testthat (version 0.6)

gives_warning: Expectation: does expression give a warning?

Description

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

Usage

gives_warning(regexp = NULL)
  expect_warning(object, regexp = NULL, info = NULL,
    label = NULL)

Arguments

regexp

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

object

object to test

info

extra information to be included in the message (useful when writing tests in loops).

label

object label. When NULL, computed from deparsed object.

See Also

Other expectations: equals, expect_equal, expect_equivalent, expect_error, expect_false, expect_identical, expect_is, expect_match, expect_message, expect_output, expect_true, is_a, is_equivalent_to, is_false, is_identical_to, is_true, matches, prints_text, shows_message, takes_less_than, throws_error

Examples

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