I think we'd have definitely seen testing going on in swing ridings, party conventions, and high immigration places without a lot of English speakers.
Shit like the Muslim voting guide, ballot harvesting from rooming houses and international students, subtly fucking with ex-pat votes from abroad and maybe running a few tests of the compromised voting software in certain places to see if anyone noticed.
I'd doubt that any tests done in Canada affected the vote in any major way (although I'd be suspicious of Beauce) and that most of the testing was designed for flipping a fairly close, low-turnout election which was what fucked them in the States.
The point of testing in Canada isn't to flip elections, it's to see what can be used to flip elections, what gets noticed, what doesn't, and what will be useful in the future.
What we didn't get riled up about was suppression of bombshell information as it related to a scandal, media bias, vote harvesting, the lack of asking about scandals or policy in debates, skipping the foreign policy debate altogether, and having exceptionally biased moderators.
We were incredibly distracted by a silly scandal like the blackface pictures, as well as racial justice issues.
All of that was used in the US elections. What wasn't was the shit that got noticed like the Muslim voting guide.