fix: correct the previous test case. (#190)

Author: spacewander

lib/resty/etcd/v3.lua

@@ -1190,6 +1190,11 @@ function _M.setnx(self, key, val, opts)
         success[1].request_put = {}
         success[1].request_put.key = key
 
+        local err
+        val, err = serialize_grpc_value(self.serializer.serialize, val)
+        if not val then
+            return nil, "failed to encode val: " .. err
+        end
         success[1].request_put.value = val
     else
         compare[1] = {}

t/v3/grpc/txn.t

@@ -129,7 +129,7 @@ checked val as expect: abc
 --- config
     location /t {
         content_by_lua_block {
-            local etcd, err = require "resty.etcd" .new({protocol = "v3"})
+            local etcd, err = require "resty.etcd" .new({protocol = "v3", use_grpc = true})
             check_res(etcd, err)
 
             local res, err = etcd:delete("/setnx")
@@ -182,7 +182,7 @@ checked val as expect: aaa
                 end
             end
 
-            local etcd, err = require "resty.etcd" .new({protocol = "v3", use_grpc = false})
+            local etcd, err = require "resty.etcd" .new({protocol = "v3", use_grpc = true})
             check_res(etcd, err)
 
             local res, err = etcd:set("/test", {k = "abc"})