patch 8.2.0174: various commands not completely tested

Problem:    Various commands not completely tested.
Solution:   Add more test cases. (Yegappan Lakshmanan, closes #5551)
diff --git a/src/testdir/test_move.vim b/src/testdir/test_move.vim
index d774c93..f666a90 100644
--- a/src/testdir/test_move.vim
+++ b/src/testdir/test_move.vim
@@ -35,6 +35,11 @@
 
   call assert_fails('1,2move 1', 'E134')
   call assert_fails('2,3move 2', 'E134')
+  call assert_fails("move -100", 'E16:')
+  call assert_fails("move +100", 'E16:')
+  call assert_fails('move', 'E16:')
 
   %bwipeout!
 endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab