In magento product pages at add to cart input field, it shows either 0 or blank. But QA team wanted it to show 1 as default.
So this is how it was resolved.
Magento admin > System > Catalog > Inventory > Product Stock Options
Find “Minimum Qty Allowed in Shipping Cart‘ and click ‘Add Minimum Qty‘ and add a minimum quantity you want to show as default to the appropriate customer group(s) and then save it. It was ’1′ in my case and assigned to ‘All Groups‘ Customer Group.