perf: add test for writing the index

diff --git a/t/t5526-fetch-submodules.sh b/t/t5526-fetch-submodules.sh
index f3b0a8d30afcb472398bef8623a49ba6bac7dc24..162baf101f340885619e0a1e67b0b14cf37a2347 100755 (executable)
--- a/t/t5526-fetch-submodules.sh
+++ b/t/t5526-fetch-submodules.sh
@@ -71,6 +71,16 @@ test_expect_success "fetch --recurse-submodules recurses into submodules" '
        test_i18ncmp expect.err actual.err
 '
 
+test_expect_success "submodule.recurse option triggers recursive fetch" '
+       add_upstream_commit &&
+       (
+               cd downstream &&
+               git -c submodule.recurse fetch >../actual.out 2>../actual.err
+       ) &&
+       test_must_be_empty actual.out &&
+       test_i18ncmp expect.err actual.err
+'
+
 test_expect_success "fetch --recurse-submodules -j2 has the same output behaviour" '
        add_upstream_commit &&
        (