Fix test to not depend on analyzer error message.

test/formatter_test.dart

 // Copyright (c) 2014, 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.
 
 @TestOn("vm")
 library dart_style.test.formatter_test;
 
 import 'dart:io';
 import 'dart:mirrors';
 
@@ skipping 63 matching lines @@
   test("does not add newline to statement", () {
     expect(new DartFormatter().formatStatement("var x = 1;"),
         equals("var x = 1;"));
   });
 
   test("fails if anything is after the statement", () {
     try {
       new DartFormatter().formatStatement("var x = 1;;");
 
       fail("Should throw.");
-    } catch (err) {
-      expect(err, new isInstanceOf<FormatterException>());
-      var message = err.message();
-      expect(message, contains("Unexpected token"));
-      expect(message, contains("column 11"));
+    } on FormatterException catch (ex) {
+      expect(ex.errors.length, equals(1));
+      expect(ex.errors.first.offset, equals(10));
     }
   });
 
   test('preserves initial indent', () {
     var formatter = new DartFormatter(indent: 3);
     expect(
         formatter.formatStatement('if (foo) {bar;}'),
         equals('   if (foo) {\n'
             '     bar;\n'
             '   }'));
@@ skipping 132 matching lines @@
   source = source.replaceAll("‹", "");
 
   var end = source.indexOf("›");
   source = source.replaceAll("›", "");
 
   return new SourceCode(source,
       isCompilationUnit: isCompilationUnit,
       selectionStart: start == -1 ? null : start,
       selectionLength: end == -1 ? null : end - start);
 }