[PATCH] test: add regression test for Subject with newline.

[David Bremner <david@tethera.net>]

This tests the issue reported by Thibault in id:87wn9w4xus.fsf@thb.lt
---

I could not duplicate the problem here. Maybe it depends on the version of gmime?
I have 3.2.9 here.

 test/T050-new.sh                         |  4 ++++
 test/corpora/indexing/subject-newline:2, | 10 ++++++++++
 2 files changed, 14 insertions(+)
 create mode 100644 test/corpora/indexing/subject-newline:2,

diff --git a/test/T050-new.sh b/test/T050-new.sh
index cb67889c..0ac9fd7c 100755
--- a/test/T050-new.sh
+++ b/test/T050-new.sh
@@ -463,4 +463,8 @@ notmuch search id:20200930101213.2m2pt3jrspvcrxfx@localhost.localdomain > EXPECT
 notmuch search id:20200930101213.2m2pt3jrspvcrxfx@localhost.localdomain and ersatz > OUTPUT
 test_expect_equal_file_nonempty EXPECTED OUTPUT
 
+test_begin_subtest "base64 subject with newline"
+output=$(notmuch show id:subject-with-newline@shopping.com | grep ^Subject:)
+test_expect_equal "${output}" \
+		  "Subject: Livraison prévue pour aujourd’hui: RESTRAP Saddle Bag Saccoche..."
 test_done
diff --git a/test/corpora/indexing/subject-newline:2, b/test/corpora/indexing/subject-newline:2,
new file mode 100644
index 00000000..bb2dde55
--- /dev/null
+++ b/test/corpora/indexing/subject-newline:2,
@@ -0,0 +1,10 @@
+From: "Thibault" <thibault@example.com>
+To: notmuch@notmuchmail.org
+Date: Wed, 18 Nov 2009 02:08:10 -0800
+Subject: =?UTF-8?B?TGl2cmFpc29uIHByw6l2dWUgcG91ciBhdWpvdXJk4oCZaHU=?=
+ =?UTF-8?B?aTogUkVTVFJBUCBTYWRkbGUgQmFnIFNhY2NvY2hlLi4u?=
+Message-ID: <subject-with-newline@shopping.com>
+
+The subject should be
+
+> Livraison prévue pour aujourd’hui: RESTRAP Saddle Bag Saccoche...
-- 
2.35.2
\r