Test: Added APICAST_SERVICE_FILTER_BY_URL integration test.

This test validates that the parameter `APICAST_SERVICE_FILTER_BY_URL`
is working correctly across multiple services and the service discarding
is working correctly.

Signed-off-by: Eloy Coto <eloy.coto@gmail.com>

t/apicast-subset-of-services.t

@@ -54,3 +54,56 @@ __DATA__
 ["yay, api backend: /one/\n", ""]
 --- error_code eval
 [200, 404]
+
+
+
+=== TEST 2: multi service configuration limited with Regexp Filter
+--- env eval
+("APICAST_SERVICES_FILTER_BY_URL", "^on*")
+--- configuration
+{
+  "services": [
+    {
+      "backend_version": 1,
+      "proxy": {
+        "hosts": [
+          "one"
+        ],
+        "api_backend": "http://test:$TEST_NGINX_SERVER_PORT/api-backend/one/",
+        "proxy_rules": [
+          {
+            "http_method": "GET",
+            "delta": 1,
+            "metric_system_name": "one",
+            "pattern": "/"
+          }
+        ]
+      },
+      "id": 42
+    },
+    {
+      "proxy": {
+        "hosts": [
+          "two"
+        ]
+      },
+      "id": 11
+    }
+  ]
+}
+--- backend
+  location /transactions/authrep.xml {
+    content_by_lua_block { ngx.exit(200) }
+  }
+--- upstream
+  location ~ /api-backend(/.+) {
+     echo 'yay, api backend: $1';
+  }
+--- pipelined_requests eval
+["GET /?user_key=1","GET /?user_key=2"]
+--- more_headers eval
+["Host: one", "Host: two"]
+--- response_body eval
+["yay, api backend: /one/\n", ""]
+--- error_code eval
+[200, 404]