Guard against exceptions thrown by linters (issue 27545)

pkg/analyzer/test/generated/utilities_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.
 
 library analyzer.test.generated.utilities_test;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
+import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/src/dart/ast/token.dart';
 import 'package:analyzer/src/dart/ast/utilities.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
 import 'package:analyzer/src/dart/scanner/scanner.dart';
 import 'package:analyzer/src/generated/java_engine.dart';
 import 'package:analyzer/src/generated/parser.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/testing/ast_factory.dart';
 import 'package:analyzer/src/generated/testing/token_factory.dart';
 import 'package:analyzer/src/generated/utilities_collection.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'test_support.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(AstClonerTest);
-    defineReflectiveTests(NodeReplacerTest);
-    defineReflectiveTests(LineInfoTest);
-    defineReflectiveTests(SourceRangeTest);
     defineReflectiveTests(BooleanArrayTest);
     defineReflectiveTests(DirectedGraphTest);
+    defineReflectiveTests(ExceptionHandlingDelegatingAstVisitorTest);
+    defineReflectiveTests(LineInfoTest);
     defineReflectiveTests(MultipleMapIteratorTest);
+    defineReflectiveTests(NodeReplacerTest);
     defineReflectiveTests(SingleMapIteratorTest);
+    defineReflectiveTests(SourceRangeTest);
+    defineReflectiveTests(StringUtilitiesTest);
     defineReflectiveTests(TokenMapTest);
-    defineReflectiveTests(StringUtilitiesTest);
   });
 }
 
 class AstCloneComparator extends AstComparator {
   final bool expectTokensCopied;
 
   AstCloneComparator(this.expectTokensCopied);
 
   @override
   bool isEqualNodes(AstNode first, AstNode second) {
@@ skipping 1539 matching lines @@
     expect(topologicalSort[0], unorderedEquals([node3, node4]));
     expect(topologicalSort[1], unorderedEquals([node1, node2]));
   }
 }
 
 /**
  * Instances of the class `Node` represent simple nodes used for testing purposes.
  */
 class DirectedGraphTest_Node {}
 
+@reflectiveTest
+class ExceptionHandlingDelegatingAstVisitorTest extends EngineTestCase {
+  void test_handlerIsCalled() {
+    AstVisitor exceptionThrowingVisitor = new _ExceptionThrowingVisitor();
+    bool handlerInvoked = false;
+    AstVisitor visitor = new ExceptionHandlingDelegatingAstVisitor(
+        [exceptionThrowingVisitor], (AstNode node, AstVisitor visitor,
+            dynamic exception, StackTrace stackTrace) {
+      handlerInvoked = true;
+    });
+    new NullLiteral(null).accept(visitor);
+    expect(handlerInvoked, isTrue);
+  }
+}
+
 class Getter_NodeReplacerTest_test_annotation
     implements NodeReplacerTest_Getter<Annotation, ArgumentList> {
   @override
   ArgumentList get(Annotation node) => node.arguments;
 }
 
 class Getter_NodeReplacerTest_test_annotation_2
     implements NodeReplacerTest_Getter<Annotation, Identifier> {
   @override
   Identifier get(Annotation node) => node.name;
@@ skipping 2726 matching lines @@
   }
 
   void test_get_added() {
     TokenMap tokenMap = new TokenMap();
     Token key = TokenFactory.tokenFromType(TokenType.AT);
     Token value = TokenFactory.tokenFromType(TokenType.AT);
     tokenMap.put(key, value);
     expect(tokenMap.get(key), same(value));
   }
 }
+
+class _ExceptionThrowingVisitor extends SimpleAstVisitor {
+  visitNullLiteral(NullLiteral node) {
+    throw new ArgumentError('');
+  }
+}