cd submodule_update &&
                        git -C sub1 checkout -b keep_branch &&
                        git -C sub1 rev-parse HEAD >expect &&
-                       git branch -t check-keep origin/modify_sub1 &&
-                       $command check-keep &&
+                       git branch -t modify_sub1 origin/modify_sub1 &&
+                       $command modify_sub1 &&
                        test_superproject_content origin/modify_sub1 &&
                        test_submodule_content sub1 origin/modify_sub1 &&
                        git -C sub1 rev-parse keep_branch >actual &&
                (
                        cd submodule_update &&
                        git branch -t replace_sub1_with_file origin/replace_sub1_with_file &&
+                       echo ignored >.git/modules/sub1/info/exclude &&
                        : >sub1/ignored &&
                        $command replace_sub1_with_file &&
                        test_superproject_content origin/replace_sub1_with_file &&
                        test_submodule_content sub1 origin/modify_sub1
                )
        '
+
+       test_expect_success "$command: changed submodule worktree is reset" '
+               prolog &&
+               reset_work_tree_to_interested add_sub1 &&
+               (
+                       cd submodule_update &&
+                       rm sub1/file1 &&
+                       : >sub1/new_file &&
+                       git -C sub1 add new_file &&
+                       $command HEAD &&
+                       test_path_is_file sub1/file1 &&
+                       test_path_is_missing sub1/new_file
+               )
+       '
 }