Apache Virtual Host Set IP

I have a multi-tenant PHP build that will, in production, resolve each request to a tenant based off a subdomain ie. tenant1.example.com.
In testing I have only needed a single tenant, so set up the domain to resolve to this tenant.
I already have apache setup and working, however tests are still failing as the correct tenant can not be resolved.
Just wondering how exactly to configure or set the ip in circleci apache2 so that I can premeditate and set the ip or domain for the test tenant?
Running php 7.0.7.