test: start new corpus of test messages for indexing code

This particular message is not recognized by notmuch as mail, but is
fine according to e.g. mutt. The trigger for this bad behaviour seems
to be a second "From " ocurring at the beginning of the line but
inside an attachment.

test/corpora/indexing/mbox-attachment.eml

@@ -0,0 +1,83 @@
+From david@tethera.net  Sat Feb  5 09:19:10 2022
+From: David Bremner <david@tethera.net>
+To: David Bremner <david@tethera.net>
+Subject: Re: [RFC PATCH v2 12/12] emacs: whitespace cleanup for keybindings
+Date: Sat, 05 Feb 2022 10:19:09 -0400
+Message-ID: <87k0e9o0pu.fsf@tethera.net>
+MIME-Version: 1.0
+Content-Type: multipart/mixed; boundary="=-=-="
+
+--=-=-=
+Content-Type: text/plain
+Content-Disposition: inline
+
+
+I figured out the race condition in the tests. The previous test was
+still running when the failing test started, the joys of using a shared
+emacs for running all of the tests in one file.
+
+The attached diff is split into the the commits that introduce the tests
+in question in my working series, but you should be able to just apply
+it on top of the posted series if you want.
+
+
+--=-=-=
+Content-Type: text/x-diff
+Content-Disposition: inline; filename=0001-test-fixups.patch
+
+From fc88cba7f1f37b9cf3b296eace2422dd0e173502 Mon Sep 17 00:00:00 2001
+From: David Bremner <david@tethera.net>
+Date: Thu, 3 Feb 2022 21:05:05 -0400
+Subject: [PATCH] test fixups
+
+---
+ test/T315-emacs-tagging.sh | 9 ++++-----
+ 1 file changed, 4 insertions(+), 5 deletions(-)
+
+diff --git a/test/T315-emacs-tagging.sh b/test/T315-emacs-tagging.sh
+index c9e3e53a..c26413ce 100755
+--- a/test/T315-emacs-tagging.sh
++++ b/test/T315-emacs-tagging.sh
+@@ -119,7 +119,8 @@ for mode in search show tree unthreaded; do
+       (notmuch-$mode \"$os_x_darwin_thread\")
+       (notmuch-test-wait)
+       (execute-kbd-macro \"+tag-to-be-undone-$mode\")
+-      (notmuch-tag-undo))"
++      (notmuch-tag-undo)
++      (notmuch-test-wait))"
+     count=$(notmuch count "tag:tag-to-be-undone-$mode")
+     test_expect_equal "$count" "0"
+ 
+@@ -128,9 +129,7 @@ for mode in search show tree unthreaded; do
+       (notmuch-$mode \"$os_x_darwin_thread\")
+       (notmuch-test-wait)
+       (execute-kbd-macro \"+one-$mode\")
+-      (notmuch-test-wait)
+       (execute-kbd-macro \"+two-$mode\")
+-      (notmuch-test-wait)
+       (notmuch-tag-undo)
+       (notmuch-test-wait)
+       (execute-kbd-macro \"+three-$mode\"))"
+@@ -143,7 +142,6 @@ for mode in search show tree unthreaded; do
+       (notmuch-$mode \"$os_x_darwin_thread\")
+       (notmuch-test-wait)
+       (execute-kbd-macro \"+one-$mode\")
+-      (notmuch-test-wait)
+       (execute-kbd-macro \"+two-$mode\")
+       (notmuch-tag-undo)
+       (notmuch-test-wait)
+@@ -159,7 +157,8 @@ for mode in search show tree unthreaded; do
+       (notmuch-$mode \"$os_x_darwin_thread\")
+       (notmuch-test-wait)
+       (execute-kbd-macro \"+tag-to-be-undone-$mode\")
+-      (execute-kbd-macro (kbd \"C-x u\")))"
++      (execute-kbd-macro (kbd \"C-x u\"))
++      (notmuch-test-wait))"
+     count=$(notmuch count "tag:tag-to-be-undone-$mode")
+     test_expect_equal "$count" "0"
+ done
+-- 
+2.30.2
+
+
+--=-=-=--