Issue 26051. Fix for MethodDeclartion.beginToken for external.

pkg/analyzer/test/dart/ast/ast_test.dart

Index: pkg/analyzer/test/dart/ast/ast_test.dart
diff --git a/pkg/analyzer/test/dart/ast/ast_test.dart b/pkg/analyzer/test/dart/ast/ast_test.dart
index 7be2b72e87bd3aef56ec31b51abac2fa3f827b07..6cd446dba5f2efa6f466bee4cd6360509b5368f6 100644
--- a/pkg/analyzer/test/dart/ast/ast_test.dart
+++ b/pkg/analyzer/test/dart/ast/ast_test.dart
@@ -23,6 +23,7 @@ main() {
   runReflectiveTests(ConstructorDeclarationTest);
   runReflectiveTests(FieldFormalParameterTest);
   runReflectiveTests(IndexExpressionTest);
+  runReflectiveTests(MethodDeclarationTest);
   runReflectiveTests(NodeListTest);
   runReflectiveTests(SimpleIdentifierTest);
   runReflectiveTests(SimpleStringLiteralTest);
@@ -305,6 +306,44 @@ class IndexExpressionTest extends EngineTestCase {
 }
 
 @reflectiveTest
+class MethodDeclarationTest extends EngineTestCase {
+  void test_firstTokenAfterCommentAndMetadata_external() {
+    MethodDeclaration declaration =
+        AstFactory.methodDeclaration4(external: true, name: 'm');
+    expect(declaration.firstTokenAfterCommentAndMetadata,
+        declaration.externalKeyword);
+  }
+
+  void test_firstTokenAfterCommentAndMetadata_external_getter() {
+    MethodDeclaration declaration = AstFactory.methodDeclaration4(
+        external: true, property: Keyword.GET, name: 'm');
+    expect(declaration.firstTokenAfterCommentAndMetadata,
+        declaration.externalKeyword);
+  }
+
+  void test_firstTokenAfterCommentAndMetadata_external_operator() {
+    MethodDeclaration declaration = AstFactory.methodDeclaration4(
+        external: true, operator: true, name: 'm');
+    expect(declaration.firstTokenAfterCommentAndMetadata,
+        declaration.externalKeyword);
+  }
+
+  void test_firstTokenAfterCommentAndMetadata_getter() {
+    MethodDeclaration declaration =
+        AstFactory.methodDeclaration4(property: Keyword.GET, name: 'm');
+    expect(declaration.firstTokenAfterCommentAndMetadata,
+        declaration.propertyKeyword);
+  }
+
+  void test_firstTokenAfterCommentAndMetadata_operator() {
+    MethodDeclaration declaration =
+        AstFactory.methodDeclaration4(operator: true, name: 'm');
+    expect(declaration.firstTokenAfterCommentAndMetadata,
+        declaration.operatorKeyword);
+  }
+}
+
+@reflectiveTest
 class NodeListTest extends EngineTestCase {
   void test_add() {
     AstNode parent = AstFactory.argumentList();