I hope you are well and can assist me.
I had to create a duplicate site to test a new theme. The theme is complicated (classifieds) and I could not just upgrade from the old to the new. Now that I know the new theme works for me I realised that I can just as well map this site with the domain mapping plugin and the domain I have on the old site.
How will this affect my SEO with search engines in the short run? I suppose it will be ok in the long run.