Issue 24440. Fix for renaming libraries using 'part of' directives.

pkg/analyzer/test/generated/all_the_rest_test.dart

Index: pkg/analyzer/test/generated/all_the_rest_test.dart
diff --git a/pkg/analyzer/test/generated/all_the_rest_test.dart b/pkg/analyzer/test/generated/all_the_rest_test.dart
index e3edac3af9fc41d6614703f8a3f64065a46acfac..d64495a5acbb3b70005216929e4509dce283b361 100644
--- a/pkg/analyzer/test/generated/all_the_rest_test.dart
+++ b/pkg/analyzer/test/generated/all_the_rest_test.dart
@@ -6968,6 +6968,26 @@ void main() {
         (obj) => obj is FunctionElement, FunctionElement, element);
   }
 
+  void test_locate_PartOfDirective() {
+    Source librarySource = addNamedSource(
+        '/lib.dart',
+        '''
+library my.lib;
+part 'part.dart';
+''');
+    Source unitSource = addNamedSource(
+        '/part.dart',
+        '''
+part of my.lib;
+''');
+    CompilationUnit unit =
+        analysisContext.resolveCompilationUnit2(unitSource, librarySource);
+    PartOfDirective partOf = unit.directives.first;
+    Element element = ElementLocator.locate(partOf);
+    EngineTestCase.assertInstanceOf(
+        (obj) => obj is LibraryElement, LibraryElement, element);
+  }
+
   void test_locate_PostfixExpression() {
     AstNode id = _findNodeIn("++", "int addOne(int x) => x++;");
     Element element = ElementLocator.locate(id);