testthat (version 0.3)

gives_warning: Expectation: does expression give a warning?

Description

Expectation: does expression give a warning?

Usage

gives_warning(regexp)

Arguments

regexp

optional regular expression to match. If not specified, just asserts that expression gives some warning.

Details

Needs to match at least one of the warnings produced by the expression.

Examples

expect_that(warning("a"), gives_warning())
expect_that(warning("a"), gives_warning("a"))