Issue 27820. Add fix for CompileTimeErrorCode.UNDEFINED_CLASS.

pkg/analysis_server/test/services/correction/fix_test.dart

Index: pkg/analysis_server/test/services/correction/fix_test.dart
diff --git a/pkg/analysis_server/test/services/correction/fix_test.dart b/pkg/analysis_server/test/services/correction/fix_test.dart
index 3923162b3fff672bcf104b2d9fd00f03609bc69f..4ddbb782ce610483fce798180c5cca6b28f51bb0 100644
--- a/pkg/analysis_server/test/services/correction/fix_test.dart
+++ b/pkg/analysis_server/test/services/correction/fix_test.dart
@@ -3171,6 +3171,31 @@ main() {
 ''');
   }
 
+  test_importLibraryProject_withClass_constInstanceCreation() async {
+    addSource(
+        '/lib.dart',
+        '''
+class Test {
+  const Test();
+}
+''');
+    resolveTestUnit('''
+main() {
+  const Test();
+}
+''');
+    performAllAnalysisTasks();
+    await assertHasFix(
+        DartFixKind.IMPORT_LIBRARY_PROJECT1,
+        '''
+import 'lib.dart';
+
+main() {
+  const Test();
+}
+''');
+  }
+
   test_importLibraryProject_withClass_hasOtherLibraryWithPrefix() async {
     testFile = '/project/bin/test.dart';
     addSource(