nealrichardson commented on PR #13786:
URL: https://github.com/apache/arrow/pull/13786#issuecomment-1231853241
Haven't looked at the PR lately but, as I understand it, `expand_across()`
takes a list of quosures and returns a list of quosures. So you should be able
to unit-test all of its behavior in isolation, and then you want one or two
tests in `mutate()` that it does the right thing in practice (integration
tests). Of course, doing everything in `mutate()` has its conveniences; you
could make it easier to write the unit tests with a test helper, something like:
```
expect_across_equal <- function(actual, expected) {
expect_identical(expand_across(actual), expected)
}
expect_across_equal(
quos(lgl, across(is.numeric, ~ . * 5)),
quos(lgl, int * 5, dbl * 5)
)
```
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