diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 226db83..ef8797f 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -1430,6 +1430,15 @@
 def Test_expr7_register()
   @a = 'register a'
   assert_equal('register a', @a)
+
+  let fname = expand('%')
+  assert_equal(fname, @%)
+
+  feedkeys(":echo 'some'\<CR>", "xt")
+  assert_equal("echo 'some'", @:)
+
+  normal axyz
+  assert_equal("xyz", @.)
 enddef
 
 def Test_expr7_namespace()