Actually, you can apply the university and do the TOEFL test at the same period. It won't affect with each other. As long as you show your scores before the deadline of the registration, you will be accepted by the university. Of course, you have to catch the min entrances scores.
The requirement of CANTest at the u of Ottawa is the average 4.5 of listening and reading, 4.0 for writing.
You need to visit the web site of the u of Ottawa to get more details...