add support for native methods in class

pkg/analyzer/test/generated/parser_fasta_test.dart

 // Copyright (c) 2017, 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.
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart' as analyzer;
 import 'package:analyzer/dart/ast/token.dart' show TokenType;
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/error/listener.dart' show ErrorReporter;
 import 'package:analyzer/src/dart/scanner/scanner.dart';
@@ skipping 44 matching lines @@
 
 @reflectiveTest
 class ClassMemberParserTest_Fasta extends FastaParserTestCase
     with ClassMemberParserTestMixin {
   @override
   @failingTest
   void test_parseConstructor_assert() {
     // TODO(paulberry): Fasta doesn't support asserts in initializers
     super.test_parseConstructor_assert();
   }
+
+  void test_parseClassMember_method_native_allowed() {
+    allowNativeClause = true;
+    test_parseClassMember_method_native();
+  }
+
+  void test_parseClassMember_method_native_not_allowed() {
+    allowNativeClause = false;
+    test_parseClassMember_method_native();
+  }
+
+  void test_parseClassMember_method_native_missing_literal() {
+    createParser('m() native;');
+    var method = parser.parseClassMember('C') as MethodDeclaration;
+    if (!allowNativeClause) {
+      assertErrorsWithCodes([
+        ParserErrorCode.NATIVE_CLAUSE_SHOULD_BE_ANNOTATION,
+      ]);
+    } else {
+      assertNoErrors();
+    }
+
+    var body = method.body as NativeFunctionBody;
+    expect(body.nativeKeyword, isNotNull);
+    expect(body.stringLiteral, isNull);
+    expect(body.semicolon, isNotNull);
+  }
+
+  void test_parseClassMember_method_native_missing_literal_allowed() {
+    allowNativeClause = true;
+    test_parseClassMember_method_native_missing_literal();
+  }
+
+  void test_parseClassMember_method_native_missing_literal_not_allowed() {
+    allowNativeClause = false;
+    test_parseClassMember_method_native_missing_literal();
+  }
 }
 
 /**
  * Tests of the fasta parser based on [ComplexParserTestMixin].
  */
 @reflectiveTest
 class ComplexParserTest_Fasta extends FastaParserTestCase
     with ComplexParserTestMixin {
   @override
   @failingTest
@@ skipping 2951 matching lines @@
     assertNoErrors();
   }
 
   @failingTest
   void test_parseCompilationUnitMember_abstractAsPrefix2() {
     // TODO(danrubel): should not be generating an error
     super.test_parseCompilationUnitMember_abstractAsPrefix();
     assertNoErrors();
   }
 }