Add UNDEFINED_HIDDEN_NAME, UNDEFINED_SHOWN_NAME

pkg/analyzer/test/generated/hint_code_test.dart

Index: pkg/analyzer/test/generated/hint_code_test.dart
diff --git a/pkg/analyzer/test/generated/hint_code_test.dart b/pkg/analyzer/test/generated/hint_code_test.dart
index 168c471b77b27e84b097f4c42aa36ab252430c12..d8fa536a18a24328b831358ed52c7c4893bfeca6 100644
--- a/pkg/analyzer/test/generated/hint_code_test.dart
+++ b/pkg/analyzer/test/generated/hint_code_test.dart
@@ -1710,6 +1710,26 @@ m(i) {
     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 {}