expect_error() takes warnings for errors in edition 3 if the class matches

[DanChaltiel]

Hi,

If you have a function that throws a warning with a class, it seems that expect_error() will accept the output if the class matches.

Not sure if I'm really clear here, an example will speak for itself. The last test is accepted although foo() throws only a warning.

Moreover, it seems that it only affects edition 3.

foo = function() rlang::warn("foo", class="bar")
testthat::expect_error(foo())
#> Warning: foo
#> Error: `foo()` did not throw an error.
testthat::expect_error(foo(), class="bar")
#> Warning: foo
#> Error: `foo()` did not throw an error.
testthat::local_edition(3)
testthat::expect_error(foo())
#> Warning: foo
#> Error: `foo()` did not throw the expected error.
testthat::expect_error(foo(), class="bar")

^{Created on 2022-08-15 by the reprex package (v2.0.1)}

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