emacs: test notmuch-show during message decryption

We did not have a test showing what message decryption looks like
within notmuch-emacs.  This change gives us a baseline for future work
on the notmuch-emacs interface.

This differs from previous revisions of this patch in that it should
be insensitive to the order in which the local filesystem readdir()s
the underlying maildir.

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>

test/T357-index-decryption.sh

@@ -224,10 +224,11 @@ add_email_corpus crypto
 
 test_begin_subtest "indexing message fails when secret key not available"
 notmuch reindex --decrypt=true id:simple-encrypted@crypto.notmuchmail.org
-output=$(notmuch dump )
-expected='#notmuch-dump batch-tag:3 config,properties,tags
-+encrypted +inbox +unread -- id:simple-encrypted@crypto.notmuchmail.org
-#= simple-encrypted@crypto.notmuchmail.org index.decryption=failure'
+output=$(notmuch dump | LC_ALL=C sort)
+expected='#= simple-encrypted@crypto.notmuchmail.org index.decryption=failure
+#notmuch-dump batch-tag:3 config,properties,tags
++encrypted +inbox +unread -- id:basic-encrypted@crypto.notmuchmail.org
++encrypted +inbox +unread -- id:simple-encrypted@crypto.notmuchmail.org'
 test_expect_equal \
     "$output" \
     "$expected"
@@ -245,8 +246,8 @@ notmuch restore <<EOF
 #= simple-encrypted@crypto.notmuchmail.org session-key=9%3AFC09987F5F927CC0CC0EE80A96E4C5BBF4A499818FB591207705DFDDD6112CF9
 EOF
 notmuch reindex id:simple-encrypted@crypto.notmuchmail.org
-output=$(notmuch search sekrit)
-expected='thread:0000000000000001   2016-12-22 [1/1] Daniel Kahn Gillmor; encrypted message (encrypted inbox unread)'
+output=$(notmuch search sekrit | notmuch_search_sanitize)
+expected='thread:XXX   2016-12-22 [1/1] Daniel Kahn Gillmor; encrypted message (encrypted inbox unread)'
 test_expect_equal \
     "$output" \
     "$expected"

test/T450-emacs-show.sh

@@ -208,4 +208,19 @@ test_emacs '(notmuch-show "id:'$gen_msg_id'")
 output=$(head -1 OUTPUT.raw|cut -f1-4 -d' ')
 test_expect_equal "$output" "Notmuch Test Suite <test_suite@notmuchmail.org>"
 
+
+# switching to the crypto corpus, using gpg from here on:
+add_gnupg_home
+add_email_corpus crypto
+
+test_begin_subtest "show decrypted message"
+test_emacs '(notmuch-show "id:basic-encrypted@crypto.notmuchmail.org")
+            (test-visible-output)'
+test_expect_equal_file $EXPECTED/notmuch-show-decrypted-message OUTPUT
+
+test_begin_subtest "show undecryptable message"
+test_emacs '(notmuch-show "id:simple-encrypted@crypto.notmuchmail.org")
+            (test-visible-output)'
+test_expect_equal_file $EXPECTED/notmuch-show-undecryptable-message OUTPUT
+
 test_done

test/corpora/crypto/basic-encrypted.eml

@@ -0,0 +1,28 @@
+From: test_suite@notmuchmail.org
+To: test_suite@notmuchmail.org
+Subject: Here is the password
+Date: Sat, 01 Jan 2000 12:00:00 +0000
+Message-ID: <basic-encrypted@crypto.notmuchmail.org>
+MIME-Version: 1.0
+Content-Type: multipart/encrypted; boundary="=-=-=";
+	protocol="application/pgp-encrypted"
+
+--=-=-=
+Content-Type: application/pgp-encrypted
+
+Version: 1
+
+--=-=-=
+Content-Type: application/octet-stream
+
+-----BEGIN PGP MESSAGE-----
+
+hIwDxE023q1UqxYBBACp70e7KPy9OYaheIrkLzmhq1lRqmy51aL1jBL0K/qN7rfK
+BZEG1cR8jeLjTFdPKPLVKJI80r7FgKI0ywvWvl6R1aE1Ty5BnVXT9XzCrEH7fqCl
+SKK82EvolXTohAZHUrh6K66eQQTTIAC1n7B0A8hErzkgaM4+seN3LlvezT6TLNKM
+ATpqsEbM2MVrGgw0b3oUsGGAPEt2MmjNEYsriKnqwt6dJDZc//XyhjgMQayiD8da
+N1gT3oqgu/gKCpBZDYzHf9OtVi2UnlFDWy6rrMZLjWDnIv4ve9Pn/qolwHVjzdJ1
+ZfjNC5t0z3XADKGrjN9wutr4qm7STW1rHAXHP68TQTxI0qgJKjPXNKWEw6g=
+=pJG4
+-----END PGP MESSAGE-----
+--=-=-=--

test/emacs-show.expected-output/notmuch-show-decrypted-message

@@ -0,0 +1,11 @@
+test_suite@notmuchmail.org (2000-01-01) (encrypted inbox)
+Subject: Here is the password
+To: test_suite@notmuchmail.org
+Date: Sat, 01 Jan 2000 12:00:00 +0000
+
+[ multipart/encrypted ]
+[ Decryption successful ]
+[ Unknown signature status ]
+[ application/pgp-encrypted ]
+[ text/plain ]
+The password is "abcd1234!", please do not tell anyone.

test/emacs-show.expected-output/notmuch-show-undecryptable-message

@@ -0,0 +1,10 @@
+Daniel Kahn Gillmor <dkg@fifthhorseman.net> (2016-12-22) (encrypted inbox)
+Subject: encrypted message
+To: dkg@fifthhorseman.net
+Date: Thu, 22 Dec 2016 08:34:56 -0400
+
+[ multipart/encrypted ]
+[ Decryption error ]
+[ Unknown signature status ]
+[ application/pgp-encrypted ]
+[ application/octet-stream ]