chore(test): busted script support system trusted certificate store

bin/busted

@@ -4,7 +4,22 @@ setmetatable(_G, nil)
 
 local pl_path = require("pl.path")
 
-local cert_path = pl_path.abspath("spec/fixtures/kong_spec.crt")
+local pl_file = require("pl.file")
+
+local tools_system = require("kong.tools.system")
+
+local cert_path do
+  local busted_cert_file = pl_path.tmpname()
+  local busted_cert_content = pl_file.read("spec/fixtures/kong_spec.crt")
+
+  local system_cert_path, err = tools_system.get_system_trusted_certs_filepath()
+  if system_cert_path then
+    busted_cert_content = busted_cert_content .. pl_file.read(system_cert_path)
+  end
+
+  pl_file.write(busted_cert_file, busted_cert_content)
+  cert_path = busted_cert_file
+end
 
 local DEFAULT_RESTY_FLAGS=string.format(" -c 4096 --http-conf 'lua_ssl_trusted_certificate %s;' ", cert_path)