test: add external prereqs to many emacs tests

The tests fail otherwise.

Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

test/T310-emacs.sh

@@ -5,6 +5,7 @@ test_description="emacs interface"
 
 EXPECTED=$NOTMUCH_SRCDIR/test/emacs.expected-output
 
+test_require_emacs
 add_email_corpus
 
 # syntax errors in test-lib.el cause mysterious failures

test/T350-crypto.sh

@@ -9,6 +9,7 @@ test_description='PGP/MIME signature verification and decryption'
 
 ##################################################
 
+test_require_emacs
 add_gnupg_home
 
 test_begin_subtest "emacs delivery of signed message"

test/T355-smime.sh

@@ -3,6 +3,7 @@
 test_description='S/MIME signature verification and decryption'
 . $(dirname "$0")/test-lib.sh || exit 1
 
+test_require_emacs
 test_require_external_prereq openssl
 test_require_external_prereq gpgsm
 

test/T357-index-decryption.sh

@@ -7,6 +7,7 @@ test_description='indexing decrypted mail'
 
 ##################################################
 
+test_require_emacs
 add_gnupg_home
 
 # create a test encrypted message

test/T450-emacs-show.sh

@@ -5,6 +5,7 @@ test_description="emacs notmuch-show view"
 
 EXPECTED=$NOTMUCH_SRCDIR/test/emacs-show.expected-output
 
+test_require_emacs
 add_email_corpus
 
 test_begin_subtest "Hiding Original Message region at beginning of a message"

test/T460-emacs-tree.sh

@@ -5,6 +5,7 @@ test_description="emacs tree view interface"
 
 EXPECTED=$NOTMUCH_SRCDIR/test/emacs-tree.expected-output
 
+test_require_emacs
 add_email_corpus
 
 test_begin_subtest "Basic notmuch-tree view in emacs"

test/T730-emacs-forwarding.sh

@@ -3,6 +3,8 @@
 test_description="emacs forwarding"
 . $(dirname "$0")/test-lib.sh || exit 1
 
+test_require_emacs
+
 test_begin_subtest "Forward setting the correct references header"
 # Check that, when forwarding a message, the new message has
 # a References-header pointing to the original (forwarded) message.

test/test-lib.sh

@@ -114,6 +114,12 @@ unset ALTERNATE_EDITOR
 unset EMAIL
 unset NAME
 
+test_require_emacs () {
+    test_require_external_prereq emacs
+    test_require_external_prereq ${TEST_EMACSCLIENT}
+    test_require_external_prereq dtach
+}
+
 add_gnupg_home ()
 {
     [ -e "${GNUPGHOME}/gpg.conf" ] && return