How do I test script on my website that detects country location?

I have a website that is hosted with Adobe Business Catalyst. I have the following liquid code that checks for country location and redirects the user accordingly:

<script> window.location = 
    {% if globals.visitor.country == 'AU' %}
    "/au"
    {% elsif globals.visitor.country == 'US' %}
        "/us"
    {% elsif globals.visitor.country == 'GB' %}
        "/gb"
    {% else %}
        "/store-unavailable"
     {% endif %}
</script> 

I am located in Australia, so I can only check the country location for Australia. How would I test the script for the other countries?

Thanks