Issue 21549. Fix for infinite loop in the Angular expression parser.

editor/tools/plugins/com.google.dart.engine_test/src/com/google/dart/engine/internal/html/angular/AngularHtmlUnitResolverTest.java

 /*
  * Copyright (c) 2013, the Dart project authors.
  * 
  * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
  * in compliance with the License. You may obtain a copy of the License at
  * 
  * http://www.eclipse.org/legal/epl-v10.html
  * 
  * Unless required by applicable law or agreed to in writing, software distributed under the License
  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
@@ skipping 735 matching lines @@
     assertResolvedIdentifier("ctrl", "MyController");
   }
 
   public void test_resolveExpression_withFilter() throws Exception {
     addMyController();
     resolveIndexNoErrors(createHtmlWithMyController("{{ctrl.field | uppercase}}"));
     assertResolvedIdentifier("ctrl", "MyController");
     assertResolvedIdentifier("uppercase");
   }
 
+  public void test_resolveExpression_withFilter_missingColon() throws Exception {
+    addMyController();
+    resolveIndex(createHtmlWithMyController("{{ctrl.field | uppercase, lowercase}}"));
+    assertErrors(indexSource, AngularCode.MISSING_FORMATTER_COLON);
+  }
+
   public void test_resolveExpression_withFilter_notSimpleIdentifier() throws Exception {
     addMyController();
     resolveIndex(createHtmlWithMyController("{{ctrl.field | not.supported}}"));
     assertErrors(indexSource, AngularCode.INVALID_FORMATTER_NAME);
   }
 
   public void test_scopeProperties() throws Exception {
     addMainSource(createSource("",//
         "import 'angular.dart';",
         "",
@@ skipping 86 matching lines @@
   private String getSourceContent(Source source) throws Exception {
     return context.getContents(source).getData().toString();
   }
 
   private void resolveIndexNoErrors(String content) throws Exception {
     resolveIndex(content);
     assertNoErrors();
     verify(indexSource);
   }
 }