Gracefully handle IO exceptions while resolving URIs (issue 23023)

pkg/analyzer/test/generated/engine_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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.engine_test;
 
 import 'dart:async';
@@ skipping 4521 matching lines @@
     visited = true;
     return null;
   }
 }
 
 class LintGeneratorTest_Linter_Null_Visitor extends Linter {
   @override
   AstVisitor getVisitor() => null;
 }
 
+class MockSourceFactory extends SourceFactory {
+  MockSourceFactory() : super([]);
+  Source resolveUri(Source containingSource, String containedUri) {
+    throw new JavaIOException();
+  }
+}
+
 @reflectiveTest
 class ParseDartTaskTest extends EngineTestCase {
   void test_accept() {
     ParseDartTask task = new ParseDartTask(null, null, null, null);
     expect(task.accept(new ParseDartTaskTestTV_accept()), isTrue);
   }
 
   void test_getCompilationUnit() {
     ParseDartTask task = new ParseDartTask(null, null, null, null);
     expect(task.compilationUnit, isNull);
@@ skipping 68 matching lines @@
 part 'part.dart';
 class A {}''';
     Source source = new TestSource('/test.dart', content);
     InternalAnalysisContext context = new AnalysisContextImpl();
     context.sourceFactory = new SourceFactory([new FileUriResolver()]);
     ParseDartTask task = _createParseTask(context, source, content);
     task.perform(
         new ParseDartTaskTestTV_perform_validateDirectives(context, source));
   }
 
+  void test_resolveDirective_dartUri() {
+    GatheringErrorListener listener = new GatheringErrorListener();
+    ImportDirective directive = AstFactory.importDirective3('dart:core', null);
+    AnalysisContext context = AnalysisContextFactory.contextWithCore();
+    Source source =
+        ParseDartTask.resolveDirective(context, null, directive, listener);
+    expect(source, isNotNull);
+  }
+
+  void test_resolveDirective_exception() {
+    GatheringErrorListener listener = new GatheringErrorListener();
+    ImportDirective directive = AstFactory.importDirective3('dart:core', null);
+    AnalysisContext context = new AnalysisContextImpl();
+    context.sourceFactory = new MockSourceFactory();
+    Source source =
+        ParseDartTask.resolveDirective(context, null, directive, listener);
+    expect(source, isNull);
+    expect(listener.errors.length, 1);

[scheglov, 2015/03/27 23:05:58]

expect(listener.errors, hasLength(1));

[Brian Wilkerson, 2015/03/27 23:51:57]

Done

+  }
+
   /**
    * Create and return a task that will parse the given content from the given source in the given
    * context.
    *
    * @param context the context to be passed to the task
    * @param source the source to be parsed
    * @param content the content of the source to be parsed
    * @return the task that was created
    * @throws AnalysisException if the task could not be created
    */
@@ skipping 1936 matching lines @@
   @override
   bool exists() => true;
 }
 
 class _UniversalCachePartitionTest_test_setMaxCacheSize
     implements CacheRetentionPolicy {
   @override
   RetentionPriority getAstPriority(Source source, SourceEntry sourceEntry) =>
       RetentionPriority.LOW;
 }