test-spawn-snid.lua: Use test client instead of urxvt

Startup notification support in urxvt is optional while GTK always supports
startup notification. Thus, use the new GTK-based test client for the SN tests.

Fixes: https://github.com/awesomeWM/awesome/issues/848
Signed-off-by: Uli Schlachter <psychon@znc.in>

tests/_client.lua

@@ -3,7 +3,7 @@ local spawn = require("awful.spawn")
 -- This file provide a simple, yet flexible, test client.
 -- It is used to test the `awful.rules`
 
-return function(class, title)
+return function(class, title, use_sn)
     title = title or 'Awesome test client'
 
     local cmd = {"lua" , "-e", table.concat {
@@ -28,5 +28,5 @@ return function(class, title)
         "app:run {''}"
     }}
 
-    spawn(cmd)
+    return spawn(cmd, use_sn)
 end

tests/test-spawn-snid.lua

@@ -1,7 +1,7 @@
 --- Tests for spawn's startup notifications.
 
 local runner = require("_runner")
-local spawn = require("awful.spawn")
+local test_client = require("_client")
 
 local manage_called, c_snid
 
@@ -15,7 +15,7 @@ local ret, snid
 local steps = {
   function(count)
     if count == 1 then
-      ret, snid = spawn('urxvt', true)
+      ret, snid = test_client("foo", "bar", true)
     elseif manage_called then
       assert(ret)
       assert(snid)
@@ -29,7 +29,7 @@ local steps = {
   function(count)
     if count == 1 then
       manage_called = false
-      ret, snid = spawn('urxvt', false)
+      ret, snid = test_client("bar", "foo", false)
     elseif manage_called then
       assert(ret)
       assert(snid == nil)