.file(test, windows: true));
-    Expect.throws(() => new Uri.file("\\$test", windows: true));
-    Expect.throws(() => new Uri.direcory(test, windows: true));
-    Expect.throws(() => new Uri.directory("\\$test", windows: true));
+    Expect.throws(() => new Uri.file(test, windows: true),
+                  (e) => e is ArgumentError);
+    Expect.throws(() => new Uri.file("\\$test", windows: true),
+                  (e) => e is ArgumentError);
+    Expect.throws(() => new Uri.directory(test, windows: true),
+                  (e) => e is ArgumentError);
+    Expect.throws(() => new Uri.directory("\\$test", windows: true),
+                  (e) => e is ArgumentError);
 
     // It is possible to extract non-Windows file path, but not
     // Windows file path.
     Expect.equals(test, uri.toFilePath(windows: false));
     Expect.equals("/$test", absoluteUri.toFilePath(windows: false));
     Expect.equals("$test/", dirUri.toFilePath(windows: false));
     Expect.equals("/$test/", dirAbsoluteUri.toFilePath(windows: false));
-    Expect.throws(() => uri.toFilePath(windows: true));
-    Expect.throws(() => absoluteUri.toFilePath(windows: true));
-    Expect.throws(() => dirUri.toFilePath(windows: true));
-    Expect.throws(() => dirAbsoluteUri.toFilePath(windows: true));
+    Expect.throws(() => uri.toFilePath(windows: true),
+                  (e) => e is UnsupportedError);
+    Expect.throws(() => absoluteUri.toFilePath(windows: true),
+                  (e) => e is UnsupportedError);
+    Expect.throws(() => dirUri.toFilePath(windows: true),
+                  (e) => e is UnsupportedError);
+    Expect.throws(() => dirAbsoluteUri.toFilePath(windows: true),
+                  (e) => e is UnsupportedError);
   }
 
   // Backslash
   illegalWindowsPaths = ["a\\b", "a\\b\\"];
   for (var test in illegalWindowsPaths) {
     // It is possible to create both non-Windows URIs, and Windows URIs.
     Uri uri = new Uri.file(test, windows: false);
     Uri absoluteUri = new Uri.file("/$test", windows: false);
     Uri dirUri = new Uri.directory(test, windows: false);
     Uri dirAbsoluteUri = new Uri.directory("/$test", windows: false);
     new Uri.file(test, windows: true);
     new Uri.file("\\$test", windows: true);
 
     // It is possible to extract non-Windows file path, but not
     // Windows file path from the non-Windows URI (it has a backslash
     // in a path segment).
     Expect.equals(test, uri.toFilePath(windows: false));
     Expect.equals("/$test", absoluteUri.toFilePath(windows: false));
     Expect.equals("$test/", dirUri.toFilePath(windows: false));
     Expect.equals("/$test/", dirAbsoluteUri.toFilePath(windows: false));
     Expect.throws(() => uri.toFilePath(windows: true),
                   (e) => e is UnsupportedError);
-    Expect.throws(() => absoluteUri.toFilePath(windows: true));
+    Expect.throws(() => absoluteUri.toFilePath(windows: true),
+                  (e) => e is UnsupportedError);
     Expect.throws(() => dirUri.toFilePath(windows: true),
                   (e) => e is UnsupportedError);
-    Expect.throws(() => dirAbsoluteUri.toFilePath(windows: true));
+    Expect.throws(() => dirAbsoluteUri.toFilePath(windows: true),
+                  (e) => e is UnsupportedError);
   }
 }
 
 testFileUriIllegalDriveLetter() {
   Expect.throws(() => new Uri.file("1:\\", windows: true),
                 (e) => e is ArgumentError);
   Expect.throws(() => new Uri.directory("1:\\", windows: true),
                 (e) => e is ArgumentError);
   Uri uri = new Uri.file("1:\\", windows: false);
   Uri dirUri = new Uri.directory("1:\\", windows: false);
@@ skipping 28 matching lines @@
 main() {
   testFileUri();
   testFileUriWindowsSlash();
   testFileUriDriveLetter();
   testFileUriWindowsWin32Namespace();
   testFileUriResolve();
   testFileUriIllegalCharacters();
   testFileUriIllegalDriveLetter();
   testAdditionalComponents();
 }