Improved Lua API testing system

Now the testing system allows vis to perform a few main loop cycles before quit.
It is necessary to check events in upcoming subprocess tests.

lua/test.sh

@@ -28,15 +28,18 @@ for t in $test_files; do
 	t=${t%.lua}
 	t=${t#./}
 	printf "%-30s" "$t"
-	$VIS "$t.in" < /dev/null 2> /dev/null > "$t.busted"
-
+	mkfifo infifo
+	$VIS "$t.in" <infifo 2> /dev/null > "$t.busted" &
+	for i in 1;	do sleep 0.1s; echo ":qall!"; done > infifo &
+	wait %1 && wait %2
 	if [ $? -ne 0 ]; then
 		printf "FAIL\n"
 		cat "$t.busted"
 	else
 		TESTS_OK=$((TESTS_OK + 1))
 		printf "OK\n"
 	fi
+	rm infifo
 done
 
 printf "Tests ok %d/%d\n" $TESTS_OK $TESTS_RUN

lua/visrc.lua

@@ -6,7 +6,7 @@ io.stderr = io.stdout
 
 -- make sure we gracefully terminate, cleanup terminal state etc.
 os.exit = function(status)
-	vis:exit(status)
+	if status ~= 0 then vis:exit(status) end
 end
 
 vis.events.subscribe(vis.events.WIN_OPEN, function(win)
@@ -24,5 +24,4 @@ vis.events.subscribe(vis.events.WIN_OPEN, function(win)
 			return
 		end
 	end
-	vis:exit(0)
 end)