Add UNDEFINED_HIDDEN_NAME, UNDEFINED_SHOWN_NAME

pkg/analyzer/test/generated/hint_code_test.dart

 // Copyright (c) 2016, 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.generated.hint_code_test;
 
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/source_io.dart';
 import 'package:unittest/unittest.dart';
@@ skipping 1692 matching lines @@
   void test_typeCheck_type_not_Null() {
     Source source = addSource(r'''
 m(i) {
   bool b = i is! Null;
 }''');
     computeLibrarySourceErrors(source);
     assertErrors(source, [HintCode.TYPE_CHECK_IS_NOT_NULL]);
     verify([source]);
   }
 
+  void test_undefinedIdentifier_hide() {
+    Source source = addSource(r'''
+library L;
+export 'lib1.dart' hide a;''');
+    addNamedSource("/lib1.dart", "library lib1;");
+    computeLibrarySourceErrors(source);
+    assertErrors(source, [HintCode.UNDEFINED_HIDDEN_NAME]);
+    verify([source]);
+  }
+
+  void test_undefinedIdentifier_show() {
+    Source source = addSource(r'''
+library L;
+export 'lib1.dart' show a;''');
+    addNamedSource("/lib1.dart", "library lib1;");
+    computeLibrarySourceErrors(source);
+    assertErrors(source, [HintCode.UNDEFINED_SHOWN_NAME]);
+    verify([source]);
+  }
+
   void test_undefinedGetter() {
     Source source = addSource(r'''
 class A {}
 f(var a) {
   if(a is A) {
     return a.m;
   }
 }''');
     computeLibrarySourceErrors(source);
     assertErrors(source, [HintCode.UNDEFINED_GETTER]);
@@ skipping 1517 matching lines @@
   n() {
     var a = m(), b = m();
   }
 }''');
     computeLibrarySourceErrors(source);
     assertErrors(
         source, [HintCode.USE_OF_VOID_RESULT, HintCode.USE_OF_VOID_RESULT]);
     verify([source]);
   }
 }