Wishing you luck with getting an answer. I have heard others say that the letter should be taken to the test. Fingers crossed that it is just a short Canada Post delay.
So I called the IIRC this morning (4am our time). They told me that a test invite was sent on 21st May but since I did not get it they will send a message to the Vancouver office to have another sent. I received an email from Vancouver Office 5 hours later at 9am with the paperwork for the test invite.
Please Update the spreadsheet:
Name: SL Teacher
App sent: August 7th, 2018
App received: August 10th, 2018
AOR: Nov 7th, 2018
In Process: Nov 23rd, 2018
FP Request: Dec 5th, 2018
FP hand delivered to Vancouver office: Dec 18th, 2018
Test Invite Email: May 21st, 2019
Test Date: June 19th, 2019
Thank you.