Tests for no errors, no warnings, no messages, no output, no match

[hadley]

Deprecate not() in favour of that approach. General negations add a lot of extra work for little gain

[hadley]

Or just add nothing() sentinel value. Or maybe silent()?

expect_warnings(1 + 2, none())
expect_warnings(1 + 2, silent())
expect_warnings(1 + 2, nothing())

vs.

expect_no_warning(1 + 2)
expect_no_warnings(1 + 2)
expect_warning_none(1 + 2)
expect_warningless(1 + 2)
expect_absense_of_warnings(1 + 2)
dont_expect_warnings(1+ 2)