submodule update: continue when a checkout fails

diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index 045cee312cdeb515869eeeda3f7b167fb5b91504..92248d24c48a65ab89a5b0ad255357f6034e6ad4 100755 (executable)
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -851,4 +851,22 @@ test_expect_success 'subject lines do not have 822 atom-quoting' '
        test_cmp expect actual
 '
 
+cat >expect <<'EOF'
+Subject: [PREFIX 1/1] header with . in it
+EOF
+test_expect_success 'subject prefixes have space prepended' '
+       git format-patch -n -1 --stdout --subject-prefix=PREFIX >patch &&
+       grep ^Subject: patch >actual &&
+       test_cmp expect actual
+'
+
+cat >expect <<'EOF'
+Subject: [1/1] header with . in it
+EOF
+test_expect_success 'empty subject prefix does not have extra space' '
+       git format-patch -n -1 --stdout --subject-prefix= >patch &&
+       grep ^Subject: patch >actual &&
+       test_cmp expect actual
+'
+
 test_done