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-rw-r--r--src/nvim/testdir/test_fileformat.vim9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/nvim/testdir/test_fileformat.vim b/src/nvim/testdir/test_fileformat.vim
index 81127ea59a..8d727a68c4 100644
--- a/src/nvim/testdir/test_fileformat.vim
+++ b/src/nvim/testdir/test_fileformat.vim
@@ -31,6 +31,15 @@ func Test_fileformat_autocommand()
bw!
endfunc
+func Test_fileformat_nomodifiable()
+ new
+ setlocal nomodifiable
+
+ call assert_fails('set fileformat=latin1', 'E21:')
+
+ bw
+endfunc
+
" Convert the contents of a file into a literal string
func s:file2str(fname)
let b = readfile(a:fname, 'B')