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/emacs-large-search-buffer |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/test/emacs-large-search-buffer b/test/emacs-large-search-buffer
index c78ce33..063f121 100755
--- a/test/emacs-large-search-buffer
+++ b/test/emacs-large-search-buffer
@@ -2,6 +2,11 @@
 test_description="Emacs with large search results buffer"
 . test-lib.sh
 
+# Emacs is a prereq.
+test_expect_success "prereq: Emacs is present" "which emacs" \
+    && test_set_prereq EMACS
+
+
 x=xxxxxxxxxx # 10
 x=$x$x$x$x$x$x$x$x$x$x # 100
 x=$x$x$x$x$x$x$x$x$x # 900
@@ -23,11 +28,11 @@ expected="$(notmuch search '*' | sed -e 's/^thread:[0-9a-f]*  //' -e 's/;//' -e
 End of search results."
 
 output=$(test_emacs '(notmuch-search "*") (notmuch-test-wait) (princ (buffer-string))' | sed -e s',  *, ,g' -e 's/xxx*/[BLOB]/g')
-test_expect_equal "$output" "$expected"
+test_expect_equal EMACS "$output" "$expected"
 
 test_begin_subtest "Ensure that emacs doesn't drop error messages"
 output=$(test_emacs '(notmuch-search "--this-option-does-not-exist") (notmuch-test-wait) (princ (buffer-string))')
-test_expect_equal "$output" "Error: Unexpected output from notmuch search:
+test_expect_equal EMACS "$output" "Error: Unexpected output from notmuch search:
 Unrecognized option: --this-option-does-not-exist
 End of search results. (process returned 1)"
 
-- 
1.7.4.1