1 files changed, 44 insertions, 0 deletions
diff --git a/src/nvim/testdir/test_preview.vim b/src/nvim/testdir/test_preview.vim
index 91923fb1e9..6c4ae414d3 100644
--- a/src/nvim/testdir/test_preview.vim
+++ b/src/nvim/testdir/test_preview.vim
@@ -11,3 +11,47 @@ func Test_Psearch()
   call assert_equal(wincount, winnr('$'))
   bwipe
 endfunc
+
+func Test_window_preview()
+  " Open a preview window
+  pedit Xa
+  call assert_equal(2, winnr('$'))
+  call assert_equal(0, &previewwindow)
+
+  " Go to the preview window
+  wincmd P
+  call assert_equal(1, &previewwindow)
+  call assert_equal('preview', win_gettype())
+
+  " Close preview window
+  wincmd z
+  call assert_equal(1, winnr('$'))
+  call assert_equal(0, &previewwindow)
+
+  call assert_fails('wincmd P', 'E441:')
+endfunc
+
+func Test_window_preview_from_help()
+  filetype on
+  call writefile(['/* some C code */'], 'Xpreview.c')
+  help
+  pedit Xpreview.c
+  wincmd P
+  call assert_equal(1, &previewwindow)
+  call assert_equal('c', &filetype)
+  wincmd z
+
+  filetype off
+  close
+  call delete('Xpreview.c')
+endfunc
+
+func Test_multiple_preview_windows()
+  new
+  set previewwindow
+  new
+  call assert_fails('set previewwindow', 'E590:')
+  %bw!
+endfunc
+
+" vim: shiftwidth=2 sts=2 expandtab