It should be called in the following format:
<pre>
{{Images testCountry Flag
|Main image=
}}
Edit the page to see the template text.
</noinclude><includeonly>
{| border="01" cellpadding="4" cellspacing="4"! Main image| [[Has image::Image:{{{Main image|}}}| ]] [[File:{{{Main image|}}}|200px]]
|}
</includeonly>