Add a test-case for backend reference errors.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2884 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishtest/tests/v00002.vtc

@@ -34,3 +34,13 @@ varnish v1 -badvcl {
 		.connect_timeout = 1m;
 	}
 }
+
+# Check backend reference by name
+varnish v1 -badvcl {
+	backend b1 { .host = "127.0.0.2"; }
+	director r1 random {
+		{ .weight = 1; .backend = b1; }
+		{ .weight = 1; .backend = { .host = "127.0.0.3"; } }
+		{ .weight = 1; .backend = 3745; }  // Brownie points for getting the joke
+	}
+}