patch 8.2.0243: insufficient code coverage for ex_docmd.c functions

Problem:    Insufficient code coverage for ex_docmd.c functions.
Solution:   Add more tests. (Yegappan Lakshmanan, closes #5618)
diff --git a/src/testdir/test_mapping.vim b/src/testdir/test_mapping.vim
index 7aeb23c..00dfc5b 100644
--- a/src/testdir/test_mapping.vim
+++ b/src/testdir/test_mapping.vim
@@ -552,6 +552,13 @@
   map <expr> ,f abc
   call assert_fails('normal ,f', 'E121:')
   unmap <expr> ,f
+
+  " Recursive use of :normal in a map
+  set maxmapdepth=100
+  map gq :normal gq<CR>
+  call assert_fails('normal gq', 'E192:')
+  unmap gq
+  set maxmapdepth&
 endfunc
 
 " Test for <special> key mapping