regexp = NULL checks for presence of error

`null()` did not throw the expected error.

regexp = string matches for error message

"OK" did not throw the expected error.

message method is called when expecting error

`fb()` threw an unexpected error.
Message: dispatched!
Class:   foobar/rlang_error/error/condition

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testthat documentation built on Jan. 21, 2022, 1:10 a.m.