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-rw-r--r--src/testdir/test_vim9_builtin.vim4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index 73251c0bac..8f112174e5 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -123,6 +123,10 @@ def Test_append()
var res2: bool = append(3, 'two')
assert_equal(false, res2)
assert_equal(['0', 'one', '1', 'two', '2'], getline(1, 6))
+
+ append(0, 'zero')
+ assert_equal('zero', getline(1))
+ bwipe!
enddef
def Test_balloon_show()