Issue 26051. Fix for MethodDeclartion.beginToken for external.

pkg/analyzer/lib/src/generated/testing/ast_factory.dart

Index: pkg/analyzer/lib/src/generated/testing/ast_factory.dart
diff --git a/pkg/analyzer/lib/src/generated/testing/ast_factory.dart b/pkg/analyzer/lib/src/generated/testing/ast_factory.dart
index d8d44f4d0dc5a6a4db3b6fe89bb9b11e788523ef..6983cc80ab7ceb808558b8e42a548ab7a41285a2 100644
--- a/pkg/analyzer/lib/src/generated/testing/ast_factory.dart
+++ b/pkg/analyzer/lib/src/generated/testing/ast_factory.dart
@@ -869,6 +869,28 @@ class AstFactory {
           parameters,
           body);
 
+  static MethodDeclaration methodDeclaration4(
+          {bool external: false,
+          Keyword modifier,
+          TypeName returnType,
+          Keyword property,
+          bool operator: false,
+          String name,
+          FormalParameterList parameters,
+          FunctionBody body}) =>
+      new MethodDeclaration(
+          null,
+          null,
+          external ? TokenFactory.tokenFromKeyword(Keyword.EXTERNAL) : null,
+          modifier == null ? null : TokenFactory.tokenFromKeyword(modifier),
+          returnType,
+          property == null ? null : TokenFactory.tokenFromKeyword(property),
+          operator ? TokenFactory.tokenFromKeyword(Keyword.OPERATOR) : null,
+          identifier3(name),
+          null,
+          parameters,
+          body);
+
   static MethodInvocation methodInvocation(Expression target, String methodName,
           [List<Expression> arguments,
           TokenType operator = TokenType.PERIOD]) =>