Adds a new test that checks for the presence of 'emacs',
and adds that test as a prereq to all subsequent tests
that rely on Emacs.

This causes tests with unmet dependencies to be skipped.

Signed-off-by: Pieter Praet <pieter@praet.org>
---
 test/crypto |   17 ++++++++++++++---
 1 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/test/crypto b/test/crypto
index 59f7989..c69307d 100755
--- a/test/crypto
+++ b/test/crypto
@@ -7,10 +7,21 @@
 test_description='PGP/MIME signature verification and decryption'
 . ./test-lib.sh
 
+# Emacs is a prereq.
+test_expect_success "prereq: Emacs is present" "which emacs" \
+    && test_set_prereq EMACS
+
 # GnuPG is a prereq.
 test_expect_success "prereq: GnuPG is present" "which gpg" \
     && test_set_prereq GPG
 
+# Some tests have multiple prereqs, but the test_expect_* functions
+# accept only a single argument as prereq tag, and using test_have_prereq
+# in and around tests causes various errors for me, so a dirty workaround
+# will have to do for the time being.
+test_have_prereq EMACS && test_have_prereq GPG \
+    && test_set_prereq EMACS+GPG
+
 
 add_gnupg_home ()
 {
@@ -36,7 +47,7 @@ FINGERPRINT=$(gpg --no-tty --list-secret-keys --with-colons --fingerprint | grep
 # although I can't figure out why
 add_email_corpus
 
-test_expect_success GPG 'emacs delivery of signed message' \
+test_expect_success EMACS+GPG 'emacs delivery of signed message' \
 'emacs_deliver_message \
     "test signed message 001" \
     "This is a test signed message." \
@@ -146,7 +157,7 @@ mv "${GNUPGHOME}"{.bak,}
 cat <<EOF >TESTATTACHMENT
 This is a test file.
 EOF
-test_expect_success GPG 'emacs delivery of encrypted message with attachment' \
+test_expect_success EMACS+GPG 'emacs delivery of encrypted message with attachment' \
 'emacs_deliver_message \
     "test encrypted message 001" \
     "This is a test encrypted message.\n" \
@@ -269,7 +280,7 @@ test_expect_equal GPG \
     "$expected"
 mv "${GNUPGHOME}"{.bak,}
 
-test_expect_success GPG 'emacs delivery of encrypted + signed message' \
+test_expect_success EMACS+GPG 'emacs delivery of encrypted + signed message' \
 'emacs_deliver_message \
     "test encrypted message 002" \
     "This is another test encrypted message.\n" \
-- 
1.7.4.1