vim-patch:9.0.1653: Amiga: default 'viewdir' may not work

Problem:    Amiga: default 'viewdir' may not work.
Solution:   Use "home:" instead of "$VIM". Add a test. (Christian Brabandt,
            closes vim/vim#12576)

b8b1c8ebd4

Cherry-pick Test_mkview_manual_fold() changes from 9.0.{0363,0626}.

Co-authored-by: Christian Brabandt <cb@256bit.org>
(cherry picked from commit 827cfe4a76)

test/old/testdir/setup.vim

@@ -109,6 +109,10 @@ if executable('gem')
   let $GEM_PATH = system('gem env gempath')
 endif
 
+" Have current $HOME available as $ORIGHOME.  $HOME is used for option
+" defaults before we get here, and test_mksession checks that.
+let $ORIGHOME = $HOME
+
 " Make sure $HOME does not get read or written.
 let $HOME = expand(getcwd() . '/XfakeHOME')
 if !isdirectory($HOME)

test/old/testdir/test_mksession.vim

@@ -1170,8 +1170,8 @@ endfunc
 
 " Test for creating views with manual folds
 func Test_mkview_manual_fold()
-  call writefile(range(1,10), 'Xfile')
-  new Xfile
+  call writefile(range(1,10), 'Xmkvfile', 'D')
+  new Xmkvfile
   " create recursive folds
   5,6fold
   4,7fold
@@ -1194,9 +1194,22 @@ func Test_mkview_manual_fold()
   source Xview
   call assert_equal([-1, -1, -1, -1, -1, -1], [foldclosed(3), foldclosed(4),
         \ foldclosed(5), foldclosed(6), foldclosed(7), foldclosed(8)])
-  call delete('Xfile')
   call delete('Xview')
   bw!
 endfunc
 
+" Test default 'viewdir' value
+func Test_mkview_default_home()
+  throw 'Skipped: N/A'
+  if has('win32')
+    call assert_match('^' .. $ORIGHOME .. '/vimfiles', &viewdir)
+  elseif has('unix')
+    call assert_match('^' .. $ORIGHOME .. '/.vim', &viewdir)
+  elseif has('amiga')
+    call assert_match('^home:vimfiles', &viewdir)
+  elseif has('mac')
+    call assert_match('^' .. $VIM .. '/vimfiles', &viewdir)
+  endif
+endfunc
+
 " vim: shiftwidth=2 sts=2 expandtab