vim-patch:8.2.3476: renaming a buffer on startup may cause using freed memory

Problem:    Renaming a buffer on startup may cause using freed memory.
Solution:   Check if the buffer is used in a window. (closes vim/vim#8955)

https://github.com/vim/vim/commit/d3710cf01ef6ab1b2f233866ff01dab76686f642

Cherry-pick Test_echo_true_in_cmd() from Vim.

Co-authored-by: Bram Moolenaar <Bram@vim.org>

1 files changed, 30 insertions, 0 deletions

diff --git a/test/old/testdir/test_startup.vim b/test/old/testdir/test_startup.vim
index c80d98925a..c46b4002c2 100644
--- a/test/old/testdir/test_startup.vim
+++ b/test/old/testdir/test_startup.vim
@@ -1276,4 +1276,34 @@ func Test_write_in_vimrc()
   call delete('Xvimrc')
 endfunc
 
+func Test_echo_true_in_cmd()
+  CheckNotGui
+
+  let lines =<< trim END
+      echo v:true
+      call writefile(['done'], 'Xresult')
+      quit
+  END
+  call writefile(lines, 'Xscript')
+  if RunVim([], [], '--cmd "source Xscript"')
+    call assert_equal(['done'], readfile('Xresult'))
+  endif
+  call delete('Xscript')
+  call delete('Xresult')
+endfunc
+
+func Test_rename_buffer_on_startup()
+  let lines =<< trim END
+      call writefile(['done'], 'Xresult')
+      qa!
+  END
+  call writefile(lines, 'Xscript')
+  if RunVim([], [], "--clean -e -s --cmd 'file x|new|file x' --cmd 'so Xscript'")
+    call assert_equal(['done'], readfile('Xresult'))
+  endif
+  call delete('Xscript')
+  call delete('Xresult')
+endfunc
+
+
 " vim: shiftwidth=2 sts=2 expandtab