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-rwxr-xr-xt/t4014-format-patch.sh18
1 files changed, 18 insertions, 0 deletions
diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index 045cee312c..92248d24c4 100755
--- 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