t3910: show failure of core.precomposeunicode with decomposed filenames

diff --git a/t/t3910-mac-os-precompose.sh b/t/t3910-mac-os-precompose.sh
index e4ba6013e41927bc0ec3ff3876648a71a71ce6e1..23aa61ef0904457ab97a5d132218464905783a7c 100755 (executable)
--- a/t/t3910-mac-os-precompose.sh
+++ b/t/t3910-mac-os-precompose.sh
@@ -140,6 +140,16 @@ test_expect_success "Add long precomposed filename" '
        git add * &&
        git commit -m "Long filename"
 '
+
+test_expect_failure 'handle existing decomposed filenames' '
+       echo content >"verbatim.$Adiarnfd" &&
+       git -c core.precomposeunicode=false add "verbatim.$Adiarnfd" &&
+       git commit -m "existing decomposed file" &&
+       >expect &&
+       git ls-files --exclude-standard -o "verbatim*" >untracked &&
+       test_cmp expect untracked
+'
+
 # Test if the global core.precomposeunicode stops autosensing
 # Must be the last test case
 test_expect_success "respect git config --global core.precomposeunicode" '