[PATCH 4/4] t4014: add tests to cover --resend option and its exclusivity

[Dragan Simic <dsimic@manjaro.org>]

Add a few new tests to the t4014 that cover the --resend command-line option
for "git format-patch", which include the tests for its exclusivity with the
already existing -k and --rfc command-line options.

Signed-off-by: Dragan Simic <dsimic@manjaro.org>
---
 t/t4014-format-patch.sh | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/t/t4014-format-patch.sh b/t/t4014-format-patch.sh
index e22c4ac34e6e..bcf7b633e78f 100755
--- a/t/t4014-format-patch.sh
+++ b/t/t4014-format-patch.sh
@@ -1401,6 +1401,43 @@ test_expect_success '--rfc and -k cannot be used together' '
 	test_must_fail git format-patch -1 --stdout --rfc -k >patch
 '
 
+test_expect_success '--resend' '
+	cat >expect <<-\EOF &&
+	Subject: [PATCH RESEND 1/1] header with . in it
+	EOF
+	git format-patch -n -1 --stdout --resend >patch &&
+	grep "^Subject:" patch >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--resend does not overwrite prefix' '
+	cat >expect <<-\EOF &&
+	Subject: [PATCH RFC RESEND 1/1] header with . in it
+	EOF
+	git -c format.subjectPrefix="PATCH RFC" \
+		format-patch -n -1 --stdout --resend >patch &&
+	grep "^Subject:" patch >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--resend is argument order independent' '
+	cat >expect <<-\EOF &&
+	Subject: [PATCH RFC RESEND 1/1] header with . in it
+	EOF
+	git format-patch -n -1 --stdout --resend \
+		--subject-prefix="PATCH RFC" >patch &&
+	grep "^Subject:" patch >actual &&
+	test_cmp expect actual
+'
+
+test_expect_success '--resend and -k cannot be used together' '
+	test_must_fail git format-patch -1 --stdout --resend -k >patch
+'
+
+test_expect_success '--rfc and --resend cannot be used together' '
+	test_must_fail git format-patch -1 --stdout --rfc --resend >patch
+'
+
 test_expect_success '--from=ident notices bogus ident' '
 	test_must_fail git format-patch -1 --stdout --from=foo >patch
 '