testthat (version 2.2.1)

expect_null: Expectation: is an object NULL?

Description

This is a special case because NULL is a singleton so it's possible check for it either with expect_equal(x, NULL) or expect_type(x, "NULL").

Usage

expect_null(object, info = NULL, label = NULL)

Arguments

object

Object to test.

Supports limited unquoting to make it easier to generate readable failures within a function or for loop. See quasi_label for more details.

info

Extra information to be included in the message. This argument is soft-deprecated and should not be used in new code. Instead see alternatives in quasi_label.

label

Used to customise failure messages. For expert use only.

See Also

Other expectations: comparison-expectations, equality-expectations, expect_length, expect_match, expect_named, inheritance-expectations, logical-expectations, output-expectations

Examples

# NOT RUN {
x <- NULL
y <- 10

expect_null(x)
show_failure(expect_null(y))
# }