chore(test) revert to regular busted, no more rbusted (#121)

.busted

@@ -1,5 +1,6 @@
 return {
   default = {
+    lua = "spec/resty-runner.lua",
     verbose = true,
     coverage = false,
     output = "gtest",

.travis.yml

@@ -48,4 +48,4 @@ install:
 
 script:
   - luacheck ./src
-  - ./rbusted --lpath=`pwd`/src/?.lua ./spec/
+  - busted

spec/resty-runner.lua

@@ -0,0 +1,27 @@
+#!/usr/bin/env resty
+
+-- script to run Busted tests using Openresty while setting some extra flags.
+--
+-- This script should be specified as:
+--   busted --lua=<this-file>
+--
+-- Alternatively specify it in the `.busted` config file
+
+
+-- These flags are passed to `resty` by default, to allow for more connections
+-- and disable the Global variable write-guard. Override it by setting the
+-- environment variable `BUSTED_RESTY_FLAGS`.
+local RESTY_FLAGS=os.getenv("BUSTED_RESTY_FLAGS") or "-c 4096 -e 'setmetatable(_G, nil)'"
+
+-- rebuild the invoked commandline, while inserting extra resty-flags
+local cmd = {
+  "exec",
+  arg[-1],
+  RESTY_FLAGS,
+}
+for i, param in ipairs(arg) do
+  table.insert(cmd, "'" .. param .. "'")
+end
+
+local _, _, rc = os.execute(table.concat(cmd, " "))
+os.exit(rc)