When using ABConvert to run template tests on product pages, users often encounter confusion due to Shopify's limitation: a single product can only be assigned to one template at a time.
The short answer:
The variant template in your test does not need to be assigned to the same product as the original template. It can be any published template within your theme.
For more on how template tests work, refer to our Gitbook documentation:
Shipping Tests - Getting Started