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-rw-r--r--src/nvim/testdir/test_functions.vim2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/nvim/testdir/test_functions.vim b/src/nvim/testdir/test_functions.vim
index 6ef20107d8..1b9b9abd91 100644
--- a/src/nvim/testdir/test_functions.vim
+++ b/src/nvim/testdir/test_functions.vim
@@ -1018,7 +1018,9 @@ func Test_charidx()
call assert_equal(2, charidx(a, 4))
call assert_equal(3, charidx(a, 7))
call assert_equal(-1, charidx(a, 8))
+ call assert_equal(-1, charidx(a, -1))
call assert_equal(-1, charidx('', 0))
+ call assert_equal(-1, charidx(v:_null_string, 0))
" count composing characters
call assert_equal(0, charidx(a, 0, 1))