Option support for `enableGenericMethods`.

pkg/analyzer/test/src/task/options_test.dart

 // Copyright (c) 2015, 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 test.src.task.options_test;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/source/analysis_options_provider.dart';
 import 'package:analyzer/src/generated/engine.dart' hide AnalysisContextImpl;
 import 'package:analyzer/src/generated/source.dart';
@@ skipping 23 matching lines @@
   final AnalysisOptionsProvider optionsProvider = new AnalysisOptionsProvider();
 
   AnalysisOptions get analysisOptions => context.analysisOptions;
 
   configureContext(String optionsSource) =>
       configureContextOptions(context, parseOptions(optionsSource));
 
   Map<String, YamlNode> parseOptions(String source) =>
       optionsProvider.getOptionsFromString(source);
 
+  test_configure_enableGenericMethods() {
+    expect(analysisOptions.enableGenericMethods, false);
+    configureContext('''
+analyzer:
+  language:
+    enableGenericMethods: true
+''');
+    expect(analysisOptions.enableGenericMethods, true);
+  }
+
   test_configure_enableSuperMixins() {
     configureContext('''
 analyzer:
   language:
     enableSuperMixins: true
 ''');
     expect(analysisOptions.enableSuperMixins, true);
   }
 
   test_configure_error_filters() {
@@ skipping 184 matching lines @@
         []);
   }
 
   test_analyzer_language_unsupported_key() {
     validate(
         '''
 analyzer:
   language:
     unsupported: true
 ''',
-        [AnalysisOptionsWarningCode.UNSUPPORTED_OPTION_WITH_LEGAL_VALUE]);
+        [AnalysisOptionsWarningCode.UNSUPPORTED_OPTION_WITH_LEGAL_VALUES]);
   }
 
   test_analyzer_language_unsupported_value() {
     validate(
         '''
 analyzer:
   language:
     enableSuperMixins: foo
 ''',
         [AnalysisOptionsWarningCode.UNSUPPORTED_VALUE]);
@@ skipping 46 matching lines @@
         [AnalysisOptionsWarningCode.UNSUPPORTED_OPTION_WITH_LEGAL_VALUE]);
   }
 
   void validate(String source, List<AnalysisOptionsErrorCode> expected) {
     var options = optionsProvider.getOptionsFromString(source);
     var errors = validator.validate(options);
     expect(errors.map((AnalysisError e) => e.errorCode),
         unorderedEquals(expected));
   }
 }