Fix. Set readfunction for easy object.

src/lceasy.c

@@ -535,7 +535,7 @@ static int lcurl_easy_set_READFUNCTION(lua_State *L){
   lcurl_easy_t *p = lcurl_geteasy(L);
   return lcurl_easy_set_callback(L, p, &p->rd, 
     CURLOPT_READFUNCTION, CURLOPT_READDATA,
-    "read", lcurl_read_callback
+    "read", lcurl_easy_read_callback
   );
 }
 

test/run.lua

@@ -1,3 +1,5 @@
+lunit = require "lunit"
+
 local ok, curl = pcall(require, "lcurl")
 local version if ok then
   version = curl.version()