tests: enable to test standalone pulseaudio daemon

With this fix, `check-daemon` doesn't need a system-wide running pulseaudio
anymore.

The method to use is to invoke `make check-daemon` under `src/` and it just
works! :)

src/Makefile.am

@@ -303,11 +303,11 @@ TESTS = $(TESTS_default)
 if BUILD_TESTS_DEFAULT
 noinst_PROGRAMS = $(TESTS_default) $(TESTS_norun) $(TESTS_daemon)
 else
-check_PROGRAMS = $(TESTS_default) $(TESTS_norun) $(TESTS_daemon)
+check_PROGRAMS = $(TESTS_default) $(TESTS_norun)
 endif
 
-check-daemon:
+check-daemon: $(TESTS_daemon)
-	$(MAKE) check TESTS="$(TESTS_daemon)"
+	PATH=$(builddir):${PATH} $(top_srcdir)/src/tests/test-daemon.sh $(TESTS_daemon)
 
 mainloop_test_SOURCES = tests/mainloop-test.c
 mainloop_test_CFLAGS = $(AM_CFLAGS) $(LIBCHECK_CFLAGS)

src/tests/test-daemon.sh

@@ -0,0 +1,70 @@
+#!/bin/sh
+#
+# This script is modified from dbus's run-with-temp-session-bus.sh.
+#
+
+SCRIPTNAME=$0
+
+die()
+{
+    if ! test -z "$DBUS_SESSION_BUS_PID" ; then
+        echo "killing message bus "$DBUS_SESSION_BUS_PID >&2
+        kill -9 $DBUS_SESSION_BUS_PID
+    fi
+    echo $SCRIPTNAME: $* >&2
+    exit 1
+}
+
+## convenient to be able to ctrl+C without leaking the message bus process
+trap 'die "Received SIGINT"' INT
+
+unset DBUS_SESSION_BUS_ADDRESS
+unset DBUS_SESSION_BUS_PID
+
+echo "Running dbus-launch --sh-syntax" >&2
+
+eval `dbus-launch --sh-syntax`
+
+if test -z "$DBUS_SESSION_BUS_PID" ; then
+    die "Failed to launch message bus for test script to run"
+fi
+
+echo "Started bus pid $DBUS_SESSION_BUS_PID at $DBUS_SESSION_BUS_ADDRESS" >&2
+
+TEMP_PULSE_DIR=`mktemp -d`
+export PULSE_RUNTIME_PATH=${TEMP_PULSE_DIR}
+
+# this script would be called inside src/ directory, so we need to use the correct path.
+# notice that for tests, we don't load ALSA related modules.
+pulseaudio -n \
+        --log-target=file:${PWD}/pulse-daemon.log \
+        --log-level=debug \
+        --load="module-null-sink" \
+        --load="module-null-source" \
+        --load="module-suspend-on-idle" \
+        --load="module-native-protocol-unix" \
+        --load="module-cli-protocol-unix" \
+        &
+
+# wait a few seconds to let the daemon start!
+sleep 5
+
+unset DISPLAY
+
+for ONE_TEST in $@; do
+    ${ONE_TEST}
+done
+
+# terminate the designated pulseaudio daemon
+pacmd exit
+
+wait
+
+kill -TERM $DBUS_SESSION_BUS_PID || die "Message bus vanished! should not have happened" && echo "Killed daemon $DBUS_SESSION_BUS_PID" >&2
+
+sleep 2
+
+## be sure it really died
+kill -9 $DBUS_SESSION_BUS_PID > /dev/null 2>&1 || true
+
+exit 0