patch 8.2.3155: some option related code not covered by tests

Problem:    Some option related code not covered by tests.
Solution:   Add a few test cases. (Dominique Pellé, closes #8552)
diff --git a/src/testdir/test_options.vim b/src/testdir/test_options.vim
index dedac5a..e10ad54 100644
--- a/src/testdir/test_options.vim
+++ b/src/testdir/test_options.vim
@@ -933,6 +933,28 @@
   set autoread&
 endfunc
 
+func Test_set_in_sandbox()
+  " Some boolean options cannot be set in sandbox, some can.
+  call assert_fails('sandbox set modelineexpr', 'E48:')
+  sandbox set number
+  call assert_true(&number)
+  set number&
+
+  " Some boolean options cannot be set in sandbox, some can.
+  if has('python') || has('python3')
+    call assert_fails('sandbox set pyxversion=3', 'E48:')
+  endif
+  sandbox set tabstop=4
+  call assert_equal(4, &tabstop)
+  set tabstop&
+
+  " Some string options cannot be set in sandbox, some can.
+  call assert_fails('sandbox set backupdir=/tmp', 'E48:')
+  sandbox set filetype=perl
+  call assert_equal('perl', &filetype)
+  set filetype&
+endfunc
+
 " Test for incrementing, decrementing and multiplying a number option value
 func Test_opt_num_op()
   set shiftwidth=4
@@ -1149,4 +1171,26 @@
   set noerrorbells
 endfunc
 
+func Test_opt_scrolljump()
+  help
+  resize 10
+
+  " Test with positive 'scrolljump'.
+  set scrolljump=2
+  norm! Lj
+  call assert_equal({'lnum':11, 'leftcol':0, 'col':0, 'topfill':0,
+        \            'topline':3, 'coladd':0, 'skipcol':0, 'curswant':0},
+        \           winsaveview())
+
+  " Test with negative 'scrolljump' (percentage of window height).
+  set scrolljump=-40
+  norm! ggLj
+  call assert_equal({'lnum':11, 'leftcol':0, 'col':0, 'topfill':0,
+         \            'topline':5, 'coladd':0, 'skipcol':0, 'curswant':0},
+         \           winsaveview())
+
+  set scrolljump&
+  bw
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab