That's up to the individual provincial public health authorities. They determine when testing is done. Different provinces deal with that in different ways. That is one of the asks from us, that there be a consistent national approach in dealing with COVID-19.
If somebody is actually symptomatic, then the provincial health authority, once it is made aware of that, will make the determination if the person must get tested and self-isolate. The agency is deferring to the provincial health authority for that reason.