Flush InterfaceTypeImpl cached memebers when ClassElement.version is different.

pkg/analyzer/test/src/dart/element/element_test.dart

 // Copyright (c) 2014, 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 analyzer.test.src.dart.element.element_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/constant/value.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 2764 matching lines @@
     typeAI.typeArguments = <DartType>[typeI];
     MethodElement method = typeAI.getMethod(methodName);
     expect(method, isNotNull);
     FunctionType methodType = method.type;
     expect(methodType.returnType, same(typeI));
     List<DartType> parameterTypes = methodType.normalParameterTypes;
     expect(parameterTypes, hasLength(1));
     expect(parameterTypes[0], same(typeI));
   }
 
+  void test_getMethod_parameterized_flushCached_whenVersionChanges() {
+    //
+    // class A<E> { E m(E p) {} }
+    //
+    ClassElementImpl classA = ElementFactory.classElement2("A", ["E"]);
+    DartType typeE = classA.type.typeArguments[0];
+    String methodName = "m";
+    MethodElementImpl methodM =
+        ElementFactory.methodElement(methodName, typeE, [typeE]);
+    classA.methods = <MethodElement>[methodM];
+    methodM.type = new FunctionTypeImpl(methodM);
+    //
+    // A<I>
+    //
+    InterfaceType typeI = ElementFactory.classElement2("I").type;
+    InterfaceTypeImpl typeAI = new InterfaceTypeImpl(classA);
+    typeAI.typeArguments = <DartType>[typeI];
+    // Methods list is cached.
+    MethodElement method = typeAI.methods.single;
+    expect(typeAI.methods.single, same(method));
+    // Methods list is flushed on version change.
+    classA.version++;
+    expect(typeAI.methods.single, isNot(same(method)));
+  }
+
   void test_getMethod_unimplemented() {
     //
     // class A {}
     //
     ClassElementImpl classA = ElementFactory.classElement2("A");
     InterfaceType typeA = classA.type;
     expect(typeA.getMethod("m"), isNull);
   }
 
   void test_getMethods() {
@@ skipping 1667 matching lines @@
 }
 
 class _FunctionTypeImplTest_isSubtypeOf_baseCase_classFunction
     extends InterfaceTypeImpl {
   _FunctionTypeImplTest_isSubtypeOf_baseCase_classFunction(ClassElement arg0)
       : super(arg0);
 
   @override
   bool get isDartCoreFunction => true;
 }