Guard against exceptions thrown by linters (issue 27545)

pkg/analyzer/test/generated/utilities_test.dart

Index: pkg/analyzer/test/generated/utilities_test.dart
diff --git a/pkg/analyzer/test/generated/utilities_test.dart b/pkg/analyzer/test/generated/utilities_test.dart
index 421949e282ae2b61a50bb2874ec083442b2e7e93..2c57df9fde21a01dbc24a47897b4ee29e69ff186 100644
--- a/pkg/analyzer/test/generated/utilities_test.dart
+++ b/pkg/analyzer/test/generated/utilities_test.dart
@@ -8,6 +8,7 @@ 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';
@@ -26,15 +27,16 @@ 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(TokenMapTest);
+    defineReflectiveTests(SourceRangeTest);
     defineReflectiveTests(StringUtilitiesTest);
+    defineReflectiveTests(TokenMapTest);
   });
 }
 
@@ -1594,6 +1596,21 @@ class DirectedGraphTest extends EngineTestCase {
  */
 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
@@ -4340,3 +4357,9 @@ class TokenMapTest {
     expect(tokenMap.get(key), same(value));
   }
 }
+
+class _ExceptionThrowingVisitor extends SimpleAstVisitor {
+  visitNullLiteral(NullLiteral node) {
+    throw new ArgumentError('');
+  }
+}