Unit tests that expect message strings having escaped quotation marks are failing on Ubuntu 18.04 (R version 4.0.3, testthat 3.0.0).
Example:
```
── Failure (test-aggregateThenRank.R:131:3): aggregate-then-rank raises error fo
`challenge %>% aggregateThenRank(FUN = mean, ties.method = "maxx")` threw an error with unexpected message.
Expected match: "'arg' should be one of \"average\", \"first\", \"last\", \"random\", \"max\", \"min\""
Actual message: "'arg' should be one of “average”, “first”, “last”, “random”, “max”, “min”"
```