adding tests for :inet6 socket options

Author: Iago Cavalcante

lib/myxql/client.ex

@@ -47,7 +47,7 @@ defmodule MyXQL.Client do
         ssl_opts: Keyword.get(opts, :ssl_opts, []),
         connect_timeout: Keyword.get(opts, :connect_timeout, @default_timeout),
         handshake_timeout: Keyword.get(opts, :handshake_timeout, @default_timeout),
-        socket_options: @sock_opts ++ (opts[:socket_options] || []),
+        socket_options: (opts[:socket_options] || []) ++ @sock_opts,
         charset: Keyword.get(opts, :charset),
         collation: Keyword.get(opts, :collation),
         enable_cleartext_plugin: Keyword.get(opts, :enable_cleartext_plugin, false)

test/myxql_test.exs

@@ -70,6 +70,14 @@ defmodule MyXQLTest do
       MyXQL.prepare_execute!(conn, "", "SELECT 1, 2, NOW()")
     end
 
+    test "custom socket options with :inet6" do
+      opts = [socket_options: [:inet6]] ++ @opts
+      {:ok, conn} = MyXQL.start_link(opts)
+
+      MyXQL.query!(conn, "SELECT 1, 2, NOW()")
+      MyXQL.prepare_execute!(conn, "", "SELECT 1, 2, NOW()")
+    end
+
     test "after_connect callback" do
       pid = self()
       opts = [after_connect: fn conn -> send(pid, {:connected, conn}) end] ++ @opts