test: Make the emacsclient binary user-configurable

And require that if TEST_EMACS is specified, so is TEST_EMACSCLIENT.

Previously, the test framework always used "emacsclient", even if the
Emacs in use was overridden by TEST_EMACS.  This causes problems if
both Emacs 23 and Emacs 24 are installed, the Emacs 23 emacsclient is
the system default, but TEST_EMACS is set to emacs24.  Specifically,
with an Emacs 24 server and an Emacs 23 client, emacs tests that run
very quickly may produce no output from emacsclient, causing the test
to fail.

The Emacs server uses a very simple line-oriented protocol in which
the client sends a request to evaluate an expression and the server
sends a request to print the result of evaluation.  Prior to Emacs bzr
commit 107565 on March 11th, 2012 (released in Emacs 24.1), if
multiple commands were sent to the emacsclient between when it sent
the evaluation command and when it entered its receive loop, it would
only process the first response command, ignoring the rest of the
received buffer.  This wasn't a problem with the Emacs 23 server
because it sent only the command to print the evaluation result.
However, the Emacs 24 server first sends an unprompted command
specifying the PID of the Emacs server, then processes the evaluation
request, then sends the command to print the result.  If the
evaluation is fast enough, it can send both of these commands before
emacsclient enters the receive loop.  Hence, if an Emacs 24 server is
used with an Emacs 23 emacsclient, it may miss the response printing
command, ultimately causing intermittent notmuch test failures.

test/README

@@ -69,12 +69,12 @@ can be specified as follows:
 
 	make test OPTIONS="--verbose"
 
-You can choose an emacs binary to run the tests in one of the
+You can choose an emacs binary (and corresponding emacsclient) to run
-following ways.
+the tests in one of the following ways.
 
-	TEST_EMACS=my-special-emacs make test
+	TEST_EMACS=my-special-emacs TEST_EMACSCLIENT=my-emacsclient make test
-	TEST_EMACS=my-special-emacs ./emacs
+	TEST_EMACS=my-special-emacs TEST_EMACSCLIENT=my-emacsclient ./emacs
-	make test TEST_EMACS=my-special-emacs
+	make test TEST_EMACS=my-special-emacs TEST_EMACSCLIENT=my-emacsclient
 
 Skipping Tests
 --------------

test/test-lib.sh

@@ -49,7 +49,13 @@ TZ=UTC
 TERM=dumb
 export LANG LC_ALL PAGER TERM TZ
 GIT_TEST_CMP=${GIT_TEST_CMP:-diff -u}
+if [[ ( -n "$TEST_EMACS" && -z "$TEST_EMACSCLIENT" ) || \
+      ( -z "$TEST_EMACS" && -n "$TEST_EMACSCLIENT" ) ]]; then
+    echo "error: must specify both or neither of TEST_EMACS and TEST_EMACSCLIENT" >&2
+    exit 1
+fi
 TEST_EMACS=${TEST_EMACS:-${EMACS:-emacs}}
+TEST_EMACSCLIENT=${TEST_EMACSCLIENT:-emacsclient}
 
 # Protect ourselves from common misconfiguration to export
 # CDPATH into the environment
@@ -969,7 +975,7 @@ test_emacs () {
 	missing_dependencies=
 	test_require_external_prereq dtach || missing_dependencies=1
 	test_require_external_prereq emacs || missing_dependencies=1
-	test_require_external_prereq emacsclient || missing_dependencies=1
+	test_require_external_prereq ${TEST_EMACSCLIENT} || missing_dependencies=1
 	test -z "$missing_dependencies" || return
 
 	if [ -z "$EMACS_SERVER" ]; then
@@ -1005,7 +1011,7 @@ test_emacs () {
 	rm -f OUTPUT
 	touch OUTPUT
 
-	emacsclient --socket-name="$EMACS_SERVER" --eval "(progn $@)"
+	${TEST_EMACSCLIENT} --socket-name="$EMACS_SERVER" --eval "(progn $@)"
 }
 
 test_python() {
@@ -1158,7 +1164,7 @@ rm -f y
 # declare prerequisites for external binaries used in tests
 test_declare_external_prereq dtach
 test_declare_external_prereq emacs
-test_declare_external_prereq emacsclient
+test_declare_external_prereq ${TEST_EMACSCLIENT}
 test_declare_external_prereq gdb
 test_declare_external_prereq gpg
 test_declare_external_prereq python