Option support for `enableGenericMethods`.

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

Index: pkg/analyzer/test/src/task/options_test.dart
diff --git a/pkg/analyzer/test/src/task/options_test.dart b/pkg/analyzer/test/src/task/options_test.dart
index 3b39f0baf4dbb55f6eb0fa038aeffab2117eb05e..5185e9b68eb98d3bf03bf300c74b8c1bd25b5e3d 100644
--- a/pkg/analyzer/test/src/task/options_test.dart
+++ b/pkg/analyzer/test/src/task/options_test.dart
@@ -41,6 +41,16 @@ class ContextConfigurationTest extends AbstractContextTest {
   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:
@@ -245,7 +255,7 @@ analyzer:
   language:
     unsupported: true
 ''',
-        [AnalysisOptionsWarningCode.UNSUPPORTED_OPTION_WITH_LEGAL_VALUE]);
+        [AnalysisOptionsWarningCode.UNSUPPORTED_OPTION_WITH_LEGAL_VALUES]);
   }
 
   test_analyzer_language_unsupported_value() {